S-94361A396 5/8"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity: With a tensile strength of 140,000 psi and Rockwell C32 hardness, this shoulder screw reliably handles high-stress applications without deformation or failure.
• Superior Corrosion Resistance: The black oxide finish provides a durable protective layer, extending service life in demanding industrial environments and reducing maintenance needs.
• Precision Thread Fit for Secure Fastening: Class 3A thread fit ensures tight, reliable engagement with minimal backlash, ideal for applications requiring vibration resistance and repeatable assembly.
• Enhanced Grip and Easy Installation: The knurled socket head with 3/8" hex drive offers improved tool grip and torque transmission, speeding up assembly while reducing slippage risks.
• Accurate Shoulder Alignment: Tight shoulder diameter and length tolerances (-0.004" to -0.002" and -0.005" to 0.005" respectively) ensure precise component positioning and smooth rotational movement.
• Compliance with Global Standards: Meets RoHS 3 and REACH regulations, ensuring safe use in regulated industries and simplifying international procurement.
• Optimized for Fine Thread Applications: The 5/8"-18 UNF fine thread design provides increased thread engagement and better clamping force distribution in thin materials or high-vibration settings.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical alignment and durability challenges in industrial machinery. The black oxide finish combats corrosion in humid or chemically exposed environments, while the Class 3A thread fit and UNF fine thread configuration ensure vibration-resistant connections in precision equipment like rotating shafts, bearing mounts, and linkage assemblies. The knurled socket head enhances torque application during installation, reducing assembly time and improving worker safety. With a 1 7/8" shoulder length and controlled tolerances, it provides reliable spacing and rotational support in automation systems, packaging machinery, and heavy-duty automotive components, minimizing wear and maintenance downtime.

Specification Summary & Compliance

This shoulder screw adheres to inch system measurements with a Class 3A thread fit per UNF standards, ensuring precise thread engagement. Shoulder diameter tolerance is maintained at -0.004" to -0.002", and shoulder length tolerance at -0.005" to 0.005" for consistent performance. The product is fully RoHS 3 (2015/863/EU) compliant under exemption 6(a) and REACH (EC 1907/2006) compliant, meeting current environmental and safety regulations for industrial components.