S-91737A051 2-56 x 1/4" ASME B18.6.3 Stainless Steel Fillister Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel and passivated finish, ideal for harsh environments.
• High tensile strength of 80,000 psi ensures reliable load-bearing capacity and joint integrity.
• Excellent drive engagement with Phillips No. 1 drive, reducing cam-out and speeding up installation.
• Optimized head design featuring a high, narrow rounded fillister profile for increased clearance and a professional finish.
• Precise coarse (UNC) threading with Class 2A fit provides easy assembly and consistent performance.
• Full threading along the 1/4" length allows for maximum grip and adjustment in various material thicknesses.
• Compliance with major industry standards including ASME B18.6.3, RoHS 3, and REACH for guaranteed quality and safety.

Professional Applications & Engineering Value

This 2-56 UNC rounded fillister head screw is engineered to solve common industrial challenges like corrosion, vibration loosening, and space constraints. The 18-8 stainless steel construction, combined with a passivated finish, provides exceptional resistance to rust and chemicals, making it perfect for electronics, instrumentation, and machinery assemblies exposed to moisture or demanding conditions. The high, narrow rounded head offers a low-profile yet robust fastening solution where clearance is limited. Its coarse UNC threads and Phillips drive ensure quick, secure installations, reducing assembly time and improving production efficiency in automated or manual settings.

Specification Summary & Compliance

This screw adheres to ASME B18.6.3 specifications, ensuring dimensional accuracy and interchangeability. Threads are UNC coarse with a Class 2A fit for reliable engagement. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and safe for various industrial applications.