S-94035A521 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh environments.
• High tensile strength of 70,000 psi ensures reliable performance under heavy loads and vibration.
• Precise shoulder fit with diameter tolerance of -0.001" to 0" for accurate alignment in assemblies.
• Easy installation and removal thanks to the hex socket drive and standard UNC coarse threads.
• Durable and wear-resistant with Rockwell B55 hardness, extending service life in industrial applications.
• Compliant with RoHS 3 and REACH regulations, meeting global environmental and safety standards.
• Versatile right-hand thread design with Class 2A fit for consistent, secure fastening in various machinery.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. The 1/8" shoulder diameter with tight tolerances ensures exact positioning in components like bearings, gears, and pivots, reducing wear and misalignment. Made from 18-8 stainless steel with a passivated finish, it resists corrosion in moist or chemical-exposed settings, while the 70,000 psi tensile strength and coarse UNC threads provide robust fastening for high-stress applications in automation, aerospace, and electronics. Its hex socket drive allows for efficient installation in confined spaces, enhancing productivity and reliability in demanding industrial environments.

Specification Summary & Compliance

This shoulder screw adheres to Class 2A thread fit for consistent engagement, with precise shoulder dimensions (diameter: 1/8", length: 7/16") and tolerances ensuring accurate assembly. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, supporting safe and sustainable manufacturing practices without hazardous substances.