S-97832A128 3/8"-24 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, ideal for harsh industrial environments.
- Precise component alignment ensured by the 1/2" shoulder diameter with tight tolerances for reliable assembly.
- High-strength performance delivering 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding applications.
- Secure, non-slip fastening provided by the knurled socket head, enhancing grip during installation and removal.
- Exceptional thread reliability with Class 3A fit and 3/8"-24 UNF fine thread for vibration resistance and precise engagement.
- Broad industry compliance meeting ASME B18.3 standards, RoHS 3, and REACH for global regulatory acceptance.
- Optimized durability featuring Rockwell B55 hardness for long-term wear resistance in mechanical assemblies.
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical alignment and load-bearing challenges in precision machinery, automation systems, and heavy-duty equipment. The 18-8 stainless steel material provides excellent corrosion resistance, reducing maintenance in humid or chemically aggressive settings. Its 1/2" shoulder diameter with controlled tolerances ensures accurate positioning of moving parts like gears and pulleys, minimizing misalignment and wear. The Class 3A thread fit and UNF fine thread design enhance vibration resistance, crucial for dynamic applications where loosening can lead to failure. Combined with a knurled socket head for secure tool engagement, this screw delivers reliable performance in assembly jigs, rotating shafts, and other high-stress industrial components.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for precise UNF threading. The shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005", ensuring dimensional accuracy. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible manufacturing and use in global markets.
