S-90298A201 4-40 ASME B18.3 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 and passivated finish, ideal for harsh industrial environments.
- High tensile strength of 70,000 psi ensures reliable performance under heavy loads and mechanical stress.
- Precision Class 3A thread fit guarantees tight tolerances and secure fastening in critical assemblies.
- Coarse UNC threads provide quick installation and reduced risk of cross-threading in repetitive applications.
- Hex socket drive (5/64") allows for easy, high-torque installation with standard tools, minimizing slippage.
- Strict dimensional control on shoulder diameter and length (±0.001" and ±0.005" tolerance) ensures consistent alignment and fit.
- Compliance with ASME B18.3, RoHS, and REACH meets industry standards for safety, quality, and environmental regulations.
Professional Applications & Engineering Value
This 18-8 stainless steel shoulder screw is engineered to address precision alignment and durability challenges in demanding mechanical systems. The 4-40 UNC coarse thread with Class 3A fit ensures minimal backlash and reliable fastening in applications like robotics, aerospace components, and automated machinery. The passivated finish enhances corrosion resistance, extending service life in humid or chemically aggressive environments. With a 1/8" shoulder diameter and controlled tolerances, it provides exact positioning for bearings, pulleys, and rotating assemblies, reducing wear and maintenance costs. Ideal for industrial and mechanical uses, this screw offers consistent performance where precision and strength are critical.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with Class 3A thread fit for precise engagement and UNC coarse threads for efficient assembly. Dimensional accuracy includes shoulder diameter tolerance of -0.001" to 0.001" and shoulder length tolerance of -0.005" to 0.005". It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring environmental safety and regulatory adherence in global markets.
