Inch Socket Shoulder Screws

Socket Shoulder Screws (also called Stripper Bolts or Axle Bolts) are unique fasteners that are commonly used as a bearing or spacer in numerous applications.  The smooth, unthreaded shoulder gives this screw its versatility by acting as a dowel or shaft for rotational items such as bushings, bearings, axles, guides, pulleys, gears or pivot points.  Socket Shoulder Screw sizes are identified by the shoulder diameter and length, not the actual threaded portion.  The modified fillister head diameter is roughly twice the head height.  The thread diameter is the next standard size down from that of the shoulder.  Hence, a 3/8” diameter Shoulder Screw will have a thread diameter of 5/16-18, a 5/16” diameter Shoulder Screw will have a thread diameter of ¼-20, etc.  Based on the shoulder diameter, the thread length is held to a constant as well: a 3/8” diameter Shoulder Screw will have a thread length of ½”, a 5/16” diameter Shoulder Screw will have a thread length of 7/16”, etc.