S-90298A173 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 thanks to 18-8 stainless steel construction with passivated finish, ideal for harsh environments.
- Precise component alignment ensured by the 1/2" diameter shoulder with tight tolerances for reliable assembly.
- High-strength, secure fastening with Class 3A thread fit and UNC coarse threads for excellent vibration resistance.
- Easy, high-torque installation using the 1/4" hex socket drive, preventing tool slippage.
- Enhanced grip during manual adjustment provided by the knurled head texture.
- Guaranteed dimensional consistency and interchangeability, manufactured to ASME B18.3 standards.
- Safe for regulated industries with full compliance to RoHS 3 and REACH environmental directives.
Professional Applications & Engineering Value
This shoulder screw is engineered to solve critical alignment and pivot point challenges in industrial machinery. The 18-8 stainless steel material and passivated finish provide exceptional resistance to rust and chemical exposure, extending service life in demanding conditions. The precisely machined 1/2" shoulder diameter acts as a reliable locating dowel or bearing surface, preventing lateral movement of assembled components. Combined with the 3/8"-16 UNC coarse thread and Class 3A fit, it ensures a secure, vibration-resistant connection that maintains integrity under dynamic loads. The hex socket head allows for high-torque installation in confined spaces, making it a versatile solution for automation equipment, precision instruments, and heavy-duty assemblies.
Specification Summary & Compliance
This shoulder screw features a Class 3A thread fit for high precision, with a shoulder diameter tolerance of -0.001" to 0.001" and shoulder length tolerance of -0.005" to 0.005". It conforms to the ASME B18.3 standard for dimensional consistency and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances for safe use in various industrial and international markets.
