S-91054A465 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 construction, ideal for harsh industrial environments.
- Enhanced wear and galling resistance from the TiCN coating, extending service life in high-friction applications.
- Precise alignment and pivot points ensured by the controlled shoulder diameter and length with tight tolerances.
- Reliable, high-strength fastening with a tensile strength of 70,000 psi and Rockwell B55 hardness for demanding loads.
- Easy installation and removal using a standard 5/64" hex drive, reducing assembly time and tooling requirements.
- Consistent thread engagement with Class 2A thread fit and coarse UNC threads for quick assembly and vibration resistance.
- Global compliance and safety meeting RoHS 3 and REACH regulations for use in regulated markets.
Professional Applications & Engineering Value
This 4-40 UNC shoulder screw is engineered to solve critical alignment and wear challenges in precision assemblies. The 18-8 stainless steel base material provides excellent resistance to rust and oxidation, while the TiCN coating significantly reduces friction and wear, making it ideal for rotating parts, linkages, and pivoting mechanisms in machinery, automotive, and electronics. The precise shoulder with tight diameter and length tolerances acts as a reliable datum for locating components, eliminating misalignment and reducing stress on threads. This design is particularly valuable in applications requiring repeated disassembly, where the combination of high tensile strength and a coarse thread ensures long-term reliability and ease of maintenance in industrial settings.
Specification Summary & Compliance
This shoulder screw features a Class 2A thread fit for consistent assembly, with UNC coarse threads (4-40 size) and a right-hand thread direction. The shoulder diameter is 1/8" with a tolerance of -0.002" to 0", and the shoulder length is 1/2" with a tolerance of 0" to 0.003" for precise fit. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global industrial applications.
