S-97832A274 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.
- Exceptional mechanical strength with 70,000 psi tensile strength and 35,000 psi minimum shear strength for reliable, heavy-duty applications.
- Precise assembly alignment thanks to the 3/8" shoulder diameter with tight tolerances, ensuring stable component positioning.
- Enhanced grip and reduced slippage from the knurled socket head, allowing for secure tool engagement during installation.
- High thread reliability with Class 3A thread fit and UNC coarse threads, providing consistent fastening performance.
- Broad compliance with ASME B18.3 standards, RoHS 3, and REACH, ensuring safety and regulatory adherence.
- Durable performance backed by Rockwell B55 hardness, offering long-lasting wear resistance.
Professional Applications & Engineering Value
This 1/4-20 UNC shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. Its 18-8 stainless steel material provides excellent corrosion resistance, making it suitable for machinery, automotive, and electronics where environmental factors are a concern. The 3/8" shoulder diameter with controlled tolerances ensures accurate part location, reducing misalignment and vibration issues. Combined with a socket head and knurled texture, it facilitates easy installation in confined spaces while minimizing tool slip. Ideal for industrial applications requiring high strength and repeatability, this screw supports robust performance in demanding conditions, from manufacturing equipment to precision instruments.
Specification Summary & Compliance
The screw features a 1/4"-20 UNC thread with Class 3A thread fit for precise engagement, and a shoulder diameter tolerance of -0.004" to -0.002" for accurate fits. It conforms to ASME B18.3 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring environmental safety and industry-standard reliability.
