S-91772A122 4-40 x 1 3/8" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
• Exceptional tensile strength rated at 70,000 psi ensures reliable performance under high-stress applications
• Precise Class 2A thread fit provides consistent engagement and reduces cross-threading risks during assembly
• Optimized Phillips No. 1 drive delivers secure torque transmission and reduces driver slippage
• Full threading along 1-3/8" length enables maximum adjustment flexibility and holding power
• Rockwell B70 hardness maintains structural integrity and resists deformation under repeated use
• Compliant with major industry standards including ASME B18.6.3 for dimensional consistency

Professional Applications & Engineering Value

These 4-40 UNC pan head Phillips screws solve critical fastening challenges in industrial equipment, electronic enclosures, and machinery assemblies. The passivated 18-8 stainless steel construction provides excellent resistance to oxidation and chemical exposure, while the coarse UNC threads ensure rapid installation and vibration resistance. The combination of 70,000 psi tensile strength and fully threaded design creates reliable joints that maintain clamping force in dynamic operating conditions. The rounded pan head profile distributes bearing stress evenly, preventing surface damage to components during tightening operations.

Specification Summary & Compliance

Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerance for precise engagement. Features 4-40 UNC coarse threads with right-hand direction and standard pan head profile. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industries including electronics, automotive, and industrial machinery applications.