S-91274A199 1"-8 x 4" ASME B18.3, ASTM A574, ASTM B117 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.
- Superior corrosion resistance from the zinc-flake coating protects against harsh industrial environments, extending service life.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies in critical applications.
- High hardness (Rockwell C37) offers excellent wear resistance, maintaining integrity through repeated use and disassembly.
- 3/4" hex drive design allows for high torque application, enabling efficient installation and removal with standard tools.
- Partially threaded shank provides optimal grip and clamping force where needed, improving joint stability.
- Compliance with major standards including ASME B18.3 and ASTM A574 guarantees consistent quality and interoperability.
Professional Applications & Engineering Value
This 1"-8 UNC Socket Head Cap Screw is engineered for demanding industrial applications where reliability is critical. The zinc-flake-coated alloy steel construction provides superior protection against corrosion and chemical exposure, making it ideal for outdoor machinery, automotive assemblies, and heavy equipment. The coarse UNC thread and Class 3A fit ensure quick assembly and high vibration resistance, reducing maintenance needs in dynamic environments. With a 170,000 psi tensile strength and Rockwell C37 hardness, it withstands extreme loads and repetitive stress, preventing stripping and deformation. The 3/4" hex drive facilitates easy installation in confined spaces, enhancing productivity in manufacturing and repair operations.
Specification Summary & Compliance
This screw features a 1"-8 UNC coarse thread with Class 3A precision fit, ensuring tight tolerances and reliable engagement. It meets ASME B18.3 for dimensional consistency and ASTM A574 for material quality, with corrosion testing per ASTM B117. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible sourcing and use in global markets.
