WT cylinder head screws with hex socket according to WT standard WT-Z-2017 made of plastic (see material properties) with metric threads up to the head.

Standard plastics for our fiberglass-reinforced plastic screws are polyamides (PA) with 30%, 50%, or 60% fiberglass content.

However, screws made from PEEK with 30% fiberglass content, PE, POM, ABS, and other common thermoplastics are also available. Custom colors are possible upon request.

The mechanical and physical properties, especially tensile strength, depend on environmental conditions. Practical testing is recommended. Use a torque wrench or torque screwdriver for tightening. The recommended value is 50% of the breaking torque.