S-91613A431 4-40 x 3/16" ASME B18.6.3 Stainless Steel Fillister Head Slotted 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 delivering 100,000 psi tensile strength and Rockwell B100 hardness for reliable load-bearing performance
• Precision thread engagement with Class 2A fit and UNC coarse threads ensuring secure fastening and vibration resistance
• Optimized head design featuring a high, narrow fillister profile for enhanced tool clearance and professional appearance
• Full threading capability providing consistent grip along the entire 3/16" length for uniform clamping force
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
• Versatile drive compatibility with slotted drive style for broad tool accessibility in maintenance and assembly applications

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 4-40 UNC rounded head slotted screws provide critical solutions where corrosion resistance and mechanical reliability are paramount. The 316 Stainless Steel composition with passivated finish offers superior protection against chemical exposure and atmospheric corrosion, making them ideal for marine, chemical processing, and food industry applications. The coarse thread design ensures quick assembly and reduced cross-threading risks, while the fillister head profile provides improved torque transmission and clearance in confined spaces. These fully threaded fasteners maintain consistent clamping force across the entire engagement length, preventing loosening under vibration and thermal cycling conditions common in industrial machinery and equipment assembly.

Specification Summary & Compliance

This 4-40 UNC screw features precision Class 2A thread fit with right-hand thread direction and coarse thread spacing. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance standards. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental regulations for hazardous substances. Mechanical properties include Rockwell B100 hardness and 100,000 psi tensile strength, ensuring reliable performance in critical fastening applications.