S-94361A326 1/4"-28 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced Durability & Corrosion Resistance: Black Oxide finish provides reliable protection against rust and wear in demanding industrial environments, extending service life.
• Superior Tensile Strength for Heavy-Duty Applications: With a 140,000 psi tensile strength and Rockwell C32 hardness, this screw withstands high stress and load conditions without failure.
• Precision Thread Fit for Secure Fastening: Class 3A thread fit ensures tight, reliable connections with minimal backlash, ideal for precision assemblies.
• Knurled Head Design for Improved Grip: The knurled socket head allows for easy installation and removal with standard hex tools, reducing slippage and tool wear.
• Fine Thread Spacing for Vibration Resistance: UNF fine threads offer better resistance to loosening under vibration compared to coarse threads, maintaining joint integrity.
• Compliant with Environmental Standards: Meets RoHS 3 and REACH regulations, ensuring safe use in various industries without hazardous substances.
• Accurate Shoulder Dimensions for Alignment: Tight tolerances on shoulder diameter and length provide precise positioning and alignment in machinery and fixtures.

Professional Applications & Engineering Value

This 1/4"-28 UNF shoulder screw is engineered to address common challenges in precision machinery, automation, and assembly systems. Made from alloy steel with a Black Oxide finish, it combats corrosion and wear in harsh conditions, reducing maintenance needs. The Class 3A thread fit and fine UNF threads deliver secure, vibration-resistant fastening, crucial for applications like rotating shafts, linkages, and jigs where alignment and stability are paramount. The knurled socket head enhances tool engagement, speeding up installation in tight spaces. Ideal for industrial equipment, this screw ensures reliable performance in high-stress environments, supporting efficient production and reduced downtime.

Specification Summary & Compliance

This shoulder screw features precise dimensions, including a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005", ensuring consistent fit. It adheres to UNF thread standards with a Class 3A fit for high accuracy. The product complies with RoHS 3 (2015/863/EU) under exemption 6(a) and REACH (EC 1907/2006), confirming environmental safety. Manufactured to rigorous specifications, it meets industrial demands for strength and reliability.