S-91864A083 4-48 x 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 demanding industrial environments
• Exceptional tensile strength (170,000 psi) ensures reliable performance under high-stress applications
• Precision Class 3A thread fit provides secure, vibration-resistant fastening with minimal play
• Fine UNF thread spacing delivers enhanced clamping force and superior load distribution
• Fully threaded design allows maximum grip length and consistent engagement across applications
• Hardened alloy steel construction (Rockwell C37) maintains dimensional stability under repeated use
• Compact hex socket drive (3/32") enables easy installation in confined spaces with standard tools

Professional Applications & Engineering Value

These black-oxide alloy steel socket head cap screws with 4-48 UNF fine threads solve critical fastening challenges in precision assemblies. The Class 3A thread fit eliminates backlash in vibration-prone equipment, while the fully threaded design ensures uniform stress distribution across joint interfaces. Engineered for industrial applications requiring high clamp load retention, these screws prevent loosening in machinery, automotive components, and electronic enclosures. The black-oxide surface treatment provides corrosion protection without dimensional interference, making them ideal for OEM applications where ASTM A574 compliance and material traceability are mandatory.

Specification Summary & Compliance

Manufactured to Class 3A thread fit tolerances with UNF fine thread specifications (4-48). Meets ASTM A574 manufacturing standards for socket head cap screws. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Right-hand thread orientation with standard socket head profile and 3/32" hex drive configuration.