S-97768A307 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 and Black Oxide finish, ideal for harsh industrial environments.
- Precise component alignment thanks to the 5/16" shoulder diameter with tight tolerances, reducing assembly errors.
- High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications.
- Secure and efficient installation using a 5/32" hex drive and knurled head for improved grip and torque control.
- Reliable thread engagement with Class 3A UNC coarse threads, ensuring consistent fastening in high-vibration settings.
- Extended service life due to Rockwell B55 hardness, providing excellent wear resistance and durability.
- Compliance with industry standards including ASME B18.3, RoHS, and REACH, guaranteeing safety and regulatory adherence.
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical challenges in precision assemblies, such as maintaining exact pivot points in machinery or securing rotating components without misalignment. The 18-8 Stainless Steel material, combined with a Black Oxide finish, offers robust protection against corrosion and wear in demanding settings like automotive, aerospace, and industrial equipment. The UNC coarse threads and Class 3A fit ensure quick, reliable fastening even under high stress, while the knurled socket head enhances tool engagement to prevent stripping. Ideal for applications requiring repeatable accuracy, such as jigs, fixtures, and conveyor systems, this screw minimizes downtime and improves operational efficiency.
Specification Summary & Compliance
This shoulder screw features precise dimensions, including a 1/4"-20 UNC thread with Class 3A tolerance for superior fit, a shoulder diameter of 5/16" with tight tolerances (-0.004" to -0.002"), and a shoulder length of 9/16" (±0.005"). Manufactured in accordance with ASME B18.3 specifications, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industry-standard reliability.
