S-91251A909 1"-8 x 1 1/2" 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.
• Black-oxide coating on alloy steel provides enhanced corrosion resistance, extending service life in harsh industrial environments.
• Precision Class 3A thread fit guarantees secure, vibration-resistant connections, minimizing loosening in dynamic operations.
• 3/4" hex drive and standard socket head allow for easy installation and high torque application with common tools, improving assembly efficiency.
• Fully threaded design with coarse UNRC threads enables quick engagement and strong holding power across the entire length.
• Rockwell C37 hardness offers excellent durability and wear resistance, maintaining integrity under repeated use.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety, meeting global industry standards.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in heavy-duty industrial settings, such as machinery assembly, automotive systems, and construction equipment. Its 1"-8 coarse UNRC thread and fully threaded rod design provide rapid installation and robust clamping force, reducing assembly time while preventing joint failure under extreme loads. The Class 3A thread fit ensures precise alignment and resistance to vibration, a common issue in dynamic applications. Combined with the corrosion-resistant black-oxide surface treatment, this fastener delivers long-term reliability in environments exposed to moisture and chemicals, minimizing maintenance needs and downtime for B2B clients.

Specification Summary & Compliance

This socket head cap screw adheres to strict dimensional and performance criteria, including a Class 3A thread fit for superior accuracy and a coarse UNRC thread type with 1"-8 size. Manufactured in accordance with ASTM A574 specifications, it guarantees consistent quality and high tensile strength. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety standards for industrial use worldwide.