S-91273A221 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 long-term reliability.
• High Tensile and Shear Strength (70,000 psi tensile, 35,000 psi shear) ensures dependable performance under heavy mechanical loads.
• Precision Thread Fit (Class 2A) provides consistent, reliable engagement and reduces the risk of cross-threading during assembly.
• Knurled Socket Head with Hex Drive offers enhanced grip and torque application, minimizing tool slippage and speeding up installation.
• Accurate Shoulder Dimensions (1/2" length, 3/8" diameter) allow for precise alignment and spacing in assemblies, reducing component wear.
• Fine UNF Threading (3/8"-24) delivers superior holding power and vibration resistance in dynamic applications.
• Compliance with RoHS 3 and REACH ensures environmental safety and meets international regulatory standards for industrial use.

Professional Applications & Engineering Value

This stainless steel shoulder screw is engineered to address critical alignment and load-bearing challenges in precision machinery, automation systems, and fixture assemblies. The 18-8 stainless steel material provides excellent corrosion resistance, essential for operations in humid or chemically aggressive settings. Its fine UNF threading (3/8"-24) and Class 2A thread fit ensure tight, secure fastening that withstands vibrations, reducing maintenance needs. The knurled socket head with a 3/16" hex drive facilitates quick, torque-efficient installation, while the precisely machined 1/2" shoulder length acts as a reliable pivot or spacer, enhancing component longevity and operational accuracy in demanding industrial applications.

Specification Summary & Compliance

This shoulder screw features a Class 2A thread fit per UNF standards, ensuring dimensional accuracy and interchangeability. The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 1/2" with a tolerance of -0.005" to 0.005" for precise engineering fits. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety standards for industrial components.