Small diameter 6.4mm to large 25mm permanent structural LockBolt

A leading product within the Huck range is the Huck BobTail fastener. It is a two-part fastening system that consists of a pin and a collar. These advanced fasteners are installed using a direct tension technique, in which the pin is pulled and the collar is simultaneously swaged into the locking-grooves of the pin, deforming the collar into the grooves. BobTail is available in a wide range of sizes.

Declared by DIBt as 'maintenance free', the 12mm, 14mm, 16mm, 20mm and 1 inch diameter BobTail is approved to be used in both static and dynamic civil engineering applications (smaller and larger diameters are available by request).

The DIBt test confirmed that a BobTail is maintenance-free during the lifetime of the joint it is fastening, which is not the case when using traditional nut and bolt products. As a result, it can be integrated into a range of applications with complete confidence by civil engineering designers.

Through its advanced fastener design the BobTail system offers a strong connection. One key advantage of this fastener over conventional LockBolting systems is that it doesn’t have a pintail to break off. As a result, there is no waste material to collect and dispose of post-installation. The added benefit of this is that the tools are lighter and smaller as they do not need the force to break the pintail of a traditional Lockbolt.

The BobTail is installed using a quiet, jolt-free swaging action, eliminating the potential for repetitive stress syndrome issues. It has significantly reduced noise levels, typically less than 70dB as there isn’t a pintail to break off. The elimination of the shock load and reduced noise can offer real and significant health and safety benefits.

Using the Huck BobTail in key joining applications eliminates all of the housekeeping and safety issues that are integral to the welding process. There are no sparks to start fires or cause explosions, nor any debris on the floor that can lead to slips and falls.

LockBolts as an alternative to welding?

Manufacturers of heavy equipment are actively investing in direct tension LockBolts. Installing a BobTail fastener is significantly faster, stronger and safer than welding a joint. Let’s find out more…

BobTail consists of two pieces, called pin and collar

The pin has rolled annular lock grooves (shallower than helical threads) with two pull grooves.

The collar material is softer than pin, with no initial grooves.

The Installation Process:

The pin is simply inserted into the prepared hole.

The collar can be pre-spun onto the pin by hand if preassembly is required.

When the installation tool is applied and activated, the tool swages the collar onto the pin.

For more information on the Huck BobTail fasteners click here 

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