S-90044A237 2 1/2"-8 x 8" 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 finish on alloy steel extends service life in demanding industrial environments.
• Precise Class 2A thread fit with UN fine threads provides secure, vibration-resistant connections for critical assemblies.
• Robust 1 3/4" hex drive and standard socket head design allow for high-torque installation with standard tools, improving assembly efficiency.
• Partially threaded shank offers optimal grip length control, ideal for applications requiring precise clamping force.
• Compliance with ASTM A574 guarantees consistent quality and mechanical properties for engineering reliability.
• Rockwell C37 hardness ensures excellent wear resistance and durability under repetitive loads.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges such as joint integrity under dynamic loads and exposure to harsh conditions. The 2 1/2"-8 UN fine thread enhances fatigue resistance and provides superior holding power in machinery, heavy equipment, and structural frameworks. Its high tensile strength and Rockwell C37 hardness make it suitable for demanding applications like construction machinery, automotive assemblies, and industrial presses, where failure is not an option. The black-oxide surface treatment adds a protective layer against corrosion, reducing maintenance needs. With a 1 3/4" hex drive, it ensures easy installation even in confined spaces, streamlining maintenance and repair processes in B2B settings.

Specification Summary & Compliance

This screw features a Class 2A thread fit for precise dimensional accuracy and a UN fine thread type with a 2 1/2"-8 size. It is manufactured in accordance with ASTM A574 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory adherence for industrial use.