S-90485A150 Length 5/16" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ensuring long-term reliability in various environments without rust or degradation.
• Excellent holding power in plastic materials due to the Tri-Lobe shank design, which creates secure, vibration-resistant threads without pre-tapping.
• Efficient installation with Phillips drive (No. 1 size) and standard flat head, allowing for flush mounting and quick assembly with common tools.
• Optimized thread forming performance featuring a blunt tip and fully threaded design for smooth insertion and reduced risk of material cracking.
• Precise compatibility with recommended No. 44 drill bit and 82° countersink angle, ensuring proper fit and minimal assembly errors in plastic applications.
• Compliance with environmental regulations including RoHS 3 and REACH, making these screws safe for use in regulated industries and global markets.
• Durable right-hand threading with 20 threads per inch, providing consistent engagement and strength in plastic assemblies.

Professional Applications & Engineering Value

These No. 4 TRS tapping screws are specifically engineered for plastic applications, where traditional fasteners may cause splitting or stripping. The 18-8 stainless steel material offers excellent corrosion resistance, ideal for outdoor or humid conditions, while the thread forming design with a Tri-Lobe shank displaces plastic material to form strong, permanent threads without chips. This eliminates the need for separate tapping operations, reducing assembly time and costs. The Phillips flat head ensures a clean, flush finish, and the fully threaded 5/16" length provides uniform clamping force. Commonly used in electronics enclosures, automotive trim, and consumer goods, these screws solve critical issues like vibration loosening and material fatigue, delivering reliable performance in industrial fastening scenarios.

Specification Summary & Compliance

This product adheres to standard inch measurements with precise dimensions: thread diameter of 0.112", 20 threads per inch, and a length of 5/16". The thread forming (TRS) type and right-hand threading follow industry practices for plastic fastening. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring no restricted substances are used. The screw is designed for use with a No. 44 drill bit (0.086" diameter) and an 82° countersink angle, supporting accurate installation and long-term durability in compliant applications.