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HUCKCOMP® LGP® Pull-Type Lockbolts

HUCKCOMP® LGP® Pull-Type Titanium Lockbolts

LGPL7SC, LGPL8SC, LGPL9SC, LGPL9SP & LGPL12SP
NAS2015 Thru NAS2022
NAS2025 Thru NAS2032
NAS2035 Thru NAS2042
 
Huck’s lightweight (LGP®) HUCKCOMP® Lockbolt fastener is a high-strength, lightweight, aerospace fastener intended for use in composite material applications. Easily the most cost-effective aerospace fastener available for fastening composite material. The HUCKCOMP® can help reduce aircraft weight due to its all Titanium construction and improve fastener installation time due to its pull action installation method.
 
The HUCKCOMP® fastener is a modified version of the LGP® fastener incorporating the same design features. The fastener has large bearing heads and accompanied with large bearing flanged based Titanium collars that provide a high clamp load distributed over a larger area so as not to cause material damage. This large bearing hi-clamp force gives the HUCKCOMP® fastener the ability to achieve joint integrity and enhanced fatigue performance.
 
The LGP® for composite applications is the newest version of the Huck Lockbolt family, which has been used on aircraft for over 50 years. Unlike threaded fasteners, Lockbolts install rapidly and cannot vibrate loose. Their unique design assures predictable consistent clamp force.
 
Design Features
The HUCKCOMP® fastener is offered in LGPL8SC 100° MS24694 heads, LGPL7SC 100° MS20426 heads, LGPL9SC 130° low profile large bearing heads, LGPL9SP low profile large bearing protruding heads, and LGPL12SP intermediate large bearing protruding heads. All HUCKCOMP® fasteners are 6Al-4V Titanium at 95 KSI shear strength.
 
Collars for the HUCKCOMP® fastener are CP Titanium, which provides an all Titanium fastener installation, which is compatible with graphite epoxy type composite materials
The HUCKCOMP® Lockbolt features lock grooves with a tapered root diameter and variable pitch. A larger volume of collar material flows into the locking grooves at the beginning of the installation sequence. This gives the fastener its greatest tensile strength where it is most crucial during swaging of the collar so that a high clamp force can be developed with out loss of strength during collar swaging/extrusion resulting in a high residual clamp and high ultimate tensile. The 60° included angle of the locking groove has a 20-degree pressure flank angle, which serves as a platform for retaining the high clamp load generated during collar installation.
 
Cost effective Features
 
Sloped surface installations
The HUCKCOMP® fastener can be installed on sloped surfaces up to 5° on the collar side of material being fastened.

With this feature, heavy, costly, self-aligning washers and special nuts are not required. Inventory costs as well as structural weight is reduced. Fewer parts to handle translate into greater labor efficiency.
 
Extended grip range
The HUCKCOMP® fastener has a usable 3/32" grip range, which reduces inventory, and installation errors that may occur when using conventional 1/16" grip range fasteners. The extended grip range makes the HUCKCOMP fastener more forgiving if the installer needs a fastener just over or just under the recommended grip which often happens when fastening composite materials due to variations in material thickness and use of liquid shim materials.
 
Self-Sealing
The labor-intensive job of over-coating each fastener or the use of heavy, costly sealing nuts is eliminated with the LGPL fastener. Annular grooves on the pin forms a series of separate barriers to prevent fuel seepage. Fay surface sealant flow during installation due to high clamp load ensures reliable fay surface sealing.
 
Vibration Resistance
Because the HUCKCOMP® fastener uses annular instead of helical grooves and installations are made with a tension/tension action rather than a torque/tension action there is no path for loosening in a vibrator environment.
 
Minimal Rework
Because the HUCKCOMP® fastener is a pull-type installation there is no surface damage often associated with torque type fasteners resulting in no surface damage.



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