4-40 X 3/4 SHCS 18-8 PATCH
Description
An externally threaded fastener with unified threads, a cylindrical head with a flat chamfered top surface, knurled cylindrical sides, and hexagonal recess, made from stainless steel.
Application/ Advantages
Although stainless socket cap screws have significantly less tensile and yield strength than alloy sockets, they have superior resistance to corrosion. They retain their mechanical and performance capabilities at higher than ambient temperatures.
Hardness
Rockwell B80 minimum.
Patch Process
Fasteners are heated and sprayed with a custom nylon powder that adheres to the part. When assembled with a mating part, the engineered plastic nylon patch is compressed. Due to the elastic memory, it resists this compression and acts as a wedge, increasing the metal to metal contact 180° opposite the material. This mechanical force creates a strong, yet fully adjustable lock which will not weaken, even under extreme vibration.