S-91251A634 3/8"-16 x 2 1/2" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 PSI ensures reliable performance in high-stress applications, reducing the risk of fastener failure
• Superior corrosion resistance from the black-oxide coating extends service life in demanding industrial environments
• Precision Class 3A thread fit provides consistent engagement and vibration resistance for secure assemblies
• High hardness rating (Rockwell C37) maintains thread integrity and prevents stripping during repeated installations
• Hex socket drive design allows for high torque application and access in confined spaces
• Compliance with international standards including ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety
• Partially threaded configuration offers optimal clamping force distribution for precise joint control

Professional Applications & Engineering Value

These black-oxide alloy steel socket head cap screws deliver critical performance advantages in demanding industrial applications where mechanical reliability is paramount. The combination of 170,000 PSI tensile strength and Rockwell C37 hardness provides exceptional resistance to shear forces and thread deformation, making them ideal for heavy machinery, automotive assemblies, and precision equipment. The 3/8"-16 UNC coarse thread configuration ensures rapid installation and superior vibration resistance, while the black-oxide surface treatment creates a protective barrier against corrosion in harsh operating environments. Engineered with Class 3A thread fit precision, these fasteners maintain consistent clamping force in high-cycle applications, reducing maintenance requirements and downtime in production facilities.

Specification Summary & Compliance

This socket head cap screw features precision Class 3A thread fit with 3/8"-16 UNC coarse threads and right-hand thread direction. Manufactured to ASTM A574 specification with Rockwell C37 hardness and 170,000 PSI tensile strength. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors. Dimensions include 2-1/2" length with 1-1/4" minimum thread length and 5/16" hex drive size for standardized tool compatibility.