S-91500A583 5/16"-18 x 1" 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 and chemical exposure.
• High tensile strength of 70,000 psi ensures reliable performance and durability under heavy loads.
• Excellent flush mounting with an 82° countersink angle and standard flat head profile for seamless surface integration.
• Easy and secure installation provided by the Phillips No. 4 drive style, reducing cam-out risks.
• Consistent thread engagement with a fully threaded UNC coarse thread and Class 2A fit for quick assembly.
• Enhanced surface protection from the passivated finish, increasing longevity and wear resistance.
• Broad regulatory compliance including ASME B18.6.3, RoHS 3, and REACH, ensuring safety and environmental standards.

Professional Applications & Engineering Value

These 316 stainless steel flat head screws are engineered to address critical challenges in industrial settings where corrosion resistance and structural integrity are paramount. The combination of a passivated finish and UNC coarse threads ensures reliable performance in marine, chemical processing, and food-grade applications, preventing fastener failure due to rust or galling. The flat head design with an 82° countersink angle allows for smooth, flush mounting, eliminating protrusions that could snag or collect contaminants. With a Rockwell B80 hardness and 70,000 psi tensile strength, these Phillips drive screws provide robust clamping force and vibration resistance, making them ideal for machinery, structural assemblies, and equipment requiring RoHS 3 and REACH compliance for safe, long-term use.

Specification Summary & Compliance

This product features precise Class 2A thread fit and adheres to ASME B18.6.3 manufacturing standards for dimensional accuracy. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety requirements. The screw is manufactured with a right-hand thread direction, UNC coarse thread spacing, and a standard flat head profile, providing consistent performance in industrial fastener applications.