S-97832A270 1/4"-20 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 and extended service life.
- High mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance in demanding applications.
- Precise thread engagement with Class 3A fit and UNC coarse thread, ensuring secure fastening and vibration resistance.
- Easy installation and removal via the 3/16" hex socket drive and knurled head, providing superior grip and torque application.
- Accurate component alignment with a 3/8" shoulder diameter and tight tolerances, minimizing assembly play and wear.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing quality and environmental safety.
- Durable Rockwell B55 hardness for excellent wear resistance and reduced risk of stripping or deformation during use.
Professional Applications & Engineering Value
This 18-8 stainless steel shoulder screw is engineered to address critical alignment and load-bearing challenges in precision assemblies. The 1/4"-20 UNC coarse thread and Class 3A thread fit provide robust, vibration-resistant fastening, essential for machinery, automotive, and aerospace components. The 3/8" shoulder diameter with tight tolerances ensures exact positioning of parts like gears, pulleys, and linkages, reducing misalignment and premature wear. With a socket head and knurled texture, it allows for efficient installation in confined spaces, while the high tensile and shear strength support heavy-duty operational stresses. Ideal for industrial shoulder screw applications requiring durability, precision, and regulatory compliance.
Specification Summary & Compliance
This shoulder screw features a 1/4"-20 UNC thread with Class 3A fit and coarse spacing, ensuring precise thread engagement. Dimensions include a 3/4" thread length, 3/8" shoulder diameter with tolerance of -0.004" to -0.002", and 1/8" shoulder length with tolerance of -0.005" to 0.005". It meets ASME B18.3 specifications for dimensional accuracy and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) for environmental safety.
