S-94035A131 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel and passivated finish for long-lasting performance in harsh environments.
• Precise alignment and spacing ensured by the smooth, 1/8" diameter shoulder with tight tolerances (±0.001") for reliable assembly.
• High-strength construction offering 70,000 psi tensile strength and Rockwell B55 hardness to withstand heavy loads and vibration.
• Easy installation and removal with a hex socket head (5/64" drive) for secure torque application in confined spaces.
• Reliable thread engagement through UNC coarse threads with Class 2A fit, promoting quick assembly and reduced cross-threading risk.
• Durable industrial compliance meeting RoHS 3 and REACH standards for safe, environmentally conscious use.
• Optimized design with a 9/32" shoulder length providing stable bearing surfaces for rotating components.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address critical alignment and durability challenges in precision machinery. The 18-8 Stainless Steel material, combined with a passivated finish, resists corrosion and wear, making it ideal for applications in automotive, aerospace, and electronics where exposure to moisture or chemicals is common. The 1/8" shoulder diameter with minimal tolerance ensures exact positioning of parts like gears and pulleys, reducing misalignment and extending equipment life. Its hex socket head allows for efficient tightening in tight spaces, while the coarse UNC threads facilitate rapid assembly without sacrificing strength. By integrating high tensile strength and compliance with industrial regulations, this shoulder screw delivers reliable performance in demanding environments, minimizing downtime and maintenance costs.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent precision. Dimensions include a shoulder diameter of 1/8" (tolerance: -0.001" to 0") and shoulder length of 9/32" (tolerance: 0" to 0.002"), ensuring exacting alignment. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for industrial and international applications without hazardous substances.