S-94361A128 1/4"-28 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced Durability & Corrosion Resistance: Black oxide finish provides superior protection against rust and wear in demanding industrial environments.
• Exceptional Tensile Strength: 140,000 psi tensile strength ensures reliable performance under high-stress conditions and heavy-duty applications.
• Precision Thread Fit: Class 3A thread fit guarantees tight tolerances and secure fastening, reducing the risk of loosening in critical assemblies.
• Accurate Shoulder Alignment: 1-1/2" shoulder with controlled diameter and length tolerances provides stable bearing surfaces and precise component positioning.
• Secure & Easy Installation: Socket head with 5/32" hex drive and knurled texture allows for high-torque application and improved grip during assembly.
• Fine Thread Advantage: 1/4"-28 UNF fine thread offers better adjustment control and vibration resistance compared to coarse threads.
• Regulatory Compliance: Meets RoHS 3 and REACH standards, ensuring safe and environmentally responsible use in global markets.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical alignment and load-bearing challenges in precision machinery. The substantial 1-1/2" shoulder length acts as a precise axle or pivot point in assemblies, eliminating the need for additional spacers and reducing component count. The Class 3A thread fit ensures minimal play in high-vibration environments, making it ideal for robotics, automotive fixtures, and conveyor systems where positional accuracy is paramount. The black oxide finish enhances corrosion resistance without significantly altering dimensions, while the socket head design with knurled texture provides secure tool engagement in confined spaces. With 140,000 psi tensile strength and Rockwell C32 hardness, it maintains structural integrity under repetitive dynamic loads, offering long-term reliability in demanding industrial applications.

Specification Summary & Compliance

This shoulder screw features precision 1/4"-28 UNF fine threads with Class 3A fit for superior thread engagement. The shoulder maintains tight tolerances with diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Manufactured from alloy steel with black oxide finish, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met for industrial and export applications.