S-90298A705 3/8"-16 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 Stainless Steel construction and passivated finish, ideal for harsh industrial environments.
• Exceptional mechanical strength with a 70,000 psi tensile strength and Rockwell B55 hardness for reliable, high-stress applications.
• Precision alignment and location ensured by the 1/2" shoulder diameter with a tight ±0.001" tolerance for accurate component positioning.
• High-reliability threading with Class 3A fit and 3/8"-16 UNC coarse threads for robust, vibration-resistant assemblies.
• Secure and easy installation provided by the hex socket drive and knurled head, allowing for high torque application and improved grip.
• Broad industry compliance meeting ASME B18.3 specifications and being RoHS 3 & REACH compliant for global supply chain integration.
• Durable, long-lasting performance from the right-hand thread and standard shoulder fit, designed for repeated use in demanding mechanical systems.

Professional Applications & Engineering Value

This 18-8 Stainless Steel shoulder screw is engineered to solve critical alignment and wear issues in precision assemblies. Its 1/2" diameter shoulder with minimal tolerance acts as a precise pivot or axle, eliminating the need for additional bushings and reducing assembly complexity in machinery, automation systems, and rotating assemblies. The Class 3A thread fit and coarse UNC threads ensure a secure, vibration-resistant fastening in high-load scenarios, while the passivated finish significantly enhances corrosion resistance, making it suitable for use in environments exposed to moisture or chemicals. The combination of a 70,000 psi tensile strength and hex socket drive allows for high clamping force and easy installation in confined spaces, providing exceptional value in applications from conveyor systems to precision instruments.

Specification Summary & Compliance

This shoulder screw features a 3/8"-16 UNC thread with a Class 3A fit for high precision. The shoulder diameter is 1/2" with a tolerance of -0.001" to 0.001", and the shoulder length is 3/8" with a tolerance of -0.005" to 0.005". It is manufactured in compliance with ASME B18.3 standards and is confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant.