S-90298A143 4-40 ASME B18.3 Shoulder Screws
Shoulder Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments.
- Precise component alignment ensured by the 1/8" shoulder diameter with a tight ±0.001" tolerance for reliable positioning.
- High-strength, reliable fastening from the 4-40 UNC coarse thread with Class 3A fit, providing excellent thread engagement and vibration resistance.
- Easy installation and high torque capability with the internal hex socket (5/64" drive), allowing for secure tightening in confined spaces.
- Extended service life and durability due to the smooth head texture and robust material, reducing wear and maintenance needs.
- Guaranteed dimensional consistency and interchangeability, manufactured in compliance with the ASME B18.3 standard.
- Safe for sensitive applications as it meets RoHS 3 and REACH environmental regulations, ensuring no hazardous substances.
Professional Applications & Engineering Value
This 18-8 stainless steel shoulder screw is engineered to solve critical alignment and durability challenges in precision assemblies. Its 1/8" shoulder diameter with minimal tolerance provides a stable pivot or bearing surface, preventing component misalignment in machinery, automotive, and electronic devices. The 4-40 UNC coarse thread and Class 3A fit ensure quick assembly and high resistance to loosening under vibration, while the passivated finish enhances corrosion resistance in moist or chemical-exposed environments. Coupled with a hex socket drive, it allows for efficient installation in tight spaces, making it ideal for applications requiring reliable shoulder positioning and long-term performance without frequent replacements.
Specification Summary & Compliance
This shoulder screw adheres to Class 3A thread fit for precise thread engagement and features a shoulder diameter tolerance of -0.001" to 0.001" and shoulder length tolerance of -0.005" to 0.005". It conforms to ASME B18.3 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring environmental safety and regulatory adherence.
