S-94361A126 1/4"-28 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity - With 140,000 psi tensile strength and Rockwell C32 hardness, this shoulder screw withstands high-stress applications without deformation, ensuring long-term reliability.
• Precision Thread Fit for Secure Assembly - Class 3A thread fit provides tighter tolerances than standard fits, reducing backlash and vibration in precision machinery and equipment.
• Superior Corrosion Resistance - Black oxide finish creates a protective barrier against rust and oxidation, extending service life in demanding industrial environments.
• Optimized Anti-Rotation Design - Knurled head texture provides enhanced grip during manual installation and prevents slipping when using tools, improving assembly efficiency.
• High-Torque Installation Capability - 5/32" hex socket drive allows for secure tool engagement and higher torque application compared to standard screw heads, reducing strip-out risk.
• Accurate Component Alignment - Precision-machined 1" shoulder with tight diameter tolerance ensures proper part positioning and eliminates misalignment in assemblies.
• Regulatory Compliance Assurance - Meets RoHS 3 and REACH environmental standards, making it suitable for global industrial applications without compliance concerns.

Professional Applications & Engineering Value

This alloy steel shoulder screw with 1/4"-28 UNF fine threads and Class 3A fit addresses critical alignment and vibration challenges in precision assemblies. The black oxide finish provides essential corrosion protection for industrial environments where moisture or chemicals are present. The knurled socket head combined with hex drive compatibility ensures secure tool engagement during high-torque installations, preventing damage to the drive system. The precision-machined shoulder maintains exact component spacing in machinery, automotive, and aerospace applications where dimensional accuracy is paramount. With its high tensile strength and fine thread configuration, this fastener delivers reliable performance in rotating assemblies, pivot points, and precision guides where vibration resistance and positional accuracy are critical engineering requirements.

Specification Summary & Compliance

This shoulder screw maintains Class 3A thread fit per UNF standards with precise shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". Manufactured to industry standards for shoulder screws with right-hand UNF fine threads. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and global market acceptance.