S-91251A061 3/4"-10 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 in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish prolongs service life in demanding industrial environments.
• Precise Class 3A thread fit provides excellent engagement and vibration resistance for secure, long-lasting assemblies.
• High hardness rating (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
• 5/8" hex drive design allows for high torque application and easy installation in confined spaces.
• Coarse UNRC threads enable quick assembly and reduced cross-threading risks, improving installation efficiency.
• Compliance with RoHS 3 and REACH regulations ensures environmental safety and global market acceptance.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw delivers exceptional engineering value through its robust material composition and precision manufacturing. The ASTM A574 specification guarantees consistent quality and performance in critical applications where failure is not an option. The partially threaded design with 2" minimum thread length provides optimal clamping force distribution while the coarse 3/4"-10 UNRC threads resist loosening under vibration - a common challenge in heavy machinery, automotive, and construction equipment. The black-oxide surface treatment creates a protective barrier against corrosion without significantly increasing dimensions, making these socket head cap screws ideal for precision assemblies where clearance is limited. These characteristics make them particularly valuable for industrial applications requiring both high strength and reliable performance in challenging operating conditions.

Specification Summary & Compliance

This socket head cap screw features precision Class 3A thread fit with 3/4"-10 UNRC coarse threads and right-hand thread direction. The fastener meets ASTM A574 specification for high-strength alloy steel socket head cap screws, ensuring consistent mechanical properties and dimensional accuracy. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental responsibility and suitability for international markets. The product maintains Rockwell C37 hardness and 170,000 psi tensile strength as specified, with a partially threaded rod type and standard socket head profile for uniform performance across applications.