S-94173A306 1/4"-28 x 3" 12-Point Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 PSI ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in harsh industrial environments.
• Enhanced load distribution thanks to the integrated flange, which minimizes surface damage and improves joint integrity.
• Precise, fine UNF threading with Class 2A fit provides secure, vibration-resistant connections and easy assembly in precision applications.
• High hardness (Rockwell C38) offers excellent wear resistance, maintaining thread integrity through repeated use.
• External 12-point drive design allows for high-torque installation with standard tools, speeding up assembly without stripping.
• Partially threaded shank enables controlled clamping force, ideal for applications where specific unthreaded grip length is critical.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, this 12-point flanged screw in black-oxide alloy steel addresses common challenges like vibration loosening and corrosion. The 1/4"-28 UNF fine thread with Class 2A fit ensures tight, reliable fastening in machinery, automotive, and heavy equipment assemblies, where precision and durability are paramount. The flange eliminates the need for separate washers, distributing load evenly to prevent surface indentation and reduce maintenance. Its partially threaded design allows for optimal grip on materials, making it a top choice for high-strength applications requiring consistent performance and long-term reliability.

Specification Summary & Compliance

This screw adheres to UNF thread standards with a Class 2A thread fit for consistent dimensional accuracy. It meets industry specifications for alloy steel composition, supporting 170,000 PSI tensile strength and Rockwell C38 hardness. The product is manufactured in compliance with RoHS and REACH environmental directives, ensuring safe use in various sectors. Threads are right-hand and partially threaded, with a 3" length and fine thread spacing, suitable for applications governed by standards like ASME for mechanical fasteners.