S-97832A309 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, ensuring long-term reliability in harsh industrial environments.
- Precise alignment and secure fit thanks to Class 3A thread fit and standard shoulder fit, reducing assembly errors and improving component stability.
- Enhanced torque transmission and grip from the knurled socket head with hex drive, preventing tool slippage during installation.
- High mechanical strength with 70,000 psi tensile strength and 35,000 psi minimum shear strength, suitable for heavy-duty applications.
- Consistent dimensional accuracy with tight shoulder diameter and length tolerances, ensuring repeatable performance in precision assemblies.
- Broad compatibility with UNC coarse thread and right-hand threading, facilitating easy integration into standard industrial equipment.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing safety and environmental responsibility.
Professional Applications & Engineering Value
This 18-8 Stainless Steel shoulder screw is engineered to address critical challenges in mechanical assemblies, such as misalignment and component wear. The 1/4"-20 UNC coarse thread and Class 3A thread fit provide secure fastening with minimal play, ideal for pivots, rotating shafts, and spacers in machinery. The knurled socket head enhances torque application, reducing the risk of stripping in high-vibration environments. With a 7/16" shoulder length and precise shoulder diameter, it ensures accurate positioning in automated systems and robotics, while the corrosion-resistant material extends service life in demanding conditions like manufacturing and automotive applications.
Specification Summary & Compliance
This shoulder screw features a Class 3A thread fit for tight tolerances, with shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". It adheres to ASME B18.3 specifications for dimensional consistency and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.
