S-91500A581 5/16"-18 x 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 chemical and marine environments.
• Enhanced durability and longevity from the passivated finish, which increases surface hardness and prevents rust.
• Reliable fastening performance with a tensile strength of 70,000 psi and Rockwell B80 hardness for high-stress applications.
• Easy installation and removal thanks to the Phillips drive and coarse UNC threading, reducing assembly time.
• Precise flush mounting with a standard 82° countersink angle and flat head design for seamless surface integration.
• Consistent thread quality with Class 2A fit and full threading, ensuring secure and vibration-resistant connections.
• Compliance with industry standards including ASME B18.6.3, RoHS 3, and REACH, guaranteeing safety and regulatory adherence.

Professional Applications & Engineering Value

These 316 stainless steel flat head screws are engineered to address common industrial challenges, such as corrosion in aggressive settings like chemical processing, marine equipment, and outdoor structures. The passivated finish enhances the innate resistance of 316 stainless steel, preventing pitting and extending service life in humid or saline conditions. With coarse UNC threading and a Phillips drive, they offer quick, secure fastening in materials where fine threads might strip, reducing installation errors. The fully threaded design and Class 2A thread fit provide uniform load distribution, minimizing loosening under vibration. Ideal for industrial applications requiring reliable, corrosion-resistant fasteners, these screws deliver long-term value by reducing maintenance costs and downtime.

Specification Summary & Compliance

This screw features precise dimensions, including a 5/16"-18 UNC coarse thread with Class 2A thread fit for consistent tolerance, a head diameter of 0.597", and a length of 3/4". It complies with ASME B18.6.3 manufacturing standards, ensuring dimensional accuracy and performance. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and safe for various industrial uses.