S-91251A492 8-36 x 5/16" 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 industrial applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish on alloy steel extends service life in demanding environments, minimizing maintenance needs.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, enhancing joint integrity.
• Fine UNF threading offers improved load distribution and better sealing capabilities compared to coarse threads, ideal for precision equipment.
• Full threading design allows for consistent engagement along the entire length, enabling flexible installation and adjustable clamping force.
• High hardness (Rockwell C37) resists wear and deformation during repeated use, ensuring long-term durability.
• Standard hex drive compatibility with a 9/64" key facilitates easy installation and removal with common tools, saving time on assembly lines.

Professional Applications & Engineering Value

This 8-36 UNF socket head cap screw is engineered to address critical fastening challenges in industrial settings, where vibration, high loads, and environmental factors can compromise joint reliability. The black-oxide alloy steel construction combats rust and oxidation, making it suitable for machinery, automotive components, and precision instruments exposed to moisture or chemicals. With its fine thread and Class 3A fit, it delivers superior clamping force and resistance to loosening under dynamic stresses, reducing downtime in manufacturing and assembly operations. The fully threaded design ensures uniform stress distribution, while the socket head allows for compact installations in confined spaces, providing engineers with a versatile, high-strength solution for demanding applications.

Specification Summary & Compliance

This screw adheres to inch system dimensions with a Class 3A thread fit for precise UNF fine threading, ensuring tight tolerances per industry standards. It meets ASTM A574 specifications for high-strength socket head cap screws, guaranteeing material and performance consistency. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in regulated environments without hazardous substances.