S-91500A361 1/4"-20 x 1 3/4" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments including marine and chemical applications
• Exceptional tensile strength of 70,000 psi ensures reliable fastening under high-stress industrial conditions
• Precision UNC coarse threading provides faster installation and reduced cross-threading risk compared to fine threads
• Passivated surface finish enhances corrosion protection and extends service life in demanding applications
• Standard flat head profile with 82° countersink angle enables flush mounting for clean, professional installations
• Phillips drive design offers familiar, secure tool engagement for efficient assembly operations
• Full threading along entire shank allows maximum grip length and adjustment flexibility

Professional Applications & Engineering Value

This 316 stainless steel flat head screw delivers critical performance advantages for industrial applications where corrosion resistance and structural integrity are paramount. The combination of marine-grade 316 stainless steel and passivated finish provides exceptional protection against saltwater, chemicals, and industrial atmospheres, solving common failure points in marine equipment, food processing machinery, and outdoor structures. The UNC coarse thread pattern ensures rapid installation in production environments while maintaining secure fastening. With its standard flat head profile and 82° countersink angle, this screw creates flush surfaces in machinery, electronic enclosures, and structural assemblies, eliminating protrusions that could interfere with operation or safety. The Phillips drive system offers reliable torque transmission for consistent clamping force in automated or manual assembly processes.

Specification Summary & Compliance

Manufactured to exacting Class 2A thread fit tolerances for consistent engagement and reliability. This flat head Phillips screw complies with ASME B18.6.3 dimensional and mechanical specifications, ensuring interchangeability and performance predictability. The product meets RoHS 3 (2015/863/EU) compliance for restricted substance control and REACH (EC 1907/2006) regulations for chemical safety. With Rockwell B80 hardness and precision UNC 1/4"-20 threading, this fastener delivers reliable performance in demanding industrial applications while maintaining full regulatory compliance.