S-91251A381 5/16"-24 x 3/4" 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 industrial environments
• Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress applications
• Precision Class 3A thread fit provides secure fastening with minimal backlash in critical assemblies
• Fine UNF thread profile offers improved vibration resistance and better load distribution
• Standard hex socket drive allows for high-torque installation with common industrial tools
• Full threading along 3/4" length enables flexible positioning and maximum grip range
• Rockwell C37 hardness maintains dimensional stability under repeated loading cycles

Professional Applications & Engineering Value

These black-oxide alloy steel socket head cap screws deliver critical performance advantages in precision machinery, automotive systems, and heavy equipment applications. The 5/16"-24 UNF fine thread configuration provides superior resistance to vibrational loosening while maintaining clamp force integrity. Engineered with Class 3A thread tolerance, these fasteners ensure precise fitment in high-precision assemblies where minimal clearance is paramount. The fully threaded design accommodates varying material thicknesses without compromising joint integrity. Ideal for industrial applications requiring both corrosion protection and high tensile strength, these screws prevent galvanic corrosion while withstanding extreme mechanical stresses.

Specification Summary & Compliance

Manufactured to ASTM A574 specifications with Class 3A thread fit precision and UNF fine thread standards. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features include 0.3125" thread diameter, 1/4" hex drive, and right-hand thread direction for standardized installation procedures.