4-40 x 3/4 Alloy Steel Button Head Socket Cap Screw is selected for socket-drive fastening where head projection, appearance, and bearing area all matter. The alloy steel construction is suited to mechanical assemblies where the drawing calls for a low-profile rounded head and internal hex drive access.
Suitable assembly locations include guards and access panels where maintenance crews can remove covers without extra external wrench clearance. The same head style is useful for automation equipment and conveyor assemblies when the compact head profile helps protect nearby moving components. Unlike a standard socket head cap screw, the button head emphasizes a lower rounded profile and broader exposed head for applications that benefit from that geometry.
For drawings using the 4-40 thread and 3/4 in. length, the reference head diameter is 0.201-0.213 in. and the head height is 0.051-0.059 in. The nominal body diameter and hex-key information below support fit checks, tool access planning, and replacement verification.
Reference dimensions may vary slightly by manufacturer.
Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.
