Pin & Collar Fasteners
- The Maf Fastening System provides a simple, straight forward solution for fastening materials which are sensitive to high clamping loads. This three piece system, consisting of a fine pitch threaded pin and sleeve and locking collar provides precise controlled clamp-up of materials such as composite sandwich panels, soft core foam panels, metallic sandwich panels or other materials which may be sensitive to high bearing stresses. Because the threaded sleeve is “free running” (void of prevailing torque type locking devices) installation torque values can be precisely adjusted to yield the controlled clamping force required by the joint design specification for the structure. A unique positive mechanical lock, independently installed after the torquing operation, makes the fastener ideal for use in vibration and F.O.D. critical applications. The slight protrusion of the pin after installation may be shaved with conventional shaving tools to provide optimal flushness on aerodynamic surfaces. These features combine to make the Maf ideally suited to the soft core or honeycomb panels used in engine nacelles, fairings, control surfaces etc. The Maf system is available in three configurations; full shank, reduced shank diameter and variable grip. Each functions in a 1/16” grip range, is available with protruding heads, a protruding / flush combination or a double flush (flush sleeve & flush pin) configuration and is manufactured in 11/64” through 21/64” nominal diameters with 1st and 2nd oversize availability. Four different materials; 8740 alloy steel, A-286 cres steel, Inconel-718 and 6AL-4V titanium alloy provide shear strengths of 95KSI and 108 KSI.
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