S-91253A345 5/16"-24 x 1 3/4" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with Black-Oxide finish, ideal for harsh industrial environments
• Superior thread engagement with Class 3A fit for reliable, vibration-resistant assemblies
• High tensile strength (130,000 psi) ensures dependable performance under heavy loads
• Precision hex drive (3/16") allows for secure installation with standard tools
• Optimized 82° countersink angle provides flush mounting in various materials
• Full threading along 1 3/4" length delivers maximum grip and load distribution
• Compliance with major standards including ASTM F835, RoHS 3, and REACH for global acceptance

Professional Applications & Engineering Value

These 5/16"-24 UNF flat head screws are engineered to address critical challenges in industrial assembly where vibration resistance, material compatibility, and long-term reliability are paramount. The Black-Oxide Alloy Steel construction provides enhanced corrosion protection without sacrificing the 130,000 psi tensile strength and Rockwell C39 hardness, making them suitable for demanding applications in machinery, automotive, and heavy equipment. The Class 3A thread fit and fine thread spacing ensure precise, secure fastening in high-stress environments, while the fully threaded design and 82° countersink allow for uniform load distribution and seamless surface integration. These features collectively reduce maintenance frequency and improve assembly integrity in industrial screw applications.

Specification Summary & Compliance

This product features precision 5/16"-24 UNF threads with Class 3A fit and fine thread spacing, manufactured to ASTM F835 specifications. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met for global industrial use.