S-94414A381 5/16"-18 x 5/8" ASME B18.3, ASTM F835 Alloy Steel Torx Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide coating, ideal for harsh industrial environments
• Exceptional torque transmission via T40 Torx Plus IP40 drive, minimizing cam-out and tool wear
• High tensile strength of 140,000 psi ensures reliable performance under heavy loads
• Precise Class 3A thread fit for secure, vibration-resistant fastening in critical assemblies
• Fully threaded 5/8" length provides maximum grip and uniform clamping force
• Standard 82° countersink angle allows for flush mounting in various materials
• Rockwell C39 hardness delivers excellent durability and resistance to deformation

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 5/16"-18 UNC flat head screws with Black-Oxide Alloy Steel construction address common fastening challenges. The Torx Plus IP40 drive system prevents stripping under high torque, while the Class 3A thread fit ensures precise engagement in machinery, automotive, and heavy equipment assemblies. The combination of 140,000 psi tensile strength and corrosion-resistant coating provides long-term reliability in environments exposed to moisture and chemicals, reducing maintenance frequency and downtime.

Specification Summary & Compliance

This product features 5/16"-18 UNC coarse threads with Class 3A fit and fully threaded design. Manufactured to ASME B18.3 specifications (ASTM F835) with 82° countersink angle. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.