S-91251A141 3/4"-10 x 9" 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 extends service life in harsh industrial environments, minimizing maintenance needs.
• Precise Class 3A thread fit provides secure, vibration-resistant connections for improved assembly integrity.
• Partially threaded design allows for controlled clamping force and easier alignment in complex machinery setups.
• High hardness (Rockwell C37) enhances wear resistance, maintaining thread integrity through repeated use.
• 5/8" hex drive compatibility enables efficient installation with standard tools, speeding up assembly processes.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety for global supply chain requirements.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in heavy-duty industrial applications, such as machinery assembly, construction equipment, and automotive systems. The UNRC coarse thread design facilitates quick installation and provides excellent grip in materials prone to vibration loosening. With a partially threaded rod type, it offers optimal stress distribution, preventing thread damage during high-torque fastening. The combination of 170,000 psi tensile strength and Rockwell C37 hardness ensures durability under dynamic loads, while the black-oxide surface treatment adds a layer of corrosion protection, making it ideal for environments exposed to moisture or chemicals. These features collectively enhance operational reliability, reduce downtime, and support long-term performance in demanding engineering projects.

Specification Summary & Compliance

This socket head cap screw adheres to Class 3A thread fit for precise dimensional accuracy and features a 3/4"-10 UNRC coarse thread with a minimum thread length of 2 inches. Manufactured in compliance with ASTM A574 specifications, it ensures consistent material and mechanical properties. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety standards for industrial use.