S-91737A256 1/4"-20 x 3/4" ASME B18.6.3 Stainless Steel Fillister Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments.
• High tensile strength of 80,000 PSI provides exceptional load-bearing capacity and resistance to mechanical failure under stress.
• Optimized torque transmission via the No. 3 Phillips drive and fillister head design, reducing cam-out and improving installation efficiency.
• Coarse UNC thread with Class 2A fit ensures easy alignment, faster assembly, and reliable performance in a wide range of materials.
• Full threading along the 3/4" length offers maximum grip and uniform clamping force across the entire engagement area.
• Rockwell B85 hardness enhances wear resistance and maintains thread integrity through repeated use.
• Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees consistent quality, safety, and environmental responsibility for industrial use.

Professional Applications & Engineering Value

This 1/4-20 UNC screw with a rounded fillister head is engineered to address critical challenges in industrial assembly, such as vibration resistance, corrosion in humid or chemical-exposed settings, and the need for rapid, secure fastening. The 18-8 stainless steel material, combined with a passivated finish, significantly extends service life by preventing oxidation and galvanic corrosion. The coarse thread design and Class 2A fit facilitate quick installation in metals, plastics, and composites, reducing assembly time while maintaining precise alignment. Ideal for machinery, electronic enclosures, and automotive components, this screw delivers reliable performance where high tensile strength and regulatory compliance are non-negotiable.

Specification Summary & Compliance

This product adheres to ASME B18.6.3 specifications, ensuring dimensional accuracy and mechanical consistency. The UNC coarse thread follows standardized 1/4"-20 sizing with a Class 2A tolerance for reliable fit. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances. Manufactured to deliver 80,000 PSI tensile strength and Rockwell B85 hardness, it meets rigorous industrial demands for durability and safety.