S-91251A001 7/16"-20 x 1" 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.
• Precision Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in critical assemblies.
• Black-oxide finish on alloy steel offers enhanced corrosion resistance, extending service life in harsh industrial environments.
• Fine UNF threads (7/16"-20) deliver improved clamping force and finer adjustment capabilities compared to coarse threads.
• Fully threaded design allows for maximum grip length and flexibility in various material thicknesses.
• High hardness (Rockwell C37) provides excellent wear resistance, maintaining thread integrity through repeated use.
• 3/8" hex drive socket head enables high-torque installation with standard tools, speeding up assembly processes.

Professional Applications & Engineering Value

Engineered for demanding industrial applications, this black-oxide alloy steel socket head cap screw delivers critical performance advantages where reliability is paramount. The combination of 170,000 psi tensile strength and Rockwell C37 hardness ensures exceptional load-bearing capacity in heavy machinery, automotive systems, and precision equipment. The 7/16"-20 UNF fine threads with Class 3A fit provide superior vibration resistance in dynamic applications, preventing costly downtime from loosened connections. The black-oxide surface treatment creates a protective barrier against corrosion while maintaining dimensional stability. These fully threaded fasteners are ideal for applications requiring consistent clamping force across varying material thicknesses, making them essential components in manufacturing, aerospace, and industrial automation where precision and durability are non-negotiable.

Specification Summary & Compliance

This socket head cap screw maintains precision Class 3A thread fit according to UNF standards, ensuring exact dimensional accuracy for critical assemblies. Manufacturing specifications comply with ASTM A574 for high-strength alloy steel socket head cap screws. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting the latest industry standards for hazardous substance restrictions and chemical safety.