S-91500A306 4-40 x 7/16" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
• Precision thread engagement through Class 2A UNC coarse threads ensuring secure fastening in various materials
• Streamlined installation with Phillips No. 1 drive and standard 82° countersink angle for flush mounting
• Full threading coverage along the 7/16" length provides maximum grip and uniform stress distribution
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards (RoHS 3, REACH)
• Right-hand thread design with coarse spacing enables quick assembly and disassembly in maintenance operations

Professional Applications & Engineering Value

These 4-40 UNC flat head screws in 316 stainless steel address critical challenges in corrosive and high-stress environments. The passivated finish enhances surface durability while maintaining the material's inherent resistance to chemicals and saltwater exposure. Engineered with fully threaded coarse UNC patterns and Class 2A fit, they prevent loosening under vibration and ensure consistent clamping force in machinery, electronic enclosures, and marine equipment. The 82° countersink angle and Phillips drive facilitate precise flush mounting in pre-drilled surfaces, reducing installation time while maintaining structural integrity. These industrial screws deliver long-term reliability where corrosion resistance and mechanical performance are paramount.

Specification Summary & Compliance

Manufactured to ASME B18.6.3 standards with Class 2A thread fit and UNC coarse threading. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Dimensions include #1 Phillips drive, 0.225" head diameter, 7/16" length, and standard flat head profile. Mechanical properties guarantee 70,000 psi tensile strength and Rockwell B80 hardness for consistent performance across industrial applications.