S-94414A583 5/16"-18 x 1/2" ASME B18.3, ASTM F835 Alloy Steel Torx Flat Head Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with black-oxide coating, ideal for industrial environments
• Superior torque transmission via Torx Plus IP40 drive, reducing cam-out and tool wear
• High tensile strength (140,000 psi) and Rockwell C39 hardness for demanding applications
• Precise Class 3A thread fit ensures secure fastening and vibration resistance
• 82° countersink angle provides flush mounting in standard recessed surfaces
• Fully threaded design offers maximum grip length and load distribution
• Compliance with ASME B18.3 and ASTM F835 guarantees consistent quality and reliability

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these 5/16"-18 UNC flat head screws with Torx Plus drive address critical challenges in machinery assembly, automotive components, and structural frameworks. The black-oxide alloy steel construction combats rust and wear in harsh conditions, while the Class 3A thread fit and coarse thread spacing enable rapid installation with minimal cross-threading risks. The fully threaded design and 82° countersink ensure uniform stress distribution and seamless surface integration, making them ideal for high-vibration environments where fastener integrity is paramount.

Specification Summary & Compliance

This screw features a 5/16"-18 UNC thread with Class 3A precision fit and coarse thread spacing for reliable engagement. Manufactured to ASME B18.3 and ASTM F835 standards, it ensures dimensional accuracy and performance consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible sourcing and usage in global markets.