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Different Types Of Bolts


The humble bolt stands tall as the unsung hero holding our world together. In this insightful article, expertise meets clarity as we unravel the diverse types that make up this essential hardware. Discussions will dive into common bolts, highly specialized ones, and their unique properties. So keep reading to unlock the marvels of these fastening wonders!


The Basics of Bolts

Navigating through the world of construction and assembly, understanding the basics of bolts is crucial. Bolts are fundamental components that secure materials together across various applications.



inguishing Bolts from Screws: A Clear Definition


Key Differences


Bolts pair with nuts for fastening. Screws embed directly into materials. This primary difference influences their application.


Selection Criteria


Choosing between them depends on the project's needs. Bolts provide a strong hold for heavy materials. Screws are suited for tighter, interior connections.


Application Insights


Understanding these differences ensures the right fastener is selected, optimizing the integrity and strength of assemblies.


Anatomy of a Bolt: Head, Shank, Thread, and Nut




A bolt consists of a head, shank, thread, and requires a nut. Each part plays a role in securing materials.




The head applies pressure; the shank offers alignment. Threads engage with the nut, creating a secure connection.




Together, these components provide a robust solution for joining materials, ensuring durability and reliability.


The Role of Nuts in Bolting Solutions


Nuts as Counterparts


Nuts complete the bolting action. They tighten against the bolt, clamping materials together.


Selection Importance


Choosing the correct nut ensures the bolt maintains its hold, preventing loosening over time.




A properly matched nut and bolt create a secure fastening that withstands external stresses.


Material and Grade Specifications for Bolts and Nuts


Material Choices


Bolts and nuts are made from various materials, including steel and aluminum, tailored to specific environments.


Grade Significance


Grades denote tensile strength. Higher grades offer greater strength for critical applications.




Selecting the right material and grade is key for the bolted connection's success and longevity.


The Role of Nuts and Washers in Bolted Connections


Combining Forces


Nuts and washers distribute load, preventing surface damage and ensuring a tighter join.


Washers' Importance


Washers protect surfaces and help maintain tension, crucial in dynamic environments.


Stability and Reliability


Together, nuts and washers enhance the bolt's effectiveness, providing stability and reliability in connections.

Understanding these fundamentals of bolts lays the groundwork for successful construction and assembly projects, ensuring secure, durable connections that stand the test of time.


Detailed Guide on Bolt Types and Their Applications


Anchor Bolts

Exploring the realm of fastening solutions, the anchor bolt emerges as a pivotal component in construction and assembly. Understanding the anchor bolt's design, applications, and installation can significantly enhance the effectiveness of structural projects.

Description and Visual Representation

Design Overview

An anchor bolt is designed to attach objects to concrete. It's characterized by its L or J-shaped end, which anchors into concrete, providing a strong hold.

Visual Elements

Visual representations often depict anchor bolts with a threaded end protruding from concrete, ready for nuts and washers. The bent end inside concrete ensures stability.


Various types of anchor bolts exist, including wedge anchors, sleeve anchors, and drop-in anchors. Each serves specific anchoring needs.

Key Characteristics and Applications


Anchor bolts are made from sturdy materials like stainless steel or carbon steel, offering durability and strength. They withstand heavy loads and harsh environmental conditions.


They’re widely used in building foundations, attaching beams to concrete, and securing light poles, among others. Their versatility makes them essential in construction.


Anchor bolts provide reliable fastening in critical structural components, ensuring safety and structural integrity.

Installation Techniques and Tips


Installation begins with drilling a hole in the concrete. The diameter and depth must match the anchor bolt's specifications for optimal hold.

Setting the Anchor

The anchor bolt is then inserted into the hole. For some types, a hammer is used to expand the anchor within the concrete, securing it in place.

Final Steps

After setting, the protruding threaded end is ready for a nut and washer. Tightening the nut completes the installation, firmly attaching the fixture to the concrete.

Arbor Bolts


Arbor Bolts

Diving into the myriad types of bolts unveils the specialized arbor bolt, a crucial component in the world of power tools. This section provides an intricate look at arbor bolts, highlighting their design, significance, and applications.

Detailed Description with Images

Design Overview

Arbor bolts feature a unique design tailored for secure attachment in power tools. They typically possess a non-circular head that requires a matching tool for installation and removal.

Visual Aid

Images of arbor bolts often showcase their distinguishing flat or washer-like head with a centered hole, designed to fit precisely on tool arbors.

Material Construction

Constructed from high-strength steel, arbor bolts endure the stresses of high-speed tool operations, ensuring longevity and reliability.

Unique Features and Its Necessity in Power Tools

Key Features

The standout feature of arbor bolts is their ability to lock securely onto a tool's arbor, preventing the bolt from loosening during operation. This locking mechanism is vital for operator safety.

Necessity in Power Tools

In power tools like circular saws or grinders, arbor bolts maintain the attachment of cutting blades or disks. Their reliable hold prevents wobbling or detachment at high speeds.

Safety Aspect

By ensuring a secure fit, arbor bolts significantly reduce the risk of accidents, making them indispensable in power tool design and usage.

Practical Use Cases and Selection Criteria

Common Applications

Arbor bolts are common in the assembly of saw blades on woodworking and metalworking power tools. They're also found in lawn mowers for securing cutting decks.

Choosing the Right Arbor Bolt

Selecting the correct arbor bolt involves matching the bolt's size and thread pattern to the tool's specifications. The material of the bolt should also be considered, ensuring it can handle the tool's operational demands.

Maintenance Tips

Regular inspection of arbor bolts for wear and proper tightness is recommended. Replacing worn or damaged bolts is crucial to maintaining tool performance and safety.


Hex Head Cap Screws

Hex head cap screws are a staple in the fastening world. They follow ANSI/ASME standards for dimensions. This means they fit universally. They come in various sizes. Their external threads grip into materials. This creates a secure connection.

Let's talk about the materials. Most hex head cap screws are made of carbon steel. This includes grades 2, 5, and 8. Grade 2 is made of low carbon steel. It's great for non-critical applications because it's economical. Grade 5 screws undergo quench and temper heat treatment. They are stronger. Grade 8, made of medium-carbon alloy steel, has the highest strength. It's for high stress applications.

These screws have wide applications across industries. For example, Grade 2 screws are used in construction for non-structural joints. Grade 5 screws are common in automotive repair and industrial use. Grade 8 screws are used in agricultural plows, bulldozers, and snow plows. This is due to their high tensile strength and resistance to extreme temperatures.

Finishes are important too. Zinc plated screws resist corrosion. This makes them suitable for coastal environments. Galvanized screws offer even better corrosion resistance. They are perfect for corrosive environments.

ASTM material standards like A307A for low carbon steel and A354 GR BD for alloy steel ensure quality. These standards cover heat treatment and mechanical properties. This ensures the screws perform well under stress.

For specific uses, 18.8 and 316 stainless steel screws are best. They resist corrosion. This makes them ideal for pharmaceutical equipment and use in a marine environment.


Stainless Steel Cap Screws

Stainless Steel Cap Screws

When we talk about stainless steel cap screws, two types often come up: 18.8 and 316 stainless steel. Both are used widely, but they have key differences. Let's break them down.


18.8 Stainless Steel

18.8 stainless steel is a common choice. It's made mainly from 18% chromium and 8% nickel. This mix gives it good corrosion resistance. It works well in many environments. But, it's not the best in places with high chloride levels, like coastal areas.


316 Stainless Steel

On the other hand, 316 stainless steel has an extra element: molybdenum. This boosts its corrosion resistance even more. It's the go-to for aggressive environments. Think marine environment or places with lots of chemicals, like pharmaceutical equipment.


Common Uses

Both types are used where corrosion resistance is key. But, 316's extra protection makes it better for harsher conditions. You'll find 18.8 screws in automotive repair or industrial use. They're great for non-critical applications due to their economical use.

316 shines in places like coastal environments or with pharmaceutical equipment. Its ability to stand up to corrosive environments makes it invaluable. It's a bit more expensive. But, its durability in tough spots justifies the cost.


Why It Matters

Choosing the right stainless steel cap screw is crucial. It ensures your mechanical device or project lasts longer. It also prevents extra costs from replacements. Whether it's an oversize hole in a sheet metal application or securing parts in a marine environment, the right choice makes all the difference.

Carriage Bolts


Carriage Bolts


Design Features and Distinguishing Factors


Carriage bolts are distinct in their design.

They feature a smooth, rounded head on one end.

They have a short cylindrical neck, called the short neck variety.An alternative version is the ribbed neck carriage bolt.

It has a ribbed neck instead of a smooth short neck.

The ribbed neck increases purchase or gripping power.Both varieties have a flat countersunk head.

This head design allows the bolt to sit flush with the surface.

It creates a smooth finish when installed properly.


Usage in Sheet Metal and Soft Materials


Carriage bolts excel at fastening sheet metal and soft materials.

The rounded head prevents gouging or denting the thin surface.

The square shoulder beneath the head bears against the material.This distributes clamping force evenly over a wide area.

It reduces the chance of the bolt pulling through the material.

Short neck varieties work well for thin sheet metal applications.Ribbed neck bolts provide more gripping power in soft materials.

The ribs dig into wood, plastic, or other porous surfaces. This extra purchase prevents the bolt from spinning loose.Common uses include:

Securing sheet metal panels and brackets

Attaching wooden trim or furniture components

Joining plastic housings and casings

Fastening machinery guards or covers

Galvanized carriage bolts resist corrosion in exterior applications.

This makes them suitable for outdoor furniture and equipment.Oversized holes accommodate some misalignment during assembly.

The large round head covers gaps for a clean installation.


Hex Head Tap Bolts


Characteristics of Galvanized Hex Head Machine Bolts

Hex head machine bolts are versatile fasteners.

They feature a hexagonal head for wrenching.

The shaft has a uniform threading along its length.These bolts are commonly made from low or medium carbon steel.

Galvanized coatings protect against corrosion in many environments.

Zinc plating provides enhanced rust resistance.Machine bolts come partially or fully threaded.

Partially threaded bolts work well for joining materials.

Fully threaded shafts suit use with nuts and tapped holes.Common applications include automotive repair and industrial machinery assembly.

The hex head allows firm tightening with wrenches or sockets.


Applications of A307, Grade 5, and Grade 8 Tap Bolts


Tap bolts have tight tolerances and fully threaded shanks.

This allows them to develop full thread engagement in tapped holes.

ASTM A307 low-carbon tap bolts work for non-critical applications.Grade 5 medium-carbon tap bolts provide higher strength.

They are suitable for demanding industrial and equipment uses.

Grade 8 alloy tap bolts offer the highest strength ratings.Grade 8 bolts handle high stress and extreme temperatures.

Their greater toughness suits heavy equipment like bulldozers and plows.

A325 structural bolts also utilize high-strength tap bolt designs.


Stainless Steel Tap Bolts for Corrosive Environments


For highly corrosive settings, stainless steel tap bolts are preferable.

Type 18-8 stainless resists moisture, chemicals, and saltwater.

Type 316 stainless steel has enhanced corrosion resistance.These bolt grades prevent rust in marine and coastal environments.

Pharmaceutical and food equipment often requires stainless hardware.

Stronger alloys like 17-4 PH stainless work for high-stress applications.Stainless tap bolts ensure lasting, maintenance-free connections.

Their corrosion resistance eliminates replacement due to environmental attack. This provides economic benefits over standard carbon steel options.

heavy hex structural bolts


Heavy Hex Structural Bolts


Differences between ASTM A325 and ASTM A490


ASTM A325 and A490 are specifications for heavy hex structural bolts. They define material properties and performance requirements for these critical fasteners.

ASTM A325 bolts are made from medium-carbon steel with additional alloys. They undergo quenching and tempering heat treatment for enhanced strength. A325 bolts have a minimum tensile strength of 120 ksi.

ASTM A490 bolts use an atmospheric corrosion-resistant low-alloy steel. The material is air-cooled from a higher heat treatment temperature. A490 bolts achieve even higher minimum tensile strengths of 150 ksi.

A325 structural bolts are black or plain finished. A490 bolts have a weathering steel chemistry for atmospheric corrosion resistance.

Both types utilize heavy thick hex heads for external wrenching installation.


Specific Applications in Structural Steel Joints


Heavy structural bolts primarily join heavy steel sections and components. A325 and A490 specifications support critical structural connections and joints.

Typical applications outlined by AISC (American Institute of Steel Construction) include:

Connecting columns, beams, girders, and trusses in buildings

Splicing girder and beam sections during fabrication

Securing base plates, gusset plates, and joint framing members

Anchoring machinery bases and equipment mounts requiring structural integrity

ASTM A325 bolts suit most typical structural steel connections. However, ASTM A490 high-strength bolts provide increased load capacity. A490 bolts allow reducing fastener counts or downsizing diameters.

These benefits yield potential material cost savings and construction efficiencies. However, A490 fasteners command a higher price than standard A325 bolts.

Both heavy hex structural bolt types provide reliable steel connections. They accommodate today's optimized designs for economic fabrication and erection.


Blind Bolts

Blind Bolts


Anatomy of a Blind Bolt Explained


A blind bolt consists of several components. It has a flat head at one end. The shaft is partially threaded and hollow.

Inside is a cone-shaped sleeve called the blind bolt sleeve. A toothed mandrel or pull stem runs through the sleeve. At the back end is a tail piece.

During installation, the mandrel pulls the sleeve into the bolt shaft. This expands the sleeve against the opposite surface. The head clamps the front face, creating a secure blind-side connection.


Advantages Over Traditional Rivets and Hex Bolts


Blind bolts offer significant advantages over standard fasteners. They provide strong clamping force like a traditional bolt. However, they only require access from one side during installation.

This allows joining materials in confined or inaccessible spaces. Blind bolts eliminate the need to hold a nut on the back side. They install quickly with a hand or power tool.

Compared to rivets, blind bolts create tighter, more reliable joints. They can be easily removed and reused if needed. Rivets require drilling out for disassembly, damaging materials.


Comprehensive Guide on Applications and Installations


Blind bolts find wide use in construction and manufacturing. They attach wall panels, machinery guards, and ductwork. Automotive applications include seat assembly and under-body components.

Aluminum blind bolts suit aircraft and marine installations. Stainless steel versions resist corrosion in harsh environments. Larger structural blind bolts secure heavy equipment and structures.

For proper installation, drill or punch the correct hole size. The bolt length must match the total material thickness. Apply the recommended tool and spin speed for the blind bolt type.

Once installed, the sleeve expands to fill the vacant space. The serrated mandrel spins off, leaving only the secured blind bolt. Crimped sleeves indicate correct expansion and tensile load.

Elevator Bolts 

Elevator Bolts


Detailed Illustration and Description


Elevator bolts have a distinct U-shaped head design.

The curved head forms a continuous hook shape. The shank extends from one end of the hook.The threaded end allows a nut to secure elevator bolts. Some versions feature fully threaded shanks for additional grip. The hook head provides a secure mounting point.

Elevator bolt heads may be open or closed. Open hook heads allow lateral installation into holes. Closed hook heads require insertion through an open end.

These bolts are commonly made from low or medium carbon steel. Galvanized and stainless steel options increase corrosion resistance.


Installation Procedures and Where It Fits Best


Elevator bolts install easily into pre-drilled holes or brackets. The open hook slides laterally into the mounting hole. A nut threaded onto the bolt shank secures it.

For closed hook elevator bolts, first pass the shank through the bracket. Then rotate the hook head to lay flat against the surface. Threading on a nut locks the bolt in position.

These bolts excel at joining rails, guides, and support beams. The hooked head catches the edge of structural components. This creates a secure anchor point with high clamping force.

Elevator bolts also attach guide rails, equipment bases, and machinery frames. Any application requiring a removable yet sturdy anchor point benefits.


Industries and Applications Benefitting from Elevator Bolts


Elevator bolts find widespread use in their namesake industry. They secure guide rails, cab interiors, and counterweight components. The hooked head easily installs through narrow spaces.

Manufacturing facilities utilize elevator bolts for equipment installation. Anchoring machine tool bases, guards, and fixtures is common. The hook design allows quick bolt positioning and replacement.

Other applications include material handling systems like conveyor frames. Crane rail fastening also takes advantage of elevator bolt geometry. Any structural steel assembly with hard-to-reach anchor points suits these bolts.

Theatrical rigging for sets and lighting utilizes elevator bolt versatility. Their strength and secure mounting make them stage production staples. Quick no-spin installations also benefit maintenance and construction work.

eye bolts 

Eye Bolts


Overview and Visual Examples


Eye bolts feature a circular ring or loop at one end.

This eye design allows attaching cables, chains, or hooks. The opposite end has a threaded shank for securing with a nut.Common eye bolt shapes include:

Straight eye - Ring aligns with the bolt shank

Angle eye - Ring forms a 90° angle with the shank

Shoulder eye - Shoulder separates the ring from the threads

Rectangular eye - Oblong ring shape for increased strength

Eye bolts come in various materials like steel, stainless steel, and alloys.

They may have additional coatings like zinc plating or hot-dip galvanizing.


Different Types of Eyebolts and Their Uses


Straight Eye Bolts: Simplest design used for direct pull applications. Common for utility lines, signs, shelving, and rigging setups.

Angle Eye Bolts: 90° angle aids side loading and lateral pull. Useful for trucking tie-downs, equipment lifting, and sporting equipment anchors.

Shoulder Eye Bolts: Shoulder separates load from threads for enhanced strength. Suitable for heavy lifting, construction rigging, and machinery moving.

Swivel Eye Bolts: Ring freely rotates to allow infinite pivot/swivel. Ideal for sailing rigging, suspension lines, and pivot connections.


Safety Tips and Load Guidelines


Always inspect eye bolts before use for damage or excessive wear. Replace any bolts that appear stretched, corroded, or cracked.

Never exceed the working load limit (WLL) rating for the size. Load only along the bolt's intended pull direction to avoid side loading.

Use appropriate hardware like washers and lock nuts for security. Apply thread-locking compounds for critical load-bearing applications.

When calculating total weight, account for potential shock loads and angles. Proper eye bolt sizing ensures a suitable safety factor.

Flange Bolts

Flange Bolts


Understanding the Design and Utility


Flange bolts have an integrated wide flange under the head. This flange provides a larger bearing surface compared to standard bolts. It distributes clamping force over a wider area.

The flange shape prevents the bolt head from digging into surfaces. It allows for even load distribution without damaging materials. Flange bolts securely clamp thinner materials like sheet metal.

Under the flange, the bolt has partial or full machine threads. Some versions have serrated flanges for increased grip. Flange bolts require a clearance hole slightly larger than the shank.


Application Areas and Installation Guide


Flange bolts excel at joining sheet metal, plastics, or wood. The wide flange prevents crushing or pullout in soft materials. They secure machine guards, covers, and equipment panels.

Automotive uses include body panel assembly and trim attachment. Flange bolts also install electrical boxes, fixtures, and signs.

To install, drill the recommended hole size for shank clearance. Insert the flange bolt through the material and component being joined. Thread on the matching nut and tighten to the specified torque.

For thru-holes, use a flange nut on the opposite face. This provides even clamping force against the back surface.


Selecting the Right Flange Bolt for Your Project


Consider the material thickness and compressive strength when choosing flange bolts. Thicker flanges provide more bearing area for heavy-duty applications. Standard steel flange bolts suit most industrial and equipment needs.

Stainless steel flange bolts resist corrosion for outdoor or marine use. Galvanized zinc coatings also increase rust resistance in wet environments.

Always match bolt length to the total thickness being clamped. Ensure the threads extend through for proper nut engagement.

Flange bolt diameters should provide sufficient tensile area. Oversizing prevents stripping or shearing under heavy working loads. Grade markings indicate the bolt material strength and hardness.


J Bolts

J Bolts


Detailed Description with Images


J bolts get their name from their distinctive J-shaped design. One end has a circular bend forming the hook or "J" shape. The opposite end features straight threads for attaching a nut.

The hook allows securing the bolt by catching onto edges or lips. The threaded section passes through holes or brackets for fastening. This combination creates a secure anchoring point from one side.

J bolts are typically made from steel with various plating options:

Zinc plating provides basic corrosion protection for mild environments.

Hot-dip galvanizing increases rust resistance for outdoor applications.

Stainless steel is highly corrosion-resistant for harsh or marine conditions.


Its Role in Construction and Anchoring


J bolts excel at anchoring applications across many industries. In construction, they secure concrete anchors and foundation embeds. Contractors use J bolts to attach railings, fences, and framing members.

Equipment installation utilizes J bolts for anchoring machine mounts and bases. The one-sided accessibility simplifies installation in tight spaces. Hook ends catch on equipment pads or existing anchor plates.

For marine use, J bolts secure boat lifts, dock attachments, and hardware. The bent hook easily loops over frame members for fastening. Stainless steel versions resist saltwater corrosion in these environments.


Purchasing and Installation Guidelines


When selecting J bolts, match diameters to the expected load ratings. Larger diameters provide greater tensile strength for heavier anchoring. Check that the hook size accommodates your mounting point dimensions.

Standard J bolt lengths range from 3-24 inches in 1-inch increments.

Measuring the required length ensures the J hook clears obstructions. Longer bolts allow passing through thick material stacks.For installation, drill the recommended hole size for shank clearance. Insert the J hook end through the hole or gap first.

Rotate the bolt to catch the hook, then secure with a nut.

Lag Bolts 

Lag Bolts


What Sets Lag Bolts Apart: An Overview with Pictures


Lag bolts are heavy-duty wood screws with an angled, contoured thread. They feature a hex head for wrench tightening and installation.

The angled, coarse threads bite into wood for extremely secure connections. This allows lag bolts to withstand heavy loads and tensile forces.

Unlike standard wood screws, lag bolts get their grip from the threads. The large diameter and partial unthreaded shaft resist spinning.

Lag bolts come in diameters from 1/4" to 1" or larger. Typical lengths range from 1" up to 12" or more.


When and Where to Use Lag Bolts


Lag bolts attach heavy structural members like floor joists and headers. Their pullout resistance secures deck ledgers to homes and buildings. Carpenters use lag bolts for joining large timber construction components.

In industrial and agricultural settings, lag bolts fasten machinery bases. Equipment mounts utilize lag bolt strength where anchoring into concrete isn't feasible. Heavy-duty shop furniture and workbenches employ lag bolt joinery.

Other applications include truck equipment mounting, trailer anchors, and utility poles. Anywhere requiring lag screw strength without accessing both sides suits lags.


Installation Best Practices for Durability and Strength


Always drill a pilot hole for lag bolts before driving them in. The pilot hole prevents wood splitting and stripping the threads. The diameter should closely match the lag bolt's root diameter.

Next, apply soap or beeswax lubricant to the threads before installation. This reduces friction, allowing the lag to cut its own threads.

Use a socket wrench to slowly turn the lag bolt. Applying steady pressure allows the threads to bite securely.

Tighten lag bolts until they're fully set, but avoid overtightening. Overtightening can strip the wood threads or damage the fastener.

For maximum grip, lag bolts require penetrating the main structural member. At least 2/3 of the thread length should engage for proper strength.

Plow Bolts 

Plow Bolts


Plow bolts are crucial for heavy machinery, offering a unique design that includes a flat, domed, or convex head coupled with a tapered neck for a seamless, flush fit. Available in sizes ranging from 0.375 to 1 inch (9.5 mm to 25.4 mm) and commonly found in grades 5 and 8, these bolts are engineered for durability and strength.


Features and Applications


Flush Design: The heads are crafted to lie flush against machinery surfaces, preventing snagging and promoting smoother operations.

Tapered Neck: Ensures a tight, secure fit, reducing the likelihood of bolt movement.

Versatile Applications: Initially used in plow assembly, today's plow bolts fasten various components of construction equipment, enhancing both functionality and aesthetics.

Material Grades: Grade 5 bolts are preferred for general use, while grade 8 is sought after for high-stress applications, offering unmatched strength.


Choosing the Right Plow Bolt


Selecting the perfect plow bolt involves considering head style, material grade, and thread length to match the machinery's demands. Compatibility with equipment design ensures a snug fit, essential for optimum performance and safety.


Tension Control Bolts


The Tension Control Bolting system stands at the forefront of modern structural engineering, having swiftly become the preferred method for tensile strength in construction. This innovative system combines the ASTM A325 TC Bolt, ASTM A194 2-H Heavy Hex Nut, and ASTM F-436 Flat Washer, facilitating a more streamlined, cost-effective approach to steel joint assembly.


Key Components Driving Efficiency


ASTM A325 TC Bolt: Essential for durable steel joints, optimizing load distribution.

ASTM A194 2-H Heavy Hex Nut & ASTM F-436 Flat Washer: These components ensure a secure fit and even pressure distribution, crucial for maintaining structural integrity.

This efficient assembly supports one-operator, single-sided installation, significantly reducing labor requirements and project timelines.


Proven Applications


From towering skyscrapers to expansive bridges, the TC bolting system delivers unmatched reliability. Simplifying construction while ensuring the longevity and safety of these essential structures, TC bolts have become integral to projects demanding uncompromised strength.


Industry Endorsement


Recognized by the American Institute of Steel Construction (AISC) and the Research Council on Structural Connections (RCSC), the Tension Control system is celebrated for revolutionizing structural bolt technology.

Hanger Bolts 

Continuous Thread Studs and Hanger Bolts


B7 Continuous Thread Stud Applications


Continuous thread studs have uniform full threads along their entire length. B7 refers to a specific alloy steel grade for these studs. B7 studs offer enhanced strength compared to milder steel options.

Their fully threaded design allows use with nuts at any position. This makes continuous thread studs highly versatile fastening components. Common applications for B7 studs include:

Securing machine components and equipment bases

Joining structural framework and access platforms

Mounting electrical equipment, boxes, and enclosures

Assembling industrial process piping and valves

Attaching boilers, heat exchangers, and pressure vessels

B7 studs resist extreme temperatures and environmental conditions better than standard steels. Their alloy composition provides corrosion resistance and improved mechanical properties.

For critical service, B7 continuous thread studs ensure reliable load-bearing integrity.


Hanger Bolts for Overhead Applications and Plumbing Fixtures


Hanger bolts feature threads on each end with an unthreaded shoulder. The center shoulder extends through the mounting surface or bracket. One end secures with a nut, while the opposite threaded end supports loads.

These double-ended bolt designs suspend components from above or below surfaces. Common overhead uses include mounting light fixtures, signs, and pipework. For plumbing, hanger bolts secure pipe hangers traversing stud walls.

The shoulder lengths accommodate different material thicknesses being penetrated. Standard shoulder dimensions enable compatibility with standard plumbing components.

Hanger bolts come in steel, stainless steel, and brass material options. Steel versions suit general-purpose dry interior environments. Stainless steel resists moisture and corrosive conditions in bathrooms.

In industrial settings, hanger bolts anchor cable tray runs and ductwork. They provide easily adjustable mounting points for infrastructure.


Selecting the Right Bolt for Your Project

Choosing the appropriate bolt for any project is crucial for ensuring durability, reliability, and safety. Various factors must be taken into account to make an informed decision that aligns with the project's requirements.


Factors to Consider When Choosing a Bolt


Material Resistance


The material of the bolt determines its resistance to corrosion, heat, and wear. Stainless steel is resistant to rust, making it ideal for outdoor applications. Carbon steel bolts offer strength for heavy-duty tasks but may require protective coatings.


Tensile Strength


Tensile strength is the measure of a bolt's resistance to breaking under tension. Higher-grade bolts can handle more stress, essential for structural projects. Consider the load the bolt will bear to select an appropriate grade.


Environmental Considerations


Environmental factors like moisture, temperature, and chemical exposure can affect a bolt's performance. Corrosive environments might necessitate specialized materials like alloy or coated bolts to prevent degradation over time.

Understanding these factors plays a pivotal role in selecting the right bolt for your project. Material resistance ensures the bolt withstands external conditions, tensile strength guarantees it can handle the required load, and considering environmental factors ensures longevity. Combining these considerations directs you toward the most suitable bolt, optimizing the project's success and safety.### Selecting the Right Bolt for Your Project

Identifying the ideal bolt for a specific application involves understanding various factors, including bolt grades, which play a critical role in ensuring the structural integrity and longevity of the assembled pieces.


Bolt Grades and Their Relevance


Understanding the Grade System


Bolt grades indicate the bolt material's strength, with higher numbers representing greater tensile strength. This system helps in determining the right bolt for specific load requirements.


Breaking Down the Grade System


The grade system ranges primarily from 2 to 8 in common bolts, each designed for different applications. For instance, Grade 2 bolts are suitable for light applications, while Grades 5 and 8 are intended for more demanding tasks.


Making the Right Selection


Selecting a bolt with an appropriate grade is crucial for ensuring the bolt can withstand the operational stresses. Considering the project's specific needs aids in choosing the bolt grade that guarantees safety and durability.




Q: What's the difference between a bolt and a screw?

A: Bolts require nuts for fastening. Screws create their own threads. Selection depends on the project's needs.

Q: How do I select the right type of bolt for my project?

A: Consider the load, material compatibility, and environmental exposure. Material and bolt grade are crucial factors.

Q: Can I interchange different types of bolts in applications?

A: Generally, no. Each bolt type serves a specific purpose. Incorrect substitution can lead to failure.

Q: What preventive measures can be taken against bolt corrosion?

A: Use corrosion-resistant materials. Apply protective coatings. Regular maintenance can extend bolt life.

Q: How to prevent bolt loosening in vibrating machinery?

A: Use locking mechanisms like lock nuts. Choose bolts designed for vibration resistance. Regularly check and maintain tightness.


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