S-94173A329 7/16"-14 x 4" 12-Point Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance from the black-oxide finish, extending service life in harsh industrial environments.
• Superior high-torque capability with the external 12-point drive and head, allowing for secure tightening in high-stress applications.
• Reliable load-bearing performance due to the alloy steel construction and a tensile strength of 170,000 PSI.
• Enhanced joint stability provided by the integrated flange, which distributes clamping force and acts as a built-in washer.
• Optimized for rapid assembly with coarse UNC threading and a Class 2A thread fit, ensuring easy starts and consistent engagement.
• Versatile partial threading design that allows for unthreaded shank strength where needed, ideal for shear-critical connections.
• Durable wear resistance from a Rockwell C38 hardness, maintaining thread integrity and head drive features through repeated use.

Professional Applications & Engineering Value

This 12-point screw is engineered to solve critical fastening challenges in heavy machinery, structural steel frameworks, and high-vibration equipment. The black-oxide alloy steel construction provides a robust barrier against rust and oxidation, crucial for outdoor or chemically exposed settings. Its 7/16"-14 UNC coarse thread and Class 2A thread fit ensure quick, reliable installation with reduced risk of cross-threading, while the partially threaded design offers a non-threaded shank section that enhances shear strength in bolted joints. The external 12-point drive and flanged head work together to deliver high clamp load distribution, preventing loosening under dynamic loads. This makes it an indispensable heavy-duty fastener for industries demanding precision, strength, and long-term reliability.

Specification Summary & Compliance

This screw conforms to UNC thread standards with a Class 2A thread fit for consistent, free-spinning assembly. Key dimensional specifications include a 7/16"-14 thread size with coarse spacing, a 4" length, and a 0.75" flange diameter. The manufacturing utilizes alloy steel heat-treated to a Rockwell C38 hardness and a tensile strength of 170,000 psi. The product is compliant with industry standards for material composition and is produced in accordance with ASME and other relevant mechanical fastening specifications, ensuring reliability in critical applications.