S-91251A313 7/8"-14 x 4" 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
- Maximum load-bearing capacity with 170,000 psi tensile strength and Rockwell C37 hardness for reliable performance in high-stress applications.
- Enhanced corrosion resistance from the black-oxide finish, extending service life in demanding industrial environments.
- Precise thread engagement with Class 3A thread fit and UNRF fine pitch, ensuring secure, vibration-resistant connections.
- Efficient installation and removal using a standard 3/4" hex drive, compatible with common industrial tools.
- Optimized thread design with partial threading and 2 1/4" minimum thread length for controlled clamping force and reduced weight.
- Compliance with rigorous standards including ASTM A574, RoHS 3, and REACH, guaranteeing material quality and environmental safety.
- Durable alloy steel construction providing consistent strength and fatigue resistance under repetitive loads.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial assemblies, these black-oxide alloy steel socket head cap screws address critical challenges in machinery, automotive, and construction sectors. The Class 3A thread fit and UNRF fine pitch deliver superior clamping force and vibration resistance, preventing loosening in dynamic environments. With a 170,000 psi tensile strength and corrosion-resistant coating, they excel in high-torque applications where reliability is paramount. The partially threaded design allows precise load distribution, reducing stress concentration. Ideal for securing structural components, these socket screws ensure long-term integrity in rigorous operating conditions, supported by compliance with ASTM A574 and environmental regulations.
Specification Summary & Compliance
This socket head cap screw adheres to inch system dimensions, featuring a 7/8"-14 UNRF thread with Class 3A thread fit for precise tolerance. Manufacturing follows ASTM A574 specifications, ensuring material consistency and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), meeting environmental and safety standards for industrial use.
