S-91273A228 3/8"-24 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments and extended service life.
• Precise component alignment and smooth rotation ensured by the 2" long, finely toleranced shoulder with a standard fit.
• High mechanical strength and reliability for demanding applications, backed by a 70,000 psi tensile strength and 35,000 psi shear strength.
• Secure, non-slip fastening and adjustment facilitated by the knurled head and 3/16" hex socket drive, allowing for high torque application.
• Accurate and consistent threading with a 3/8"-24 UNF fine thread and Class 2A fit, providing excellent engagement and vibration resistance.
• Compliance with major environmental regulations, being RoHS 3 and REACH compliant, ensuring suitability for global markets and sensitive applications.
• Optimized durability from a Rockwell B55 hardness, offering excellent wear resistance and deformation prevention under load.

Professional Applications & Engineering Value

This stainless steel shoulder screw is engineered to address critical alignment and pivot point requirements in precision assemblies. The 2" shoulder length provides a stable, precisely machined bearing surface, eliminating the need for separate spacers or bushings and reducing assembly complexity in machinery, automotive, and aerospace applications. The 18-8 Stainless Steel material ensures long-term corrosion resistance, while the fine UNF thread and Class 2A fit guarantee secure fastening in high-vibration environments. The combination of a knurled head and hex socket drive allows for reliable manual or tooled installation, making it an indispensable component for designers seeking robust and maintenance-free rotational or linear motion solutions.

Specification Summary & Compliance

This shoulder screw features a 3/8"-24 UNF fine thread with a Class 2A thread fit for standard clearance and reliable engagement. The shoulder diameter is held to a tight tolerance of -0.004" to -0.002", and the shoulder length tolerance is -0.005" to 0.005", ensuring high dimensional accuracy. Manufactured from 18-8 Stainless Steel, it meets a tensile strength of 70,000 psi and a Rockwell B55 hardness. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, affirming its adherence to strict environmental and safety standards for industrial use.