S-94128A142 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior Thread Reliability: Class 3A thread fit ensures tighter tolerances and more secure fastening in high-vibration applications.
• Exceptional Strength & Durability: Made from high-strength alloy steel with Rockwell C32 hardness for excellent wear resistance and long service life.
• Precision Shoulder for Accurate Alignment: Precise 1/8" diameter and 1/4" length shoulder provides exact component positioning and reduces assembly errors.
• Space-Saving Headless Design: Headless slotted style allows for flush mounting in confined spaces while maintaining easy installation and removal.
• Wide Compatibility with Coarse Threads: 4-40 UNC coarse thread facilitates quicker assembly and better performance in materials prone to stripping.
• Environmentally Compliant Manufacturing: Meets RoHS 3 and REACH standards, ensuring safety and regulatory compliance for global industrial use.
• Optimized for Right-Hand Drive Systems: Right-hand thread direction integrates seamlessly with standard machinery and automated assembly processes.

Professional Applications & Engineering Value

This precision shoulder screw is engineered to address critical alignment and durability challenges in industrial assemblies. The alloy steel construction and Rockwell C32 hardness provide robust resistance to shear forces and fatigue, making it ideal for high-stress environments like robotics, automotive jigs, and precision machinery. The headless slotted design and precise shoulder dimensions (1/8" diameter, 1/4" length) ensure components are accurately positioned without protruding hardware, reducing clearance issues and maintenance downtime. With its 4-40 UNC coarse thread and Class 3A fit, it offers reliable engagement in softer materials or applications requiring frequent adjustments, enhancing overall assembly efficiency and longevity.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for high precision. Shoulder diameter is 1/8" with a tolerance of -0.001" to 0", and shoulder length is 1/4" with a tolerance of 0" to 0.005", ensuring exact shoulder fit. It is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and suitability for demanding industrial applications.