SEMS Screw

SEMS screws are pre assembled screw and washer combinations where the washer is permanently retained on the screw before installation. The washer can be a flat washer, lock washer, or a combination of both, and it stays captured under the head so it cannot fall off or be installed incorrectly. SEMS screws are commonly used in high volume assembly because they reduce handling time, prevent missing washers, and improve consistency on the production line.

SEMS screws are specified by the screw type, size, length, head style, drive, and the washer style and diameter. They are used in electronics, appliances, sheet metal assemblies, automotive components, and general equipment where repeatable assembly matters. Selecting the right SEMS screw involves ensuring the washer provides the needed bearing area or locking function for the joint, and confirming the screw material and finish match the environment and corrosion requirements.

Shop SEMS screws and metric SEMS screws today.