High Quality China Fastener Screw

Descripción del producto

A screw is a type of fastener, in some ways similar to a bolt, typically made of metal, and characterized by a helical ridge, known as a male thread (external thread). Screws are used to fasten materials by digging in and wedging into a material when turned, while the thread cuts grooves in the fastened material that may help pull fastened materials together and prevent pull-out. There are many screws for a variety of materials; those commonly fastened by screws include wood, sheet metal, and plastic.

SEMS screws combine two separate parts into one pre-assembled, low cost fastener. With washers under the head, SEMS screws are fast, permanent, and easily adaptable to many applications.

A fastener with a built in washer is called a SEM or SEMS, short for pre-asSEMbled. It could be fitted on either a tapered or non-tapered shank

Sems screws are machine screws that can have one or more flat or lock washer under the head already assembled.
HIMORE is a full fastener supplier of many types of sems screws. We offer them in both stainless steel and steel zinc (also available in yellow and black zinc). Our sems line includes both metric and inch screws.

We offer the following sems screws off the shelf:
•Head style
•Pan
•Hex head
•Hex washer head
•Washer
•Internal
•External
•Conical
•Double sems (split lock washer and a flat washer)