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Huck® Bobtail® from Arconic Fastening Systems

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 tooling, 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 on the market. As a result, no torque or impact is transferred to the operator.


Key Benefits

Unmatched Installation Speed

BobTail fasteners install in only 2 seconds, up to twice as fast as any other large diameter LockBolt on the market*.

High Fatigue Strength Thread Form

BobTail thread form is shallower than a common bolt thread, so there is a larger cross-sectional area to spread out the service load, and fatigue strength increases.

The thread form also has a much larger root radius than a common bolt thread, so stress concentration at the thread root is also reduced, which increases fatigue strength even more.

BobTail Hardened Pin

Maintenance Free

The Huck BobTail 12,14,16, 20mm and 1 inch diameters, after lengthy and vigorous independent testing, has gained the prestigious Allgemeine bauaufsichtliche Zulassungen (German national technical approval) from the world renowned DIBt (Deutsches Institut für Bautechnik) for use in both static and dynamic applications in civil engineering.

Furthermore, the approval concludes that retorque/retension of an installed Huck BobTail LockBolt is not possible, as well as being not necessary, and connections do not require maintenance regarding preload.

Thus joints fastened together by large diameter Huck BobTail LockBolts, within the range specified, are maintenance free.

Consistent Clamp

Unlike conventional nuts and bolts, Huck fasteners will not work loose, even during extreme vibration.

Installation Indicator on Collar for Visual Inspection

The swage indicators indent when installation is complete. (12-20mm diameter).

BobTail Undriven collar
Prior to Installation
BobTail Installed Collar
After Installation

Low Installation Noise & No Waste

No pin-tail or pin-break hence resulting in; no material waste, low installation noise and increased corrosion resistance.

Easy to Learn, Shock Free Installation

Eliminates jolts to the operator’s arms and hands.

Unique Helical Lock Groove

Holds pin and collar in place prior to installation.


How to Install a BobTail

1. The BobTail Pin is inserted into the prepared hole of the joint assembly, and the BobTail Collar is placed over the Pin.

2. The Huck Installation Tool Nose Assembly is located onto the annular pull grooves of the Pin. When the tool is activated, a Puller in the Nose Assembly moves the Nose Assembly toward the Collar, causing the swaging Anvil to press on the collar, closing any gap in the joint assembly.

3. At a predetermined force, the Anvil begins to swage the Collar into the lock grooves of the Pin. Continued swaging elongates the Collar and Pin, developing precise clamp in the joint.

4. When swaging of the Collar into the lock grooves is complete, the Tool ejects from the installed Fastener, releasing the Puller from the Pin to complete the sequence. Depending on the type of BobTail Tool used, the ejection cycle will happen either automatically, or when the operator releases the Tool Trigger.

BobTail Material Grades and Diameter Combinations

Available Steel Grades Diameter (mm)
5.8 6.4, 7.9
8.8 7.9, 9.5, 12.7, 15.9, 19.1, 22.2, 25.4
10.9 12, 14, 16, 20

Huck Bobtail Tooling

Swage Forward Technology
BobTail® tooling makes the installation process quicker and easier by reducing the force required to install each fastener. Compact, lightweight, and ergonomic, BobTail tooling offers superior operator flexibility and extended reach into difficult areas, especially tight, space-constrained applications.

In addition, BobTail tooling offers safe and silent performance. The BobTail fastener is installed without a pin-break, dramatically reducing noise on the shop floor, and improving worker hearing safety. Instances of foreign object damage (FOD) and loose pintail injuries are eliminated. And because BobTail tooling features a smooth, shock-free installation sequence, repetitive stress injuries are eliminated, and overall safety is increased.

* Disclaimer The information contained is only for general guidance with regard to properties of the products shown and/or the means for selecting such products, and is not intended to create any warranty, express, implied, or statutory; all warranties are contained only in AFS's written quotations, acknowledgments, and/or purchase orders. It is recommended that the user secure specific, up-to-date data and information regarding each application and/or use of such products.