S-91251A099 5/16"-18 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 corrosion resistance with black-oxide coating, ideal for harsh industrial environments
- Superior tensile strength of 170,000 PSI ensures reliable performance under high-stress conditions
- Precision Class 3A thread fit provides secure, vibration-resistant fastening in critical assemblies
- Rockwell C37 hardness rating delivers excellent wear resistance and long service life
- Coarse UNC threading enables quick installation and reduced cross-threading risks
- Hex socket drive design allows high torque application with standard 1/4" hex keys
- Comprehensive compliance with ASTM A574, RoHS 3, and REACH standards for quality assurance
Professional Applications & Engineering Value
These black-oxide alloy steel socket head cap screws deliver exceptional engineering value in demanding applications where corrosion resistance and high strength are critical. The UNC coarse threading combined with Class 3A precision thread fit ensures reliable performance in vibrating environments, preventing loosening in machinery, automotive assemblies, and heavy equipment. The partially threaded design provides optimal clamping force distribution, while the hex socket drive enables high-torque installation in confined spaces. With 170,000 PSI tensile strength and Rockwell C37 hardness, these industrial fasteners maintain integrity under extreme loads, making them ideal for construction equipment, manufacturing machinery, and aerospace applications where failure is not an option.
Specification Summary & Compliance
This 5/16"-18 UNC socket head cap screw features precise Class 3A thread fit with coarse thread spacing and 1-1/8" minimum thread length. Manufactured to ASTM A574 specifications with dimensional accuracy and mechanical properties verified. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance for industrial applications worldwide.
