S-94361A127 1/4"-28 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced Durability - Alloy steel construction with Rockwell C32 hardness and 140,000 psi tensile strength ensures long-lasting performance in demanding industrial environments
• Precision Thread Fit - Class 3A thread tolerance provides superior mating accuracy and reliable fastening in critical applications
• Superior Corrosion Protection - Black oxide finish offers excellent resistance to rust and oxidation, extending service life
• Secure Installation - Knurled socket head with 5/32" hex drive prevents tool slippage and ensures consistent torque application
• Accurate Shoulder Alignment - Tight diameter tolerance (-0.004" to -0.002") and length tolerance (-0.005" to 0.005") maintain precise component positioning
• Fine Thread Advantage - 1/4"-28 UNF fine threads deliver better vibration resistance and improved load distribution
• Regulatory Compliance - Meets RoHS 3 and REACH environmental standards for global industrial applications

Professional Applications & Engineering Value

This alloy steel shoulder screw delivers exceptional engineering value in precision machinery and industrial equipment where component alignment and vibration resistance are critical. The Class 3A thread fit ensures minimal play and superior mating accuracy in assemblies requiring exact positioning, while the black oxide finish provides reliable corrosion protection in challenging environments. The knurled socket head design prevents tool slippage during installation, reducing the risk of damage to critical components. With its 1/4"-28 UNF fine threads, this shoulder screw offers enhanced vibration resistance compared to coarse threads, making it ideal for rotating assemblies, precision instruments, and automated equipment where maintaining alignment under dynamic loads is essential. The combination of 140,000 psi tensile strength and precise shoulder dimensions ensures reliable performance in demanding industrial fastening applications.

Specification Summary & Compliance

This precision shoulder screw features Class 3A thread fit with UNF fine thread standards, maintaining exacting dimensional tolerances for shoulder diameter (-0.004" to -0.002") and length (-0.005" to 0.005"). Manufactured from high-strength alloy steel with Rockwell C32 hardness, the component complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial applications requiring strict material compliance and precision engineering standards.