S-90298A820 1/2"-13 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 and passivated finish, ideal for harsh industrial environments.
- Exceptional alignment and stability provided by the long 2 1/2" shoulder, minimizing component misalignment.
- High-strength, precision threads with Class 3A UNC fit ensure reliable, vibration-resistant fastening in demanding applications.
- Easy installation and high torque capability from the 5/16" hex socket drive and knurled head for improved grip.
- Enhanced durability and wear resistance due to Rockwell B55 hardness, extending service life.
- Guaranteed dimensional accuracy with tight shoulder diameter and length tolerances for consistent performance.
- Compliance with major industry standards including ASME B18.3, RoHS, and REACH for safe, reliable use.
Professional Applications & Engineering Value
This precision shoulder screw is engineered to solve critical alignment and stability challenges in industrial machinery, automation systems, and precision assemblies. The 2 1/2" shoulder length acts as a sturdy shaft or pivot, preventing lateral movement and ensuring accurate component positioning. Made from 18-8 Stainless Steel with a passivated finish, it resists corrosion in humid or chemically aggressive settings, while the Class 3A UNC coarse thread and hex socket head allow for secure, high-torque installation. Its Rockwell B55 hardness provides excellent resistance to deformation, making it a reliable choice for heavy-duty applications where repeatability and long-term performance are paramount.
Specification Summary & Compliance
This shoulder screw features a 1/2"-13 UNC Class 3A thread with precise dimensional tolerances: 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) regulations, ensuring environmental safety and industrial reliability.
