S-90044A187 7/16"-20 x 4 1/4" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Superior corrosion resistance from the black-oxide finish on alloy steel prolongs service life in harsh industrial environments, minimizing maintenance needs.
• Precise Class 3A thread fit with 7/16"-20 UNF fine threads provides secure, vibration-resistant connections for critical assemblies.
• High hardness rating (Rockwell C37) enhances wear resistance, maintaining thread integrity through repeated use and high torque applications.
• Partially threaded design allows for controlled clamping force, ideal for components requiring precise alignment and reduced thread galling.
• Standard hex socket drive (3/8") enables easy installation in confined spaces with common tools, improving assembly efficiency.
• Compliance with ASTM A574 guarantees consistent quality and mechanical properties, ensuring reliability for engineering and manufacturing uses.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address common industrial challenges such as vibration loosening, corrosion, and high-load demands. The 7/16"-20 UNF fine thread with Class 3A fit ensures tight, precise fastening in machinery, automotive, and aerospace assemblies, where tolerance control is critical. The alloy steel construction, combined with a black-oxide surface treatment, provides durability against environmental exposure, making it suitable for outdoor or chemically aggressive settings. Its partially threaded rod type allows for optimal stress distribution, reducing the risk of fatigue in dynamic applications. Ideal for use in heavy-duty equipment, precision instruments, and structural frameworks, this fastener delivers long-term reliability and performance consistency.

Specification Summary & Compliance

This product meets ASTM A574 specifications for high-strength socket head cap screws, with precise Class 3A thread fit and UNF fine threads (7/16"-20) ensuring dimensional accuracy. It is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and environmentally responsible industrial practices. The screw features a 4 1/4" length with a minimum thread length of 1 5/8", and is manufactured to maintain consistent Rockwell C37 hardness and 170,000 psi tensile strength.