S-97768A290 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 alignment and reduced wear thanks to the 5/16" shoulder diameter with tight tolerances, ensuring accurate component positioning.
- High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for demanding mechanical applications.
- Reliable, vibration-resistant fastening from Class 3A thread fit and coarse UNC threads, minimizing loosening under stress.
- Easy installation and removal with a hex socket drive and knurled head for improved grip and torque application.
- Enhanced durability and hardness with Rockwell B55 rating, providing long-term performance in repetitive use scenarios.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory adherence.
Professional Applications & Engineering Value
This shoulder screw is engineered to address common challenges in precision assemblies, such as misalignment and component wear. The 18-8 stainless steel material, combined with a black oxide finish, offers excellent corrosion resistance, making it suitable for applications in machinery, automotive, and electronics where exposure to moisture or chemicals is a concern. The 5/16" shoulder diameter provides a stable bearing surface, allowing for accurate pivoting or spacing in linkages, gears, and rotating parts. With UNC coarse threads and a Class 3A fit, it ensures secure fastening in high-vibration environments, reducing maintenance needs. The hex socket drive and knurled head facilitate easy handling in tight spaces, enhancing efficiency in assembly lines and repair operations.
Specification Summary & Compliance
This shoulder screw features precise dimensions, including a thread size of 1/4"-20 UNC with Class 3A thread fit for tight tolerances, and a shoulder diameter of 5/16" with tolerances from -0.004" to -0.002". It meets ASME B18.3 manufacturing specifications and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industry-standard reliability.
