S-91400A905 5/16"-18 x 1" FF-S-92, QQ-P-35, MS51957-98 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
• High tensile strength of 80,000 psi ensures reliable performance in demanding applications
• Easy installation and removal with Phillips No. 4 drive and fully threaded UNC coarse spacing
• Consistent fit and reduced cross-threading due to Class 2A thread fit precision
• Durable rounded pan head design provides a low-profile, secure fastening solution
• Compliance with major industry standards including Fed. Spec. FF-S-92, QQ-P-35, and MS51957-98
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance

Professional Applications & Engineering Value

This 5/16"-18 x 1" passivated 18-8 stainless steel rounded head screw is engineered to address common industrial challenges such as corrosion, vibration loosening, and assembly efficiency. The passivated surface treatment significantly enhances corrosion resistance, making it suitable for outdoor equipment, marine applications, and chemical processing plants where moisture and corrosive agents are present. The fully threaded UNC coarse spacing allows for quicker installation and stronger holding power in softer materials or when frequent disassembly is required. With its Phillips No. 4 drive and rounded pan head, it offers a balanced combination of torque transmission and a smooth, low-profile finish that minimizes snagging in machinery and enclosures. These features ensure long-term reliability and reduced maintenance costs in industrial assembly lines, automotive components, and electrical enclosures.

Specification Summary & Compliance

This screw features a 5/16"-18 UNC thread with Class 2A fit, ensuring precise dimensional accuracy and reliable engagement. It is manufactured in accordance with Fed. Spec. FF-S-92, QQ-P-35, and MS51957-98, guaranteeing consistency with established industrial standards. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety requirements for global supply chains.