S-90298A721 3/8"-16 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.
- Precise alignment and smooth rotation ensured by the 1/2" shoulder diameter with tight ±0.001" tolerance for reliable assembly.
- High tensile strength of 70,000 psi and Rockwell B55 hardness provide exceptional durability and resistance to wear.
- Secure, non-slip installation facilitated by the knurled head and 1/4" hex socket drive for easy torque application.
- Accurate and reliable thread engagement with Class 3A fit and 3/8"-16 UNC coarse threads for quick assembly.
- Broad compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory adherence.
- Versatile right-hand threading and 2 1/4" shoulder length offer flexibility in various mechanical applications.
Professional Applications & Engineering Value
This 18-8 stainless steel shoulder screw is engineered to address critical needs in precision machinery, automation systems, and heavy-duty equipment. The passivated finish enhances corrosion resistance, extending service life in demanding environments. With a 1/2" shoulder diameter held to a tight tolerance of ±0.001", it ensures exact alignment and reduces wear on moving parts. The Class 3A thread fit and 3/8"-16 UNC coarse threads provide secure fastening and ease of assembly, while the knurled head and hex socket drive allow for efficient installation without slippage. Ideal for use in pivots, axles, and spacers, this screw delivers reliable performance in applications requiring high tensile strength and dimensional stability.
Specification Summary & Compliance
This shoulder screw features a 3/8"-16 UNC thread with Class 3A fit for precise thread engagement. The shoulder diameter tolerance is -0.001" to 0.001", and shoulder length tolerance is -0.005" to 0.005", ensuring high dimensional accuracy. It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards for environmental safety.
