S-91274A480 1/2"-13 x 3 1/4" ASME B18.3, ASTM A574, ASTM B117 Alloy Steel Socket Head Screws
Alloy Steel Socket Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance with zinc-flake coating, extending service life in harsh industrial environments
- Exceptional tensile strength of 170,000 PSI ensures reliable, high-load fastening for demanding applications
- Precision Class 3A thread fit guarantees consistent engagement and vibration resistance in critical assemblies
- High hardness (Rockwell C37) provides excellent wear resistance and durability under repetitive stress
- Hex socket drive design allows for high-torque installation in confined spaces with standard 3/8" tools
- Partially threaded shank offers optimal grip length control and prevents thread damage during installation
- Comprehensive regulatory compliance meets ASME B18.3, ASTM A574, RoHS 3, and REACH standards for global acceptance
Professional Applications & Engineering Value
These zinc-flake-coated alloy steel socket head cap screws deliver critical performance advantages in heavy machinery, automotive, and aerospace applications where corrosion resistance and structural integrity are paramount. The 1/2"-13 UNC coarse thread configuration ensures rapid assembly while maintaining Class 3A precision fit for vibration-prone environments. The combination of 170,000 PSI tensile strength and Rockwell C37 hardness addresses common failure points in high-stress applications, providing engineers with a reliable fastening solution that withstands extreme operational demands. The hex socket drive enables secure installation in space-constrained assemblies, making these industrial screws ideal for maintenance-critical equipment requiring frequent disassembly.
Specification Summary & Compliance
Manufactured to exacting ASME B18.3 and ASTM A574 specifications with Class 3A thread fit tolerances. Features 1/2"-13 UNC coarse threads with minimum 1-1/2" thread length on a 3-1/4" partially threaded shank. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, validated through ASTM B117 testing standards.
