S-94173A312 5/16"-18 x 3 1/2" 12-Point Screws
12-Point Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance with black-oxide coating, extending service life in harsh industrial environments
- Exceptional 170,000 psi tensile strength and Rockwell C38 hardness for reliable performance in high-stress applications
- Optimized torque transmission via external 12-point drive, reducing tool slippage and installation time
- Enhanced load distribution from the integrated flange, minimizing surface damage and improving joint stability
- Precision Class 2A thread fit ensures smooth assembly and consistent clamping force in UNC coarse thread applications
- Versatile partial threading allows for both secure fastening and adjustable positioning in structural assemblies
- Heavy-duty alloy steel construction provides durability for demanding mechanical and equipment applications
Professional Applications & Engineering Value
This black-oxide alloy steel 12-point screw delivers critical reliability in heavy machinery, construction equipment, and automotive assemblies where vibration resistance and high torque transmission are paramount. The UNC coarse thread design prevents cross-threading in rapid assembly lines, while the partial threading and flange work synergistically to distribute clamp load evenly—reducing stress concentration on joined materials. Engineered for industrial screw applications requiring consistent 170,000 psi tensile strength, it solves common failure points in dynamic load environments, offering maintenance-free performance even under cyclic stresses.
Specification Summary & Compliance
Manufactured to Class 2A thread fit tolerances for consistent engagement, this screw conforms to UNC thread standards with 5/16"-18 coarse spacing. The black-oxide surface treatment meets industrial corrosion protection requirements, while the alloy steel composition and Rockwell C38 hardness ensure compliance with ASME and ASTM specifications for high-strength fasteners. All materials adhere to RoHS and REACH environmental directives.
