S-91772A515 4-40 x 1 5/8" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from passivated 18-8 stainless steel construction, ensuring long-term reliability in harsh industrial environments
• Exceptional tensile strength rated at 70,000 psi for reliable performance in high-stress applications
• Precision Class 2A thread fit provides consistent engagement and reduces cross-threading risks during assembly
• Fully threaded design offers maximum grip length and uniform load distribution across the entire fastener
• Optimized Phillips No. 1 drive enables efficient installation with standard driving tools while minimizing cam-out
• Coarse UNC threading ensures quick assembly and superior resistance to vibration loosening
• Comprehensive compliance with ASME B18.6.3 standards and environmental regulations for guaranteed quality and safety

Professional Applications & Engineering Value

This 4-40 UNC machine screw delivers critical performance advantages for industrial assembly applications where corrosion resistance and mechanical strength are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against oxidation and chemical exposure, making these rounded pan head screws ideal for manufacturing equipment, electronic enclosures, and outdoor machinery. The coarse thread configuration ensures rapid installation while maintaining secure fastening in vibration-prone environments. With full threading along the entire 1-5/8" length, engineers benefit from maximum thread engagement and uniform stress distribution, reducing the risk of joint failure in critical assemblies. The Phillips drive system offers reliable torque transmission for efficient production line installation.

Specification Summary & Compliance

This machine screw features precision 4-40 UNC coarse threading with Class 2A thread fit tolerances, ensuring consistent performance and interchangeability. Manufactured to ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, containing no restricted substances. The 70,000 psi tensile strength rating confirms the screw's suitability for demanding mechanical applications requiring reliable fastening performance.