S-91794A112 4-40 x 5/8" ASME B18.6.3 Stainless Steel Fillister Head Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction and passivated finish, ideal for harsh environments.
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-lasting fastening.
• Precise and secure fit ensured by UNC coarse threads with Class 2A fit, reducing cross-threading and simplifying installation.
• Optimized head design featuring a high, narrow fillister profile for a deeper drive engagement and reduced risk of cam-out.
• Full threading along the 5/8" length provides maximum grip and uniform stress distribution in assemblies.
• Compliance with industry standards including ASME B18.6.3, ensuring dimensional accuracy and interchangeability.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements.

Professional Applications & Engineering Value

This 4-40 UNC slotted fillister head screw is engineered to address critical challenges in precision assembly and machinery. The 18-8 Stainless Steel material, enhanced by a passivated finish, provides excellent resistance to oxidation and chemical exposure, making it suitable for applications in electronics, automotive, and marine industries where moisture and contaminants are concerns. The coarse thread and Class 2A fit facilitate quick, secure fastening with reduced installation torque, minimizing the risk of thread stripping in softer materials. Its high, narrow rounded head design allows for flush or recessed mounting, offering a sleek profile while maintaining strong torque transmission. Fully threaded along its 5/8" length, it ensures consistent clamping force, vital for vibration-prone environments. These features collectively enhance assembly efficiency, reduce maintenance needs, and support the longevity of industrial equipment.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including UNC thread form with Class 2A fit for consistent thread engagement and interchangeability. It is manufactured in compliance with ASME B18.6.3 specifications, ensuring reliability in mechanical performance. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances and supporting sustainable procurement practices.