S-97768A380 5/16"-18 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
- Enhanced corrosion resistance with 18-8 stainless steel and black oxide finish for longevity in harsh industrial environments.
- Precise alignment and secure positioning thanks to the 3/8" shoulder diameter with tight tolerances for reduced assembly play.
- High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for demanding mechanical applications.
- Superior thread engagement and reliability through Class 3A thread fit and UNC coarse threading for quick, secure fastening.
- Easy installation and removal with hex socket drive and knurled head for improved grip during tool operation.
- Consistent performance and interchangeability ensured by compliance with ASME B18.3 standards.
- Safe for regulated industries with RoHS 3 and REACH compliance, meeting environmental and safety requirements.
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical alignment and durability challenges in industrial fastening systems. The 18-8 stainless steel construction, combined with a black oxide finish, provides excellent resistance to corrosion and wear, making it ideal for machinery, automotive, and electronics assembly where exposure to moisture or chemicals is common. The UNC coarse thread and Class 3A thread fit ensure rapid installation and high clamping force, reducing the risk of loosening under vibration. With a robust shoulder diameter of 3/8" and precise tolerances, it offers stable pivoting and spacing in rotating parts, bushings, and linkages, minimizing maintenance and enhancing equipment lifespan in high-tensile applications.
Specification Summary & Compliance
This shoulder screw features a 5/16"-18 UNC thread with Class 3A fit for high precision, and dimensional accuracy including shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". It is manufactured in accordance with ASME B18.3 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industry-standard reliability.
