S-91249A383 5/16"-18 x 1/2" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coated 18-8 stainless steel construction, ideal for humid or chemically aggressive environments
• High tensile strength of 70,000 psi ensures reliable performance under heavy loads and vibration, reducing failure risks
• Full threading along the entire 1/2" length provides maximum grip and uniform stress distribution in assembled components
• Coarse UNC thread design enables quick installation and reduced cross-threading in various materials
• Pan head with Phillips No. 4 drive offers a balanced combination of aesthetic appeal and secure torque application
• Compliance with ASME B18.6.3 standards guarantees dimensional accuracy and interchangeability in professional applications
• RoHS 3 and REACH compliance ensures environmental safety and regulatory acceptance in global markets

Professional Applications & Engineering Value

These 5/16"-18 UNC coarse thread screws are engineered with black-oxide 18-8 stainless steel to address common industrial challenges like corrosion, mechanical stress, and assembly efficiency. The pan head design with Phillips No. 4 drive ensures easy installation in tight spaces while maintaining a low profile for aesthetic-sensitive applications. Fully threaded and built to 70,000 psi tensile strength, they provide consistent clamping force in machinery, electrical enclosures, and automotive assemblies, minimizing loosening from vibrations. The Class 2A thread fit and coarse pitch enable rapid fastening in sheet metal, plastics, and wooden structures, reducing labor time and improving production throughput in manufacturing and maintenance operations.

Specification Summary & Compliance

This screw features a 5/16"-18 UNC coarse thread with Class 2A tolerance for precise fit, a head diameter of 0.615", and overall length of 1/2". Manufacturing adheres to ASME B18.6.3 specifications, ensuring dimensional consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and suitable for international industrial use.