How Huck LockBolts Work

Click to download the How Huck LockBolts Work Brochure from Star Fasteners

A Huck® LockBolt® 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 together.

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

Speed: Often installs in Under 2 Seconds
A HuckBolt® can be installed in as little as two seconds due to the short time required to apply the tool to the pin and initiate the installation cycle. HuckBolt’s don’t require costly, certified labour to install. A quick visual inspection is all it takes to ensure a solid joint. Once installed, there are no ongoing maintenance costs, they never need retightening or re-torquing, even in the most vibration-intensive application.

Structural Integrity: Consistent, High Clamp Force
Each HuckBolt performs identically in terms of strength and Clamping force. Unlike other mechanical fasteners which must be installed using torque, which varies with friction, a HuckBolts clamping force is determined by the by the stretching of the bolt and swaging the collar into the locking grooves during installation.

Simplicity: Certified Maintenance-Free Joints

HuckBolts are easy to install and require a minimal amount of training. The Huck system only requires a single trigger press to deliver high, consistent preload. No operator discretion or adjustment required.

Dependable: High Shear, Tensile, Pin Strength
Huck is famous for a high-level of vibration-resistance, creating semi-permanent joints that will perform in extreme conditions for years to come without the issues of weld fatigue.

Clamp Force or Pre–Load:
• In the initial stages of the installation process, the 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 of LockBolts vary 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. The tensile strength of LockBolts is dependent on the shear resistance of the collar material and the number of grooves it fills.

“Available in a wide range of materials and in sizes up to 1-3/8”, 2-piece HuckBolt LockBolts deliver up to 5 times the overall fatigue strength of conventional nuts and bolts. In addition to providing a high level of reliable clamp performance, HuckBolts provide a highly vibration-resistant joining option."

The Huck LockBolt range includes C6L®, C120L®, C50L®, BobTail®, Hucktainer® and Encapsulated Hucktainer® (colour matched to any colour of your choice), Magna-Grip®.

Specialists in the supply of Huck Fasteners, Star Fasteners are proud to be the UK’s largest Huck fastener distributor. Working with a diverse range of end users and distributors from across a number of industries. We are also an accredited Huck tool service and repair centre; expert technical knowledge and a large tool hire fleet complements the service. Any Huck stock item can be coloured to meet customers’ requirements and despatched at short notice from our in-house powder coating facility. 

For more information on our products and services, potential applications, tips, ideas and product news, follow along on our social media platforms Facebook: @starfastenersuk and @starfasteners LinkedIn, Twitter, Instagram.


View as PDF Back