by Subhadeep Datta Subhadeep Datta

A Guide To Why Huck® Bolt Fasteners Are The Best For Your Business

Introduction

One of the challenges in heavy machinery is optimizing machine output and reliable equipment. Working in an industry such as trucking, railroad, mining, construction and manufacturing can be high demand, so it is critical your equipment is safe and can perform at its best in harsh conditions and outdoor environments.

That’s why so many businesses trust Huck® fasteners for their feeders, trucks, truck trailers, buses, railcars, mining screens and other equipment. Backed by over a century of experience creating innovative fastener solutions, Huck® fasteners are precision engineered to provide permanent, vibration-resistant joining solutions for industrial applications.

A clean and safe alternative to welding and a more efficient fastening method compared to standard nuts and bolts, the shear strength of Huck® fasteners makes them reliable in situations where a joint is integral to the durability of your equipment’s structure.

What are the benefits of Huck® fasteners?

Huck® fasteners offer multiple benefits that other fastening methods cannot – they are the tough solution to most fastening problems.

  • Quick and easy installation using simple tools can reduce production time by up to 75%. It also means you don’t need to invest in specialists for installation.

  • The reliability of the fastener means that you don’t need to re-check or replace it, which reduces overall costs to your equipment.

  • Each Huck® bolt and structural rivet has its own characteristics, so there are products available for each unique application and need.

  • Huck® fasteners will not loosen, even under extreme vibration.

  • Welding can pose a potential risk to workers due to random sparks and the safety hazard of spent rods and remnants on the assembly floor. Huck® fasteners offer a safer, cleaner alternative.

  • Once the Huck® fasteners are installed, they can’t be removed without specialist tools.

  • Huck’s fasteners solve the problem of any fasteners or bolts loosening over time by creating a tight fit and local system that can withstand rugged conditions.

  • Minimal training is required for operators installing the fasteners, eliminating the dependency on an operator’s skillset. The need to torque or apply a specified rotation to a threaded fastener has been eliminated and, as such, lessens the degree of skill required to effect proper installation. Unskilled operators with minimal training can quickly achieve consistently high-quality structural connections from first installation.

  • Quality control measures are simple to implement, as operators can easily visually inspect the fastener for the correct locking collar swaging during installation.

  • You will experience less downtime caused by bolt loosening and equipment failure.

  • Equipment performance is directly affected by weight – saving weight in your equipment is essential. Huck® fasteners can help lighten the load by offering a higher strength solution, meaning you can use less fasteners or a smaller diameter Huck®. They also allow for the use of lighter weight aluminum instead of steel in the joining process.

How do Huck fasteners work?

High strength fastening systems are installed with either manual, pneumatic or hydraulic installation equipment, making it user-friendly for operators. Using the most advanced fastening technology to date with a unique lock-bolt design, the strength of the fasteners comes from the shear resistance of the collar material and the number of grooves it fills.

What industries do Huck® fasteners thrive in?

Huck® fasteners thrive in structural applications where the working environment is subject to shock, vibration and dynamic loading. They are relied upon by businesses in many industrial markets including truck, trailer, stock crates, bus, rail, bridge work, automotive, HVAC, green energy (such as wind farms), agriculture, grain silo’s, mining, oil and gas.

Blind Bolt Characteristics

Most blind bolts are designed with a steel pin, a collar, and a sleeve.

There are various characteristics to consider when choosing the right blind bolt. You need to choose the right grip range length and diameter for optimal strength and lasting performance. You usually can find the right blind bolt dimensions by consulting the manufacturer’s range chart. You also have to choose the right material. Most commercial blind bolts are made of steel, but there are alternate materials, such as stainless steel and titanium blind bolts, for specialty applications such as aerospace. Once you select the right blind bolt for the job, you will have an extremely strong and lasting joint.

In addition to being strong, Huck® blind bolts are resistant to vibration. Once installed, they will not work loose over time or weaken under constant shaking. That is why they have become the fastener of choice for airplanes, railway cars, automobiles, factory equipment, mining equipment, ships—any application in which the bond has to maintain a strong connection under ongoing vibration.

Another attractive feature is that blind bolts are tamper-proof. Because they are installed using special equipment and have no screw heads, they can’t be vandalized, making them ideal for use in public transit systems, public restrooms, public buildings, or anywhere vandalism is an issue. The core bolt itself is very hard, which makes it difficult to remove without special equipment from the manufacturer. If you have the right equipment, you can remove a Huck® blind bolt and leave the parent material and the pre-drilled hole undamaged.

A Brief History of Blind Bolts

Wooden planes could no longer meet the needs of aircraft design, so engineers started to design airplanes made of aluminum, a material that was stronger, yet light enough for aircraft design. Initially, these aluminum airplanes were made using solid rivets, which made assembly slow and required two workmen, one on each side of the material being assembled. To address the problem, Jacques Chobert, one of the engineers at Aviation Developments, created a new riveting technology, the Chobert® riveting system, which could be installed from one side by one worker. Installation was still slow because fasteners had to be loaded and installed one at a time, so Aviation Developments created a tool that could hold multiple fasteners, which considerably sped up production.

Since World War II, the blind bolt has evolved to become a mainstay of manufacturing. New materials were adapted, as were new head configurations and designs. New methods were developed to machine the blind bolts so they became virtually invisible when painted. With these improvements, blind bolts became common in making aircraft ailerons and flaps, doors, floors, elevators, and so on. Pneumatic tools also were developed to speed up assembly. Over time, blind bolts were being made to join thin-gauge steel, plastics, fiberglass, and other materials. The automotive and electronics industries standardized Huck® blind fasteners for assembly uses. As new applications in aerospace and transportation emerged, new blind bolts were developed, capable of handling more extreme loads and temperatures. Uniquely designed structural rivets such as the Huck® BOM, Huck® Magnalok, and Huck® Magnabulb were developed for thin sheet materials. Eventually, blind bolts came to be used in place of rivets or bolts because of their ease of installation and superior performance.

Common Applications for Huck® BOM Blind Fasteners

Huck® BOM

The Highest Strength Blind Oversized Fastener Available

Blind bolts are used in almost every industry and application.

Often used as a replacement for welding, Huck® BOM is so strong, one BOM (Blind, Oversized

Mechanically locked) fastener can do the work of up to four conventional fasteners. Its unique push-

and-pull installation design makes it ideal for military vehicles, auto suspensions, rail car assembly,

and much more. BOM’s high fatigue thread form extends the life of any structure. Offering accurate,

easy, quick installation, BOM requires no special training or skills for operators.

The BOM® (Blind, Oversize Mechanically locked) fasteners from Alcoa Fastening Systems are so

strong, one can do the work of up to four ordinary fasteners.

You won’t find a more vibration resistant blind fastener, or one that works harder in so many

different applications. With its unique push-and-pull installation design, the BOM fastening system is

tough enough for military vehicles and equipment, auto suspensions, amusement park rides, rail car

assembly, and automatic storage and retrieval racks of shaft steel construction. Even the most

demanding high-tensile application is no match for the strength of the BOM fastening system.

Quick and Economical to Install and Inspect

Because installing BOM fasteners is so easy, a worker can learn the installation procedure in just 10

minutes, eliminating the need to hire certified welders or specially trained employees. And because

they install from just one side, they can be used in all blind side applications.

Installations are more accurate than other fasteners of the same kind, because the element of

human error is not an issue. In other words, correct installation doesn’t depend on operator skill or

specialized tools. Plus, chances are you can start using BOM fasteners immediately with your current

tools, saving you more money in the long run.

  • Excellent pull-up and high retained clamp

  • High fatigue thread form extends the life of your structure

  • Often used as a replacement for welding

Materials: Steel

Available Sizes: 3/16″,1/4″,5/16″,3/8″,1/2″,5/8″,3/4″

Benefits:

Unmatched installation speed ✓

Low overall installed cost ✓

Vibration resistance ✓

Quiet non-torque tools ✓

No repetitive stress injuries ✓

Eliminates need for secondary operations ✓

No special training or skills required for operators ✓

High strength/diameter ratio:

Can be used in demanding structural applications as an alternative to threaded fasteners or welding. Very high joint tightness when compared to conventional blind fasteners. BOM is extremely difficult to remove, making it resistant to tampering.

  1. When the pin separates near flush, the BOM fastener is installed correctly. The BOM fastener does not require surface preparation, grinding or filling after installation.
  1. The collar is locked to the pin through the “swaging” process, creating a high vibration resistant connection and the highest strength of any blind fastener.
  1. Large bearing area on both sides of the work piece ensures a permanently held, tamper resistant joint.

Installation Tooling

Installation Tools

Tooling Weight and Dimensions

CONCLUSION:

Huck® BOM are used in the fabrication of military equipment, auto suspensions, truck, amusement park rides, and other applications that require a strong, lasting join and vibration resistance fastener is a priority to the application. It’s clear that Huck® plays an important part of the fastener world. They are relied upon by businesses in many industrial markets

Macros Fastening Systems brings quality parts to hard-working businesses and has offered high-quality Huck fasteners for many years. Contact us today on +91 9831045458 to get your queries resolved.

by Subhadeep Datta Subhadeep Datta

The Complete Guide to Blind Sheet Metal Fasteners and Their Benefits

What are Blind Sheet Metal Fasteners?

Blind fasteners are a type of metal fastener. They are also called “blind rivets” or “blind bolts”. These blind metal sheet fasteners are used to join two overlapping sheets of metal.

Huck® Magna-Bulb®

Huck Magna Bulb® blind sheet metal fastener perfect for lower strength or thin sheet joint materials. It gives high Mechanical Performance (Best in class). Very high shear strength and high tensile strength.

  • Seizes the joint with clamp
  • Consists Magna Bulb® – Blind fastener of two pieces, called mandrel and sleeve
    • Mandrel is heat treated, with rolled pull grooves
    • Mandrel contains shear ring to bulb sleeve
    • Sleeve material is softer than pin 
    • Sleeve is band annealed to facilitate formation of bulb
  • Installs with special tool
    • Pin lock retains pin
  • Pin breaks flush with head of sleeve

Preparation

  • Insert mandrel and sleeve into hole
  • Insert mandrel into nose assembly
  • Jaws ratchet over mandrel until insert contacts the sleeve

Installation

When trigger is engaged:

  • Jaws pull mandrel
  • Mandrel draws through sleeve, beginning to form bulb on backside
  • Bulb forms, providing bearing area
  • Shear ring breaks free and presses on catch grooves
  • Mandrel shoulder hits sleeve lock and forces material into pin lock pocket

Tool ejection

  • Jaws continue pulling
  • Mandrel breaks at breakneck
  • When trigger is released, nose assembly frees from sleeve

Use in applications that require:

  • High shear strength
  • High tensile strength
  • Consistent clamp (compared to other blind fasteners)
  • Loosening resistance in vibration situations
  • Broad blind side bearing surface
  • High pullout strength, esp. with mis-aligned, oversized or out of round holes
  • Pull through resistance on thin materials
  • Back side clearance
  • Flush pin break

Refer to current industries

  • General manufacturing
  • High vibration applications
    • Commercial truck body assembly
    • Seat track
    • Engine enclosures

Special features against blind fasteners for metal

Extra large blind side footprint: Ideal for lower strength or thin sheet joint materials


Structural fastener: It provides high tensile strength and very high shear strength 

Flush pinbreak: The blind side of fasteners are free from catching on clothes, skin or goods. No special tool required for checking the installation but it gives Quick and easy visual inspection


Internal pin locking mechanism: Secure within the rivet body and protected from corrosion


Headstyles: Protruding


Materials: Steel

A Unique Bulbing Fastener with High Shear Strength

Huck Magna-Bulb® is a unique, clamp-type blind fastener offering high shear strength in specific applications. Its bulbing action during installation spreads the load over more surface area. Post installation, this blind fastener supplies stronger, longer-lasting connection. Thus Magna Bulb® blind fastener offers superior blind side strength. 

This increased bearing area makes Magna-Bulb-blind fastener ideal for pullout resistance in thin materials, and oversized or misaligned holes. Positive, mechanical pin-retention ensures structural integrity no matter what the application.

Secure, Fast Installation

  1. Shear ring design promotes bulb formation and grip adjustment for flush break throughout the grip range
  2. The wide blind footprint (bulb) gives the fastener a broader bearing surface, spreading the load out for greater strength and high pull out resistance 
  3. Unique solid circle lock ensures maximum strength and resistance to vibration 
  4. Breaking flush throughout the entire grip range, the Magna-Bulb fastener eliminates costly cosmetic finish work. Simple visual inspection ensures that the fastener is installed correctly.

Installation Sequence

Application picture (where there is no access in blind side)

Tools for Magna Bulb® – Blind fasteners installation:

by Subhadeep Datta Subhadeep Datta

How Does A Huck Bolt Machine Work

Huck® Bobtail

The Next Step In Lockbolt Evolution

Designed to overcome inherent weaknesses with standard lockbolts, the BobTail has no pin-tail and as a result of this zero pin-break, no waste material to collect and dispose of or potential corrosion issues post-installation. The lightweight, low-noise, low-maintenance Huck tool, which can be used for both installing and removing fasteners, provides a smooth, shock-free, speedy installation sequence i.e. two seconds for a 16mm diameter fastener – twice as fast as any other large diameter lockbolt. As a result, no torque or impact is transferred to the operator.

Benefits of Using Bobtail®

  • Unmatched installation speed
  • High fatigue strength thread form
  • maintenance-free
  • consistent clamp
  • installation indicator on collar for visual inspection
  • low installation noise & no waste
  • easy to learn, shock-free installation
  • unique helical lock groove

Huck Bobtail® Next Step In Lockbolt Evolution

The Huck BobTail system includes Lock Bolts and installation tooling that will deliver you benefits beyond anything that Howmet Fastening Systems has produced before.

Cycle Installation Speed of fastener has to be seen to be believed with the 1/4 diameter BobTail fastener installing in less than 1 second. The 16mm diameter BobTail fastener installs in 2 seconds, up to twice as fast as any large diameter LockBolt on the market.

Combined with all the benefits of using a Huck LockBolt Permanent, mechanically locked fastener: Installation process automatically provides fastener values No torque or re-torque required Unlike conventional nuts and bolts, they will never loosen, even during extreme vibration Easy visual inspection ensures correct installation

How Bobtail Works

Clamp Force or Pre–Load:

In the initial stages of the installation process, the tool engages and pulls on the tail of the fastener. The joint is pulled together before the anvil portion of the nose assembly is forced down the collar. This progressively locks (swages) it into the grooves of the harder pin. The pin and swaged collar combine to form the installed fastener. The squeezing action reduces the diameter of the collar, increasing its length. This in turn stretches the pin, generating a clamping force over the joint. The shear strength of BobTail fasteners varies according to the material strength and minimum diameter of the fastener. By increasing the diameter or the grade of material, the shear strength of the fastener can be increased. The tensile strength of BobTail Huck bolt fasteners is dependent on the shear resistance of the collar material and the number of grooves it fills.

Installation sequence

  • Pin placed into the prepared hole
  • Collar placed over the pin
  • The tool is placed onto the annular pull grooves and activated
  • A puller in the nose assembly draws the pin into the tool
  • Pin head pulled against material
  • Anvil pushes collar against joint
  • Initial clamp generated
  • Tool swages collar, increasing clamp
  • Swaging of the collar into the pin lock grooves is complete, tool ejects the fastener and releases the puller, installation complete

Huck®, Camloc®, Marson®, Recoil® is a brand owned by Howmet Fastening Systems (erstwhile Arconic Fastening Systems) , a leading designer and manufacturer of high-performance, proprietary fasteners and fastener installation systems.

Macros Fastening Systems is proud to be the only authorized distributor of Huck® Fasteners – Huckbolts®, Blind rivets, Huck® tooling, Recoil® inserts & installation tooling, Camloc® latches and SNEP nuts in India

by Subhadeep Datta Subhadeep Datta

How to Install Huck Bolts Using a Huck Bolt Installation Tool


What Are Huck® Lockbolts?

A Lock Bolt is a two-piece fastener that consists of a hardened metal pin and a metal collar that swages into the grooves of the pin, forming a specific, measured clamp force to hold assembled parts.

The Huck® installation tool grips the pintail of a Lock Bolt and then pulls to close the gaps in the materials being joined. Inside the nose assembly, a hardened steel conical-shaped anvil is then forced down the collar to progressively squeeze, or swage, the collar material into the grooves. 

This direct metal-to-metal contact of the collar swaged into the grooves of the pin eliminates the loosening effects of transverse vibration.

  • Often installs in Under 2 Seconds
  • Consistent, High Clamp Force
  • Certified Maintenance-Free Joints
  • High Shear, Tensile, Pin Strength

Some of our best Huck® Lockbolts to provide strength to your machinery.

C6L ® The Original Vibration-Resistant Huck Bolt®

A result of Huck International innovation a half-century ago, the versatile C6L® Huck Bolt® remains the number one fastening system for applications that require a strong, vibration-resistant seal today.

C6L’s exclusive locking groove design ensures a permanent fit that resists loosening. That means it’s ideal for applications from general manufacturing to such high-vibration applications as HVAC, trailer and container assembly, rotary and rotating equipment, shopping carts, railroad, and transit cars, geodesic structures, and many others.

In addition to offering superior fastening performance, the C6L system reduces labor and installation costs, along with rework and warranty expenses. Using the C6L eliminates the need to hire certified welders or specially trained employees because workers can be instructed to install these foolproof fasteners in a matter of minutes. The C6L is simply stronger, easier to install, and more durable than welding, adhesives, or conventional threaded fastening systems. The C6L is available in Grade 2, Grade 5, and Grade 8.

Available Sizes: 3/16”, 1/4”, 5/16”, 3/8”

Materials: Steel, Aluminum, Stainless Steel

Head styles: Round, Truss, Flush, 98T

The C6L’s unique design virtually eliminates installation errors caused by operator or tool variables. The C6L ensures that once the collar swage is complete, the pintail breaks off and the fastener is tightly installed. No rework is required. You can count on consistent, highly-uniform clamp force with every C6L installation, time after time.

1 Wide bearing collar and head spread the load to ensure structural integrity.

2 Initial long length of fastener enables pull-out of large gaps.

3 Excellent gap pull-out and high retained clamp.

4 High-fatigue, annular lock groove form extends the life of your structure.

Huck® C50L® The Fastener That Has Defined Huck Bolts for More Than 50 years

The C50L® offers superior vibration resistance and overall durability for heavy-duty fastening jobs and is ideal for use within applications where consistent, uniform high clamp force is required. Testing has proven that C50L fasteners meet, or exceed the performance of torqued bolts in both shear and tensile strength, as well as fatigue life. For heavy-duty applications ranging from railcar to mining equipment manufacturing, the C50L delivers superior vibration resistance and overall durability.

Available Sizes: 1/2”, 5/8”, 3/4”, 7/8”, 1”, 1-1/8”, 1-3/8”

Materials: Steel, Aluminum

Head styles: Round, Truss, Large Truss, 90° Flush, Thread Head

Unlike threaded fasteners, the C50L HuckBolt® delivers consistent installation results. High costs of calibrating, maintaining, and replacing tools are eliminated. Also, installation does not require expensive, highly experienced workers.

1 Swaged-on collar forms a permanent, vibration-proof connection.

2 Initial long length of fastener enables pull-out of large gaps.

3 Consistent, repeatable pre-load

How Do Huck® Bolts Work?

Clamp Force or Pre-Load

In the initial stages of the installation process, the Huck® lock bolt tool engages and pulls on the pintail. The joint is pulled together before the conical-shaped cavity of the nose assembly is forced down the collar. This progressively locks (swages) it into the grooves of the harder pin. The pin and swaged collar combine to form the installed fastener. The squeezing action reduces the diameter of the collar, increasing its length. This in turn stretches the pin, generating a clamp force over the joint.

Shear strength

Varies according to the material strength and minimal diameter of the fastener. By increasing the diameter or the grade of material, the shear strength of the fastener can be increased.

Tensile strength

The tensile strength of Lock Bolts is dependent on the shear resistance of the collar material and the number of grooves it fills.

Lock Bolt Installation

Installing Huck® Bolts Using Huck Bolt Installation Tools.

  1. Before installation, you need to make sure that you have the right size of Huck® bolts for the process. You would want to go for one that has the right size and strength for your needs.

  1. Put the Huck® bolt in the hole prepared for it. Try to make sure that the bolt is the right fit for the application, or there are chances of lateral movement. This movement can weaken the joint over time.

  1. When you place the Huck® bolt in the cavity, the collar will be over the pinhead. When you use a Huck® lockbolt installation tool for the process, the reliable collar will form a durable connection that lasts for years.

  1. We have many different kinds of hydraulic machines that can help with your installation process. We have hydraulic and pneudraulic powered Huck® bolting machines that effectively help you install Huck® bolts in seconds. A few of our best products are the Swage forward Range and Huck® Range Force Battery Installation Tool.

  1. From the wide range of tools available, try to choose the perfect match for your needs. Put the machine’s nosepiece into the collar, over the pintail. Activate the Huck® bolt tooling.

  1. The activation process will put pressure on the collar and brings the pieces of the bolt together. It ensures a sturdy design that cannot become loose over time.

  1. Once the process is complete, the tool breaks from the pintail, and you can remove the machine.