#4-40 X 3/8 SEM PHILLIPS PAN HEAD W/ EXTERNAL TOOTH LOCK WASHER ZINC

A SEMS assembly is a type of fastener that combines a screw and a washer into a single pre-assembled unit. The washer is attached to the screw in various ways, such as by being permanently attached or captive to the screw's threads. This design provides several advantages in terms of efficiency, ease of assembly and functionality.

SEMS assemblies are commonly used in a wide range of industries, including automotive, electronics, appliances, and construction, where they offer convenience, reliability, and efficient assembly solutions.