S-90298A145 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 from 18-8 stainless steel and passivated finish, ideal for harsh environments and long-term reliability
- Precise component alignment ensured by the 1/8" shoulder diameter with tight tolerance, minimizing assembly play and vibration
- High-strength thread engagement with 4-40 UNC Class 3A fit, providing secure fastening and reduced risk of stripping in mechanical assemblies
- Easy installation and removal using standard 5/64" hex drive, compatible with common tools for efficient maintenance
- Durable smooth socket head maintains integrity under torque and resists wear from repeated use
- Compliance with industry standards including ASME B18.3, ensuring consistent quality and interchangeability in professional applications
- Environmental regulation adherence with RoHS 3 and REACH compliance, supporting sustainable and safe manufacturing practices
Professional Applications & Engineering Value
This 18-8 stainless steel shoulder screw is engineered to address critical alignment and durability challenges in precision mechanical systems. The 4-40 UNC coarse thread and Class 3A fit deliver reliable clamping force, reducing loosening in high-vibration environments like robotics, automation equipment, and precision instruments. The 1/8" shoulder diameter with minimal tolerance provides exact positioning for bearings, pulleys, or linkages, eliminating misalignment issues. The passivated finish enhances corrosion resistance, making it suitable for applications exposed to moisture or chemicals. By integrating a socket head with hex drive, it allows for compact installations where space is limited, ensuring efficient assembly and maintenance in industrial settings.
Specification Summary & Compliance
The screw features a 4-40 UNC thread with Class 3A precision and a shoulder diameter of 1/8" (tolerance: -0.001" to 0.001") and length of 3/4" (tolerance: -0.005" to 0.005"). It is manufactured in accordance with ASME B18.3 specifications and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industry-standard reliability.
