S-92245A939 1/4"-28 x 3" FF-S-85, MS35308-318 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
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B74 hardness for reliable load-bearing performance
• Precision threading with Class 2A fit and UNF fine thread spacing ensuring secure, vibration-resistant connections
• Optimized installation efficiency featuring external hex drive and standard hex head for easy tool engagement and torque application
• Enhanced design flexibility with partially threaded shank allowing for precise clamping force distribution
• Regulatory compliance assurance meeting Fed. Spec. FF-S-85 (MS35308-318), RoHS 3, and REACH standards for global market acceptance
• Long-term reliability with right-hand thread direction and fine thread spacing maintaining joint integrity under dynamic loads

Professional Applications & Engineering Value

This 1/4"-28 UNF hex head screw delivers critical engineering solutions where corrosion resistance and mechanical reliability are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against oxidation and chemical exposure, making it ideal for marine, chemical processing, and outdoor equipment applications. The partially threaded design with 3/4" minimum thread length allows for precise unthreaded shank sections that resist shear forces while the fine thread spacing creates superior vibration resistance in dynamic assemblies. With its external hex drive and standard hex head profile, installation teams benefit from rapid deployment using common tools, reducing assembly time while maintaining 70,000 psi tensile strength performance. These industrial screws effectively address common fastener failure points including thread stripping, corrosion-induced degradation, and installation inefficiencies.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerances and UNF thread specifications. This fastener complies with Fed. Spec. FF-S-85 (MS35308-318) manufacturing requirements and demonstrates full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The inch system measurements ensure compatibility with North American equipment and replacement part specifications.