S-90298A720 3/8"-16 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction and passivated finish, ensuring long-term reliability in harsh industrial environments
• Precise component alignment thanks to the 1/2" shoulder diameter with tight ±0.001" tolerance, minimizing assembly play and vibration
• Exceptional thread integrity with Class 3A fit and UNC coarse threading, providing secure fastening in high-vibration applications
• High strength-to-weight ratio offering 70,000 psi tensile strength and Rockwell B55 hardness for demanding mechanical applications
• Easy installation and removal with hex socket drive and knurled head texture, allowing for secure tool engagement and manual adjustment
• Reduced maintenance requirements through compliant surface treatments meeting RoHS 3 and REACH environmental regulations
• Extended service life with ASME B18.3 standard compliance, ensuring consistent performance in precision machinery applications

Professional Applications & Engineering Value

This 3/8"-16 UNC shoulder screw delivers critical engineering solutions for precision assembly challenges where component alignment and rotational stability are paramount. The 18-8 Stainless Steel construction with passivated finish provides exceptional corrosion resistance for machinery operating in humid or chemically aggressive environments. The precisely machined 1/2" diameter shoulder with minimal tolerance variation serves as a reliable locating surface for bearings, gears, and other rotating components, eliminating the need for additional alignment fixtures. The Class 3A thread fit ensures secure fastening in high-vibration applications common in industrial automation, packaging equipment, and precision manufacturing systems. The combination of hex socket drive and knurled head facilitates both tool-assisted installation and manual adjustments in confined spaces, making it ideal for maintenance-critical applications where downtime must be minimized.

Specification Summary & Compliance

This precision shoulder screw maintains Class 3A thread fit with UNC coarse threading (3/8"-16) and features a shoulder diameter of 1/2" with tolerance of -0.001" to +0.001" and shoulder length of 2" with tolerance of -0.005" to +0.005". Manufactured in compliance with ASME B18.3 standards and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The mechanical properties include Rockwell B55 hardness and 70,000 psi tensile strength, ensuring reliable performance in demanding industrial applications.