S-90585A544 1/4"-20 x 1 1/4" ASME B18.3 Stainless Steel Hex Drive 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 delivering 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-lasting fastening
• Precision thread engagement with Class 3A fit and UNC coarse threads ensuring secure, vibration-resistant connections
• Optimized flush mounting featuring an 82° countersink angle and flat head design for seamless, unobtrusive installations
• Efficient installation and removal with hex drive (5/32") enabling high torque application and reduced tool slippage
• Full-threaded design providing maximum grip length and uniform stress distribution across the entire fastener
• Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations (RoHS 3, REACH) for global supply chain compatibility

Professional Applications & Engineering Value

These 1/4"-20 UNC flat head screws in 316 Stainless Steel address critical industrial challenges where corrosion resistance, mechanical integrity, and precision fitting are paramount. The passivated finish enhances surface durability against chemical exposure and oxidation, making them ideal for marine, chemical processing, and food-grade equipment applications. With Class 3A thread fit and coarse UNC threading, they provide rapid assembly and superior vibration resistance in high-stress environments. The flat head with 82° countersink ensures flush mounting in precision-machined components, eliminating protrusions while maintaining structural integrity under 70,000 psi tensile loads. Engineered for industrial screw applications requiring reliable fastening in corrosive or temperature-variable conditions.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit tolerances and UNC coarse thread profile. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Dimensions include 1/4"-20 thread size, 1-1/4" length, 0.531" head diameter, and 5/32" hex drive. Material certification confirms 316 Stainless Steel composition with passivated surface treatment.