S-90298A753 3/8"-16 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel and passivated finish, ideal for harsh industrial environments.
• Exceptional dimensional stability with a shoulder diameter tolerance of ±0.001" and length tolerance of ±0.005", ensuring precise alignment in assemblies.
• High-strength, wear-resistant threads with Class 3A fit and coarse UNC thread for reliable, vibration-resistant fastening.
• Secure and efficient installation via the knurled hex socket head, preventing tool slippage under high torque.
• Robust mechanical performance with Rockwell B55 hardness, offering durability for heavy-duty applications.
• Guaranteed compliance and reliability meeting ASME B18.3 standards, RoHS, and REACH for safe, industry-approved use.
• Versatile right-hand coarse thread design for quick assembly and disassembly in various mechanical setups.

Professional Applications & Engineering Value

This precision shoulder screw is engineered to address critical alignment and load-bearing challenges in industrial machinery, automation systems, and precision instruments. The 18-8 stainless steel construction, combined with a passivated finish, ensures long-term resistance to corrosion and chemical exposure, reducing maintenance costs. The exact 1/2" shoulder diameter with tight tolerances provides a stable pivot or bearing surface, minimizing play in rotating assemblies. Featuring a hex socket head with knurling, it allows for secure fastening in confined spaces, while the Class 3A UNC thread delivers high strength for dynamic loads. Ideal for use in conveyor systems, robotic arms, and medical devices, this screw enhances operational reliability and extends equipment lifespan.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, with precise thread dimensions including a 3/8"-16 UNC coarse thread and Class 3A fit for superior engagement. The shoulder features a diameter of 1/2" with a tolerance of -0.001" to 0.001" and a length of 4 3/4" with -0.005" to 0.005" tolerance, ensuring consistent performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and suitability for global industrial applications.