S-91251A600 5/16"-18 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
- Exceptional tensile strength of 170,000 PSI ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in demanding industrial environments.
- Precision Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies with minimal backlash.
- Hex socket drive design allows for high torque application and easy installation in confined spaces, improving assembly efficiency.
- Partially threaded shank offers optimal grip and clamping force control, ideal for materials requiring precise joint compression.
- Compliance with ASTM A574, RoHS 3, and REACH guarantees material consistency and environmental safety for global supply chain use.
- Coarse UNC thread spacing enables quicker installation and better performance in softer materials or where debris resistance is needed.
Professional Applications & Engineering Value
These 5/16"-18 UNC socket head cap screws are engineered to address critical challenges in heavy machinery, automotive, and aerospace assemblies where high tensile strength and corrosion resistance are paramount. The black-oxide alloy steel construction, combined with a Rockwell C37 hardness, ensures durability against wear and environmental exposure, reducing maintenance cycles. The hex drive and partially threaded design facilitate secure fastening in tight spaces, preventing loosening under dynamic loads. Ideal for industrial fasteners in equipment requiring Class 3A thread fit, they deliver consistent performance in applications demanding precision and reliability, such as engine components or structural frameworks, while meeting strict ASTM A574 specifications for quality assurance.
Specification Summary & Compliance
This product adheres to Class 3A thread fit for precise dimensional accuracy under UNC coarse thread standards, with a minimum thread length of 1 1/8". Manufacturing complies with ASTM A574 for material integrity, and it is verified as RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring no hazardous substances and alignment with international environmental regulations.
