S-91251A946 1"-8 x 20" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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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 hardness rating of Rockwell C37 provides excellent wear resistance and durability, extending the service life of the screw in harsh industrial environments.
- Precise Class 3A thread fit offers tighter tolerances for secure, vibration-resistant connections, minimizing loosening in critical assemblies.
- Black-oxide coating on alloy steel enhances corrosion resistance and provides a sleek finish, ideal for applications requiring both protection and aesthetics.
- Partially threaded design with UNC coarse threads allows for easier alignment and faster installation, saving time and labor costs in assembly processes.
- Hex socket drive (3/4" size) enables high-torque application with standard tools, ensuring firm installation without stripping the head.
- Compliance with ASTM A574, RoHS 3, and REACH guarantees material consistency and environmental safety, meeting global standards for industrial use.
Professional Applications & Engineering Value
This socket head cap screw is engineered from black-oxide alloy steel to address common industrial challenges such as vibration-induced loosening and corrosion in heavy machinery. The UNC coarse threading and Class 3A fit provide superior grip and alignment in high-vibration environments, making it ideal for construction equipment, automotive assemblies, and manufacturing systems. With a 20" length and partially threaded profile, it offers flexibility for applications requiring precise clamping force without compromising strength. The combination of high tensile strength and Rockwell C37 hardness ensures long-term reliability, reducing maintenance needs and downtime in critical operations.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit for precise dimensional accuracy and UNC coarse thread standards. It meets ASTM A574 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity for industrial use.
