LGP® HUCKCOMP® Stump-Type Lockbolts
LGPS7SC, LGPS8SC, LGPS9SC, LGPS9SP, & LGPS12SP
NAS2045 THRU NAS2052
NAS2055 THRU NAS2062
NAS2065 THRU NAS2072
Huck's lightweight (LGPS) HUCKCOMP® Stump Lockbolt fastener is a high-strength, lightweight aerospace fastener. Easily the most cost-effective aerospace fastener available. The HUCKCOMP® fastener can help reduce aircraft weight due to its all Titanium construction and improve fastener installation time due to automated installation methods.
The HUCKCOMP® stump fastener is a version of the LGP® fastener and is intended for applications in composite materials. The fastener has large bearing heads and accompanied with large bearing flanged based Titanium collars they provide a high clamp load distributed over a larger area to prevent material damage. This large bearing hi-clamp force gives the HUCKCOMP® stump fastener the ability to achieve enhanced joint integrity and fatigue performance.
The LGPL® 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® stump fastener is offered in LGPS8SC 100° MS24694 heads, LGPS7SC 100° MS20426 heads, LGPS9SC 130° low profile large bearing heads, LGPS9SP low profile large bearing protruding heads, and LGPS12SP intermediate large bearing protruding heads. All HUCKCOMP® stump fasteners are 6Al-4V Titanium at 95 KSI shear strength.
Collars for the HUCKCOMP® stump fastener are CP Titanium, which provides an all Titanium fastener installation, which is compatible with graphite epoxy type composite materials
The LGP® fastener features a tapered root diameter and variable pitch lock groove. A larger volume of collar material flows into the locking grooves at the beginning of the of the installation sequence. This gives the fastener it’s 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 which then results 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 are common 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 LGP® fastener. Annular grooves on the pin forms a series of separate barriers to prevent fuel seepage. Fay surface sealant flows 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/compression action rather than a torque/tension action there is no path for loosening in a vibrator environment. Low Collar-side Clearance
The installed height profile of the LGP® fastener is significantly lower than that of threaded fastener. Its low collar-side profile enables it to fit in tight space areas. Automated installations
Huck offers a variety of collar feed systems for use on drill riveter machines to enhance automated applications. Equipment for use on flat stock or deep pocket applications, as well as normal offset tooling for clearance applications. Additionally Huck provides a complete systems service representative to assist in set up and operation of LGP® automated systems.