S-92245A584 5/16"-18 x 1 1/8" FF-S-85, MS35307-335 Mil. Spec. 18-8 Stainless Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to passivated 18-8 stainless steel construction, ideal for harsh or outdoor environments.
• High tensile strength of 70,000 PSI ensures reliable performance under significant load and stress.
• Rockwell B74 hardness provides excellent durability and resistance to wear and deformation.
• Coarse UNC threading allows for faster installation and reduced risk of cross-threading in industrial applications.
• External hex drive and hex head design offers secure, high-torque installation with common tools.
• Class 2A thread fit guarantees consistent, reliable engagement with nuts and tapped holes.
• Compliance with Fed. Spec. FF-S-85, RoHS 3, and REACH ensures material quality and environmental safety for regulated projects.

Professional Applications & Engineering Value

This 5/16"-18 UNC hex head screw is engineered to solve critical challenges in demanding industrial assembly and heavy-duty equipment applications. The passivated 18-8 stainless steel provides exceptional corrosion resistance, making it suitable for environments exposed to moisture, chemicals, or outdoor elements. Its coarse thread design ensures quick and secure fastening, reducing assembly time and minimizing the risk of thread stripping. With a partially threaded shank, it offers optimal clamping force where needed, preventing joint loosening under vibration. The external hex drive allows for high torque application, ensuring tight, reliable connections in machinery, structural frameworks, and automotive components. This fastener meets rigorous Fed. Spec. FF-S-85 standards, providing assurance for military, aerospace, and other high-stakes sectors where failure is not an option.

Specification Summary & Compliance

This screw features a 5/16"-18 UNC coarse thread with Class 2A thread fit for consistent dimensional accuracy and reliable mating. It is manufactured from 18-8 stainless steel with a passivated surface treatment, providing a tensile strength of 70,000 psi and Rockwell B74 hardness. The product complies with Fed. Spec. FF-S-85 (MS35307-335), ensuring adherence to strict federal standards. It is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming it is free of hazardous substances and safe for use in regulated markets.