S-91251A074 1/2"-20 x 1 3/8" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in harsh environments
• Exceptional tensile strength of 170,000 psi for reliable performance in high-stress applications
• Precise Class 3A thread fit ensures secure, vibration-resistant connections
• Rockwell C37 hardness provides excellent wear resistance and durability
• 3/8" hex drive design allows for easy installation with standard tools
• Fully threaded body offers maximum grip length and uniform load distribution
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these black-oxide alloy steel socket head cap screws deliver outstanding performance in machinery, automotive, and heavy equipment assemblies. The 1/2"-20 UNF fine thread configuration provides superior clamping force and vibration resistance, crucial for dynamic load applications. With 170,000 psi tensile strength and Rockwell C37 hardness, these fasteners maintain integrity under extreme stress while the black-oxide surface treatment offers enhanced corrosion protection. The 3/8" hex drive socket enables precise torque application in confined spaces, making them ideal for precision engineering applications requiring reliable, high-strength fastening solutions.

Specification Summary & Compliance

This socket head cap screw features Class 3A thread fit with 1/2"-20 UNF fine threads and 1 3/8" length in inch system measurements. Manufactured to ASTM A574 specification for high-strength alloy steel socket head cap screws. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.