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Socket Shoulder Cap Screws
Socket shoulder cap screws—also known as shoulder bolts or stripper bolts—are precision fasteners engineered with an enlarged, unthreaded shoulder and a socket head for high‑torque installation. The precision‑ground shoulder provides a smooth, accurate bearing surface ideal for pivot points, sliding mechanisms, tooling setups, machinery assemblies, pulleys, die sets, and automated equipment.
Designed for alignment, shear strength, and repeatable movement, shoulder screws allow components to rotate, slide, or locate accurately under load. The socket (Allen) drive provides excellent torque control and secure fastening in applications where precision and reliability are essential.
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Socket shoulder cap screws are widely used across manufacturing, robotics, mold‑making, automation, and industrial machinery due to their ability to function as guides, axles, pivots, and mounting points. The smooth shoulder diameter ensures consistent performance and tight tolerances, while the threaded portion provides strong clamping force.
Available in a variety of materials, finishes, shoulder diameters, and thread lengths, these screws support high‑precision engineering requirements and are commonly chosen for jigs, fixtures, linkages, and motion‑control assemblies. Their versatility and durability make them a staple component in OEM production and mechanical design.
