S-99397A761 Length 8 mm Tapping Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with 18-8 stainless steel construction, ideal for humid or demanding environments.
• Superior torque transmission and reduced cam-out thanks to the Torx Plus IP20/T20 drive, ensuring secure fastening and minimal tool wear.
li>Reliable thread formation in plastic with the Tri-Lobe shank and blunt tip design, preventing material cracking and ensuring high strip-out resistance.
• Optimized for automated assembly with a fully threaded M4.55 body and standard 1.59mm pitch for consistent, predictable driving performance.
• Broad compatibility and secure fit from the rounded pan head style, providing a low-profile, finished appearance and good bearing surface.
• Compliance with global environmental standards, being RoHS 3 and REACH compliant, ensuring safe use in regulated industries.

Professional Applications & Engineering Value

This M4.55 x 8mm Torx Plus TRS tapping screw is engineered specifically for high-performance plastic assembly applications. The 18-8 stainless steel material offers excellent durability and resistance to oxidation, which is critical in electronics enclosures, automotive interiors, and outdoor equipment where environmental factors can degrade fastener integrity. The Tri-Lobe shank and thread forming (TRS) design displace plastic material during installation, creating strong, permanent threads without the need for a pre-tapped hole. This eliminates chip formation, reduces assembly steps, and minimizes the risk of stress cracking in brittle plastics. Combined with the high-torque Torx Plus drive (IP20/T20), this screw ensures reliable, vibration-resistant connections in automated production lines, enhancing overall manufacturing efficiency and product longevity.

Specification Summary & Compliance

This metric tapping screw features a size of M4.55 x 8mm with a fully threaded body and an approximate thread pitch of 1.59mm. The screw has a rounded pan head with an 8mm diameter and a Tri-Lobe shank cross-section for thread forming in plastics, requiring a No. 23 (0.154") drill bit for proper installation. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in environmentally conscious manufacturing processes.