Quarter Turn Fastener Countersunk Steel Allen Head Button, 0.550" Length, #6 Spring - Pack of 10 - FBRFB55F

Quarter Turn Fastener – Countersunk Steel Allen Head Button, 0.550" Length for #6 Spring

A precision countersunk steel Allen head button for use with #6 quarter turn panel fastener springs. Originally developed for the military aircraft industry, quarter turn fasteners have become the go-to choice in off-road racing and motorsport for their lightweight, durable, and tool-efficient design. Ideal for mounting sheet metal and fibreglass panels quickly and securely.

Important Shank Diameter Note

The manufacturer rates this button as a 7/16" shank. The actual measured shank diameter is 0.406" — sitting between 3/8" (0.375") and 7/16" (0.4375"). Please confirm fitment with your spring before ordering.

Quarter Turn Sizing Reference

• #5 = 5/16" button diameter
• #6 = 3/8" button diameter
• Button length is measured from the panel surface to the bottom edge of the spring seat

Applications

• Sheet metal & fibreglass panel mounting
• Off-road race vehicles
• Rally, drag, and circuit builds
• Body panels, belly pans, and access covers

Specifications