S-92245A541 1/4"-20 x 7/8" FF-S-85, MS35307-307 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 industrial environments and extended service life.
• High tensile strength of 70,000 PSI ensures reliable performance under heavy loads and mechanical stress.
• Quick and secure installation with external hex drive and hex head design, allowing for efficient tightening with standard tools.
• Excellent thread engagement provided by UNC coarse threading and Class 2A thread fit, reducing cross-threading risks and ensuring consistent fastening.
• Optimized for partial thread applications where unthreaded shank adds shear strength and precise clamping control.
• Compliance with Fed. Spec. FF-S-85 (MS35307-307) guarantees consistent quality and interchangeability in regulated projects.
• Environmentally safe manufacturing with RoHS 3 and REACH compliance, meeting global regulatory standards for hazardous substances.

Professional Applications & Engineering Value

This 1/4"-20 UNC hex head screw delivers exceptional engineering value in demanding applications such as machinery assembly, structural frameworks, and outdoor equipment. The passivated 18-8 stainless steel provides robust resistance to oxidation and chemical exposure, addressing common failure points in industrial settings. Its coarse thread design ensures faster installation and reliable hold in softer materials or where vibration is a concern. The partially threaded configuration offers enhanced shear resistance, making it suitable for pivoting joints or assemblies requiring a smooth shank. With a Rockwell B74 hardness and high tensile strength, it withstands repetitive stress without deformation, reducing maintenance needs and downtime in heavy-duty industrial applications.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including a Class 2A thread fit for consistent assembly and UNC coarse threading with 1/4"-20 size. It meets Fed. Spec. FF-S-85 (MS35307-307) for material and manufacturing quality. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) ensures it is free from restricted hazardous substances, supporting safe and sustainable usage in global markets.