Composi-Lok®

By providing a large blind-side upset, hailed by some as the industry benchmark, Composi-Loks® distribute bearing loads over a large area, overcoming damage to the composite. The characteristic large blind-side bearing area or “footprint” allows the fastener to impart very high clamp loads to the structure without damage to the composite. Structural integrity in severe vibration environments is assured by a patented locking feature. Proper installation can be achieved with simple and compact hand or power tools and verified from one side of the structure by measurement of the screw break-off position. Available in four distinct 75 KSI shear strength versions, all Composi-Loks® are completely compatible with graphite and are not subject to galvanic corrosion. Composi-Loks® are available in 5/32″ through 3/8″ diameters, including oversizes, and have a .050″ operational grip range.

Composi-Lok II

Composi-Lok II fasteners incorporate Monogram’s drive nut concept, further simplifying the installation process by incorporating a disposable hex drive nut. The hex drive nut provides a positive fastener-to-tool engagement and eliminates the tendency for flush-style fastener recesses to “cam out” during installation. Since the drive nut is common to a variety of diameters and all head styles, only three nose pieces are required to install the entire Composi-Lok® line. Nose pieces never wear out, and the disposable magnetic drive nut stays on the discarded pintail after installation, permitting easier retrieval and minimizing the chances of small pintails finding their way into F.O.D. critical areas. Composi-Lok IIa and Composi-Lok3 variations also incorporate the drive nut feature.

For automated or robotic assembly, Composi-Loks® can also be supplied with Monogram’s Double Cylindrical Drive (DCD) system. The DCD system provides a common tool interface regardless of head style, fastener grip, or diameter. And, because the interface and drive mechanism are cylindrical, there are no orientation problems!

Composi-Lok IIa

Composi-Lok IIa fasteners, with their unique design characteristics, address the inherent thickness variations of composite material stack-ups. These common variations make proper grip measurement practices imperative to assure proper fastener performance and joint integrity. These concerns are minimized by the ability of the Composi-Lok IIa to function properly even when installed .050″ beyond its prescribed grip accommodation.
While design considerations should be limited to the optimum performance characteristics of the fastener within its prescribed .050″ grip range, the added assurance of joint integrity in limited out-of-grip conditions is available with Composi-Lok IIa. This extended grip capacity of .025″ under minimum grip to .025″ over maximum grip (for a total of .100″) with no composite damage and joint performance still in excess of guaranteed minimums makes the Composi-Lok IIa one of the most tolerant blind fasteners for composites on the market.

Composi-Lok3

Composi-Lok3 is the newest cost-saving design in the Composi-Lok series. With one of the most trusted names in aircraft assembly as its foundation, Composi-Lok3 delivers lower installed costs and increased productivity. Designed to afford a flush to below-flush break-off, the Composi-Lok3 requires no secondary shaving, milling, or grinding operations to meet aerodynamic flushness requirements. All the performance and reliability of our Composi-Lok is now available with a flush break-off. Without compromise on mechanical properties, high preloads, or large blind side head formation, you save on tooling expense as well as the time and cost of shaving while productivity is increased with labor dedicated to other tasks.