S-94035A139 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 industrial environments.
• High tensile strength of 70,000 psi ensures reliable load-bearing capacity and durability in demanding applications.
• Precise shoulder fit with tight diameter and length tolerances for accurate alignment and reduced component wear.
• Class 2A thread fit provides smooth assembly and consistent fastening performance with UNC coarse threads.
• Hex socket drive (5/64") allows for secure tool engagement and easy installation in confined spaces.
• Rockwell B55 hardness offers excellent resistance to deformation under stress.
• Compliance with RoHS 3 and REACH ensures environmental safety and regulatory acceptance for global supply chains.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address alignment and spacing challenges in precision assemblies. The 1/8" diameter shoulder with a 7/8" length provides a stable bearing surface, minimizing misalignment and reducing wear on mating parts. Made from 18-8 stainless steel with a passivated finish, it resists corrosion in moist or chemical-exposed settings, extending service life in industries like automation, electronics, and machinery. The coarse UNC threads and Class 2A fit ensure quick, reliable fastening, while the hex socket drive facilitates efficient installation in tight spaces, boosting productivity and reducing maintenance costs.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent performance. Shoulder dimensions include a diameter of 1/8" (tolerance: -0.001" to 0") and length of 7/8" (tolerance: 0" to 0.002"), ensuring precise assembly. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, supporting safe and sustainable industrial use.