S-94035A221 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Corrosion Resistance: Crafted from 18-8 Stainless Steel with a passivated finish for long-lasting performance in harsh industrial environments.
• High-Strength & Durability: With a 70,000 psi tensile strength and Rockwell B55 hardness, this screw withstands significant loads and resists wear.
• Precise Alignment & Smooth Rotation: The precise shoulder fit with minimal diameter tolerance ensures accurate component location and acts as a reliable pivot or axle.
• Secure & Flush Installation: The internal hex socket drive allows for high-torque tightening and provides a clean, unobstructed surface on the head.
• Reliable & Standardized Threading: Features a 1/4-20 UNC coarse thread with a Class 2A fit for easy assembly and dependable fastening in a wide range of materials.
• Extended Bearing Surface: The generous 1-1/4" shoulder length provides a substantial unthreaded section to support moving parts like gears, pulleys, and linkages.
• Compliant for Global Use: Manufactured to be fully RoHS 3 and REACH compliant, meeting stringent international environmental and safety regulations.

Professional Applications & Engineering Value

This stainless steel shoulder screw is engineered to solve critical alignment and pivot-point challenges in mechanical assemblies. The precision shoulder, with its tight diameter tolerance, acts as a built-in dowel, eliminating the need for additional locating pins and ensuring perfect alignment of components like bearings, levers, and cam followers. The 1/4-20 UNC coarse thread and Class 2A fit provide rapid, secure fastening into a tapped hole, while the long, smooth 1-1/4" shoulder length serves as a durable axle or shaft for rotating parts. Made from corrosion-resistant 18-8 Stainless Steel with a passivated finish, it delivers superior performance in demanding applications across automation, machinery, and outdoor equipment, preventing seizing and failure.

Specification Summary & Compliance

This shoulder screw adheres to standard inch system measurements. The thread is a 1/4"-20 UNC with a Class 2A fit for consistent assembly. The unthreaded shoulder features a precise diameter of 5/16" with a tight tolerance and a length of 1-1/4". The drive system is a standard hex socket (5/32"). This component is manufactured to be fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations.