S-92805A624 5/16"-18 x 3/4" ASME B18.3, ASTM F879, MIL-DTL-18240 Stainless Steel Thread-Locking Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Permanent vibration resistance with nylon patch thread locker that maintains secure fastening from -65° to 250° F
• Superior corrosion resistance thanks to 18-8 stainless steel construction, ideal for harsh industrial environments
• Maximum thread engagement reliability with Class 3A thread fit ensuring precise, secure connections in critical assemblies
• High-strength performance delivering 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
• Secure installation and removal through hex drive design providing superior torque transmission and slip resistance
• Optimized flush mounting with standard 82° countersink angle and flat head profile for smooth surface finishes
• Enhanced assembly efficiency with coarse UNC threads enabling quicker installation in various materials

Professional Applications & Engineering Value

This 18-8 stainless steel flat head screw with nylon patch locking technology addresses critical vibration-induced loosening in industrial equipment, machinery, and structural assemblies. The Class 3A thread fit ensures exceptional dimensional accuracy for reliable performance in high-stress environments, while the hex drive design prevents cam-out during installation. The combination of 70,000 psi tensile strength and coarse UNC threads provides superior holding power in metals, plastics, and composite materials. Ideal for permanent fastening applications in automotive, aerospace, and heavy equipment where vibration resistance and corrosion protection are essential, this fully threaded screw delivers long-term reliability with its nylon patch thread locker maintaining consistent clamping force across temperature variations.

Specification Summary & Compliance

Manufactured to Class 3A thread fit tolerances with 5/16"-18 UNC coarse threads and 82° countersink angle. Complies with ASME B18.3, ASTM F879, and MIL-DTL-18240 specifications. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Features fully threaded design with right-hand thread direction and 0.313" thread diameter.