S-91251A708 1/2"-13 x 5/8" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under extreme mechanical loads
• Superior corrosion resistance from black-oxide coating extends service life in demanding industrial environments
• Precision Class 3A thread fit provides secure, vibration-resistant connections with minimal backlash
• 3/8" hex drive design enables high-torque installation with standard tools while preventing cam-out
• Fully threaded construction offers maximum engagement flexibility across various material thicknesses
• Coarse UNC threading facilitates quick assembly and reduces cross-threading risks in production environments
• Rockwell C37 hardness rating maintains dimensional stability and thread integrity through repeated use

Professional Applications & Engineering Value

Engineered for high-stress industrial applications, these socket head cap screws deliver exceptional performance in machinery assembly, heavy equipment manufacturing, and structural frameworks. The black-oxide alloy steel construction provides superior corrosion protection while maintaining the 170,000 psi tensile strength required for critical connections. The 1/2"-13 UNC coarse thread design ensures rapid installation in production lines while the Class 3A thread fit guarantees precise engagement in tapped holes. These fully threaded fasteners are particularly valuable in applications requiring adjustable clamping force or where vibration resistance is paramount, making them ideal for automotive, aerospace, and industrial machinery sectors where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to ASTM A574 specifications with Class 3A thread tolerance for precision fit. Features 1/2"-13 UNC coarse threads with right-hand orientation and standard socket head profile. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The black-oxide surface treatment provides consistent corrosion protection while maintaining dimensional accuracy across all critical parameters including head diameter (3/4"), length (5/8"), and drive size (3/8" hex).