S-91500A337 1/4"-20 x 3/8" 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 industrial environments and chemical exposure
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B80 hardness for reliable, long-lasting fastening performance
• Enhanced durability and chemical resistance from the passivated finish, extending service life in demanding applications
• Secure and efficient installation with the Phillips No. 3 drive and standard 82° countersink angle for flush mounting
• Precise thread engagement with Class 2A thread fit and coarse 1/4"-20 UNC threading for quick assembly and vibration resistance
• Full threading versatility allowing consistent grip along the entire 3/8" length for adjustable fastening depth
• Regulatory compliance assurance meeting ASME B18.6.3 standards, RoHS 3, and REACH for global industrial use

Professional Applications & Engineering Value

These 316 stainless steel flat head screws deliver critical performance in corrosive or high-moisture environments where standard fasteners fail. The passivated finish provides an extra protective layer against chemical degradation, making them ideal for marine equipment, chemical processing plants, and food industry machinery. With fully threaded UNC coarse threading and Class 2A thread fit, they ensure rapid installation and reliable vibration resistance in assembly lines, electrical enclosures, and structural frameworks. The 82° countersink angle and flat head design enable seamless flush mounting, eliminating protrusions in precision equipment while maintaining 70,000 psi tensile strength under dynamic loads.

Specification Summary & Compliance

This 1/4"-20 UNC flat head screw maintains precise Class 2A thread fit per ASME B18.6.3 specifications, ensuring dimensional accuracy and interchangeability. Manufacturing complies with ASME B18.6.3 standards for consistent quality, while meeting RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for safe industrial use. The right-hand coarse thread and standardized flat head profile guarantee reliable performance in high-volume assembly applications.