S-96640A181 1/4"-20 x 5/8" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance due to Black-Oxide coated 18-8 Stainless Steel, ideal for harsh environments and reducing maintenance costs.
• High tensile strength of 80,000 psi ensures reliable fastening under significant load, minimizing the risk of failure in demanding applications.
• Precise Class 2A thread fit provides smooth assembly and consistent clamping force, improving production efficiency.
• Standard 82° countersink angle and flat head allows for a flush, secure fit in countersunk holes, enhancing safety and aesthetics.
• Fully threaded coarse (UNC) design offers maximum grip and holding power across the entire shank length.
• Phillips No. 3 drive ensures common tool compatibility and efficient installation with standard drivers.
• Compliance with major industry standards including ASME B18.6.3, guaranteeing dimensional reliability and interchangeability.

Professional Applications & Engineering Value

This 1/4"-20 UNC flat head screw is engineered to solve critical challenges in industrial assembly. The Black-Oxide 18-8 Stainless Steel construction provides superior resistance to rust and corrosion, making it an excellent choice for machinery, outdoor equipment, and applications exposed to moisture or chemicals. The combination of 80,000 psi tensile strength and Rockwell B80 hardness ensures the fastener maintains integrity under vibration and stress, preventing loosening and joint failure. The fully threaded coarse thread and Class 2A fit enable quick, reliable installation in a variety of materials, from metal brackets to composite panels, streamlining production lines and reducing assembly time. Its flat head with an 82° countersink is specifically designed for applications where a smooth, flush surface is required, eliminating protrusions that could cause injury or interfere with moving parts.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with a Class 2A thread fit for standard tolerance and easy assembly. It is manufactured to meet ASME B18.6.3 specifications for dimensional accuracy. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for use in various industrial and commercial applications.