S-91772A116 4-40 x 1 1/4" 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 mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable performance under load
• Optimized fastening efficiency through fully threaded UNC coarse thread design ensuring maximum holding power
• Precise installation control with Phillips No. 1 drive and Class 2A thread fit for consistent, secure assemblies
• Enhanced surface compatibility with rounded pan head profile distributing clamp force evenly without marring surfaces
• Regulatory compliance assurance meeting ASME B18.6.3 standards for dimensional accuracy and quality
• Environmental responsibility with RoHS 3 and REACH compliance for sustainable manufacturing practices

Professional Applications & Engineering Value

These 4-40 UNC pan head screws deliver critical performance advantages in industrial fastening applications where corrosion resistance and mechanical reliability are paramount. The passivated 18-8 stainless steel construction provides excellent protection against oxidation and chemical exposure, making them ideal for machinery, electronic enclosures, and outdoor equipment. The coarse UNC threading ensures rapid installation and superior vibration resistance, while the fully threaded design maintains consistent clamping force across the entire fastener length. With Phillips drive compatibility and standardized rounded head profile, these screws enable efficient assembly processes while preventing damage to sensitive components. Engineered to withstand demanding conditions, they offer long-term reliability in manufacturing, automation, and structural applications where fastener failure is not an option.

Specification Summary & Compliance

This 1-1/4" pan head screw features precise Class 2A thread fit with UNC coarse threading (4-40 size) ensuring dimensional accuracy per ASME B18.6.3 specifications. The fastener maintains strict compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial markets. Manufacturing standards guarantee consistent 0.112" thread diameter and proper thread spacing for reliable engagement with mating components.