4-40 x 3/16 is an alloy steel socket set screw fitted with a brass tip for machinery and tooling locations where surface marking must be controlled.
Typical uses include machine-tool stops on finished ways, fixture pads, and locating features used during setup. The 3A thread fit keeps the screw in the precision set-screw class while the tip changes the way the end contacts the part. Brass gives a firmer metallic contact face when that contact style is preferred over nylon.
Tip installation is handled by Cold Headers in Chicago, giving this category a practical home for soft-face set screw requirements. A nylon insert acts on the thread; a nylon or brass tip acts on the mating surface, so the two product families should not be substituted blindly.
Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.
