S-92245A593 5/16"-18 x 2 1/2" FF-S-85, MS35307-342 Mil. Spec. 18-8 Stainless Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh environments and extended service life
• High tensile strength of 70,000 psi ensures reliable load-bearing capacity and structural integrity in demanding applications
• Rockwell B74 hardness provides excellent wear resistance and durability under mechanical stress
• UNC coarse threading with Class 2A fit allows for quick assembly, easy alignment, and secure fastening in various materials
• External hex drive design enables high-torque installation with standard tools, reducing installation time and effort
• Partial threading offers unthreaded shank strength where needed while maintaining precise thread engagement
• Compliance with RoHS 3 and REACH ensures environmental safety and regulatory acceptance for global industrial use

Professional Applications & Engineering Value

Engineered for rigorous industrial environments, these 18-8 stainless steel hex head screws deliver exceptional performance where corrosion resistance and mechanical strength are critical. The passivated surface treatment significantly enhances protection against oxidation and chemical exposure, making them ideal for marine, chemical processing, and outdoor infrastructure applications. Featuring UNC coarse threads and a Class 2A thread fit, they provide reliable fastening in metals, plastics, and composite materials, reducing the risk of cross-threading and ensuring consistent clamp load. The partially threaded design maximizes shear strength along the unthreaded portion while the external hex drive accommodates high torque applications, from heavy machinery assembly to structural frameworks, ensuring long-term reliability and reduced maintenance cycles.

Specification Summary & Compliance

This screw adheres to precise dimensional standards with a Class 2A thread fit and UNC coarse threading (5/16"-18), ensuring interchangeability and consistent performance. It meets Fed. Spec. FF-S-85 (MS35307-342) for material and manufacturing quality, and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and suitability for regulated industries.