S-91251A924 1"-8 x 5" 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 extreme loads, reducing the risk of fastener failure in demanding applications.
- Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life and maintaining integrity in harsh industrial environments.
- High torque transmission capability with a 3/4" hex drive, allowing for secure installation and removal without stripping, even in high-vibration settings.
- Precise Class 3A thread fit provides consistent engagement and vibration resistance, minimizing loosening and ensuring long-term joint stability.
- Partially threaded design offers flexibility for clamping and alignment, ideal for applications requiring precise unthreaded shank sections.
- Rockwell C37 hardness delivers excellent wear resistance, maintaining thread integrity and dimensional accuracy through repeated use.
- Compliance with ASTM A574 and environmental regulations guarantees material quality and safe use, meeting rigorous industry and legal standards.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges, such as vibration-induced loosening and corrosion in heavy machinery. The UNRC coarse thread and Class 3A thread fit ensure quick assembly and reliable holding power, reducing maintenance downtime in equipment like presses, conveyors, and automotive systems. Its partially threaded configuration allows for precise clamping in structural joints, while the high tensile strength and Rockwell C37 hardness prevent deformation under stress. Ideal for industrial fasteners in manufacturing and construction, it combines durability with regulatory compliance for safe, efficient operations.
Specification Summary & Compliance
This fastener adheres to Class 3A thread tolerances for precise fit, with UNRC coarse thread specifications ensuring compatibility in inch-based systems. It meets ASTM A574 for material and manufacturing consistency, and is confirmed RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, supporting environmentally responsible procurement.
