S-97768A361 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and black oxide finish, ideal for harsh industrial environments.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under high stress.
• Precise alignment and spacing ensured by the 3/4" shoulder length with tight tolerances, reducing assembly errors.
• Secure, non-slip fastening provided by the knurled head and hex socket drive, allowing for high-torque installation.
• Broad compatibility with UNC coarse 1/4"-20 threads (Class 3A fit) for easy integration into standard industrial equipment.
• Long-term durability backed by Rockwell B55 hardness, maintaining integrity through repeated use.
• Regulatory peace of mind with compliance to ASME B18.3, RoHS 3, and REACH standards for safe, global use.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical alignment and wear issues in precision assemblies. The 18-8 stainless steel material, combined with a black oxide finish, provides excellent resistance to corrosion and oxidation, making it suitable for applications in machinery, automotive, and electronics where environmental factors are a concern. The 3/4" shoulder length acts as a precise pivot or spacer, minimizing misalignment in rotating parts like gears and pulleys. With a UNC coarse thread and Class 3A fit, it ensures quick, secure fastening without cross-threading, reducing downtime in production lines. The hex socket drive and knurled head design allow for efficient installation in confined spaces, enhancing overall assembly efficiency and reliability in industrial shoulder screw applications.

Specification Summary & Compliance

This shoulder screw features precise dimensions, including a shoulder diameter of 3/8" (tolerance: -0.004" to -0.002") and shoulder length of 3/4" (tolerance: -0.005" to 0.005"), with UNC 1/4"-20 coarse threads and a Class 3A thread fit for high accuracy. It is manufactured in accordance with ASME B18.3 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and performance reliability in various engineering applications.