S-99461A286 Length 1/2" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and extended service life in plastic assemblies.
• Excellent thread-forming capability with Tri-Lobe shank design, creating strong, reliable threads in plastic materials without pre-tapping.
• High torque transfer and reduced cam-out provided by the Phillips drive and pan head, ensuring efficient installation and secure fastening.
• Optimized for plastic applications with a thread forming (TRS) design and blunt tip, minimizing material stress and cracking during installation.
• Precise dimensional compatibility with a No. 4-20 thread and 1/2" length, designed for use with a standard No. 44 drill bit (0.086" diameter).
• Full environmental compliance meeting RoHS 3 and REACH standards, ensuring safety and regulatory adherence for global industrial use.
• Versatile right-hand threading and fully threaded shank for consistent holding power along the entire fastener length in plastic components.

Professional Applications & Engineering Value

This 316 stainless steel tapping screw is engineered to address common challenges in plastic fastening, where material integrity and pull-out resistance are critical. The thread forming (TRS) design with its Tri-Lobe shank cross-section displaces plastic material to form precise, high-strength internal threads, eliminating the need for inserts and reducing assembly steps. This self-tapping screw provides exceptional vibration resistance and holding power in thermoplastics and other polymers, preventing loosening under dynamic loads. The Phillips pan head offers a low-profile, flush finish while enabling efficient drive engagement, making it ideal for industrial applications in electronics enclosures, automotive trim, and consumer products where corrosion resistance and reliability are paramount.

Specification Summary & Compliance

This screw conforms to standard inch system dimensions: No. 4-20 thread (0.112" diameter, 20 TPI) and 1/2" length, with a Class 2A thread fit. It features a pan head style (0.219" diameter, 0.08" height) and Phillips No. 1 drive. Manufactured as a thread forming tapping screw (TRS type) with right-hand direction and fully threaded shank. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring it is free from hazardous substances for safe use in various industries.