S-90807A139 3/8"-16 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, reducing the risk of fastener failure.
• Precision Thread Fit: Class 3A thread fit guarantees tighter tolerances for secure, vibration-resistant assemblies in critical applications.
• Secure & Easy Installation: Knurled socket head with hex drive prevents tool slippage and allows for high-torque installation with standard tools.
• Accurate Alignment & Pivot Function: The 2" shoulder length with controlled diameter tolerance provides a precise bearing surface for rotating parts and components.
• High Material Hardness: Rockwell C32 hardness in alloy steel offers excellent wear resistance and maintains dimensional stability.
• Global Compliance Ready: Meets RoHS 3 and REACH regulations, ensuring suitability for international markets and environmentally conscious industries.

Professional Applications & Engineering Value

This shoulder screw is engineered to solve common alignment and pivot challenges in machinery assembly. The alloy steel construction and black oxide finish combat corrosion, extending service life in humid or abrasive settings. The 2" shoulder length acts as a precise datum for rotating components like gears, linkages, and pulleys, eliminating misalignment and reducing wear on mating parts. The 3/8"-16 UNC coarse threads and Class 3A fit ensure quick assembly with high clamping force, vital for maintaining integrity in vibrating equipment. Its knurled socket head design enhances grip during installation, preventing cam-out and streamlining maintenance in tight spaces. Ideal for automotive jigs, conveyor systems, and packaging machinery, this screw delivers reliable performance where precision and strength are non-negotiable.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for precision. The shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005", ensuring exacting dimensional control. Manufactured from alloy steel with a Rockwell C32 hardness and 140,000 psi tensile strength, it meets rigorous industrial demands. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, affirming its suitability for global supply chains and environmentally regulated applications.