S-94035A129 4-40 Shoulder Screws
Shoulder Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with 18-8 Stainless Steel and passivated finish, ideal for harsh industrial environments
- Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-term performance
- Precise shoulder fit with a 1/8" diameter and tight tolerances (-0.001" to 0") ensuring accurate alignment in assemblies
- Easy installation and removal using a standard 5/64" hex socket drive, reducing assembly time and tool wear
- Consistent thread engagement with Class 2A UNC coarse threads for secure fastening and vibration resistance
- Compliance with environmental standards including RoHS 3 and REACH, ensuring safe use in regulated industries
- Smooth head texture minimizes friction and damage to mating surfaces during tightening
Professional Applications & Engineering Value
This 4-40 UNC shoulder screw is engineered to address critical alignment and durability challenges in precision machinery, such as in robotics, automotive assemblies, and electronic enclosures. The 18-8 Stainless Steel construction, combined with a passivated finish, provides excellent resistance to corrosion and wear, extending service life in demanding conditions. The precisely machined 1/8" shoulder diameter with minimal tolerances ensures exact positioning of components, reducing misalignment and improving overall system accuracy. Its hex socket head allows for efficient torque application in confined spaces, while the Class 2A thread fit and coarse thread spacing enhance grip and vibration resistance, making it a reliable choice for high-stress applications where fastener integrity is paramount.
Specification Summary & Compliance
This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent performance. Dimensions include a shoulder diameter of 1/8" (tolerance: -0.001" to 0") and shoulder length of 7/32" (tolerance: 0" to 0.002"), ensuring precise manufacturing. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for industrial use without hazardous substances.
