4-40 x 5/8 Flat Point Alloy Steel Socket Set Screw identifies the exact thread and length for an alloy steel socket set screw with a squared-off contact end.
For 4-40 x 5/8, review the flat point around compact equipment where an external screw head would interfere and machine stops, collars, and adjustment screws. The broad end face suits prepared flats, repeated adjustment, and jobs where unnecessary deformation of the mating component would create service problems.
The 4-40 designation supplies the ordering thread form, and the 5/8 in. length should be checked against tapped depth and bearing location. Keep the flat point callout intact when comparing older orders, drawings, or service notes. The material identity should remain attached to the set screw family because substitutions can change both ordering and application review.
The UNC series and 40 threads per inch are derived from the thread designation. This point style favors bearing contact over penetration, which helps separate it from sharper holding geometries. Cold Headers has supplied specialty socket fasteners since 1962, including set screws for uncommon service requirements.
