S-92805A626 5/16"-18 x 1" ASME B18.3, ASTM F879, MIL-DTL-18240 Stainless Steel Thread-Locking Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Exceptional vibration resistance thanks to the nylon patch thread locker that maintains secure fastening from -65° to 250°F
• High tensile strength of 70,000 psi ensures reliable performance in demanding applications
• Precise Class 3A thread fit provides superior engagement and reduced risk of cross-threading
• Hex drive design allows for high torque application and easy installation in confined spaces
• Full threading ensures maximum grip length and uniform stress distribution
• 82° countersink angle enables flush mounting for clean, professional finishes

Professional Applications & Engineering Value

These 5/16"-18 UNC flat head screws with hex drive design solve critical industrial fastening challenges where vibration resistance and corrosion protection are paramount. The 18-8 stainless steel construction combined with Rockwell B55 hardness provides excellent durability in machinery, automotive, and marine applications. The integrated nylon patch thread locker eliminates the need for separate locking washers or adhesives, maintaining secure connections in high-vibration environments from -65° to 250°F. The coarse thread spacing and Class 3A thread fit ensure quick assembly and reliable performance in structural applications where precision and strength are critical.

Specification Summary & Compliance

Manufactured to exacting Class 3A thread tolerances with UNC coarse thread specification. Fully compliant with ASME B18.3, ASTM F879, and MIL-DTL-18240 standards. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Features include 1" length, 3/16" hex drive, and 82° countersink angle for standardized installation.