Captive Screw Grade 8 Bolts Cap Head Screw Fastener Suppliers

Captive screw is an engineered class of fastener designed for a permanent hold (captivation) within a target assembly or housing, including upon servicing. They provide a secure joining and avoid fastener loss or damage that might be caused by a loose part.
A captive screw is often made with thread locking, press-fitting, or broaching to accomplish an anchor-hold within a larger assembly housing. However, a captive fastener may also be melded with the material into which it is joined, either through cold forming or welding.
Ever Hardware provides custom-made fasteners and customizable packaging.

Heat treating makes the captive screw high strength to grade 8 or grade 10.9 even grade 12.9. Heat treating is a group of industrial and metalworking processes used to alter the physical, and sometimes chemical, properties of a material. The most common application is metallurgical. Heat treatments are also used in the manufacture of many other materials, such as glass. Heat treatment involves the use of heating or chilling, normally to extreme temperatures, to achieve the desired result such as hardening or softening of a material. Heat treatment techniques include annealing, case hardening, precipitation strengthening, tempering, normalizing, and quenching. It is noteworthy that while the term heat treatment applies only to processes where the heating and cooling are done for the specific purpose of altering properties intentionally, heating and cooling often occur incidentally during other manufacturing processes such as hot forming or welding. Zinc coatings prevent oxidation of the captive screw by forming a barrier and by acting as a sacrificial anode if this barrier is damaged.