S-91251A040 3/4"-16 x 8" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating for extended service life in demanding environments
• Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress conditions
• Precision Class 3A thread fit provides superior engagement and vibration resistance in critical assemblies
• Optimal hardness rating of Rockwell C37 balances strength with machinability for versatile applications
• Deep hex socket drive (5/8") enables high-torque installation without stripping or cam-out
• Partially threaded design allows for precise clamping force control in structural connections
• Regulatory compliance with RoHS 3 and REACH ensures environmental responsibility in global supply chains

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw delivers critical performance advantages for heavy-duty industrial applications. The 3/4"-16 UNRF fine thread configuration with Class 3A fit provides exceptional resistance to vibrational loosening in machinery, construction equipment, and automotive assemblies. The partially threaded shank design concentrates clamping force precisely where needed, while the 170,000 psi tensile strength ensures structural integrity in high-load scenarios. The corrosion-resistant black-oxide surface treatment extends service life in harsh operating environments, making these socket head cap screws ideal for applications requiring both mechanical reliability and environmental durability.

Specification Summary & Compliance

Manufactured to ASTM A574 specifications with Class 3A thread tolerance for precision fit. Features UNRF fine threads (3/4"-16) with 2" minimum thread length on an 8" partially threaded shank. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Standard hex socket drive (5/8") accommodates high-torque installation tools.