4-40 x 1/4 Flat Point Alloy Steel Socket Set Screw with Nylon Insert is built for no-mark clamping where a broad flat face bears against the shaft instead of biting into it. The internal hex drive keeps the screw headless and accessible in collars, hubs, and compact machine details. Use the heat-treated alloy steel body with the nylon locking pellet where the application calls for mechanical fastening rather than stainless material.
OEM assemblies pairing flats on shafts with flat points use the mating geometry to spread contact across the seat. ASME B18.3 places flat point diameter in a qualitative band of about 0.55-0.62 times nominal screw diameter, so confirm the mating seat rather than substituting a sharp point.
Cold Headers supports industrial distributors, OEM buyers, and maintenance teams when a set screw must match the existing print. Check thread size, length, socket size, pellet dimensions, shaft-flat condition, and surface-marking tolerance before substitution.
Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.
