S-97345A228 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
- Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial and marine environments.
- Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable, high-load applications.
- Precise location and pivot function provided by the 1 5/8" shoulder with tight diameter tolerance for accurate component alignment.
- Secure, non-slip fastening enabled by the knurled socket head and hex drive, allowing for high torque application without stripping.
- Guaranteed thread reliability with Class 3A fit and coarse UNC thread, ensuring easy assembly and vibration resistance.
- Compliance with major industry standards including ASME B18.3, ensuring dimensional consistency and interchangeability.
- Safe for regulated industries as it is RoHS 3 and REACH compliant, meeting strict environmental and safety directives.
Professional Applications & Engineering Value
This 316 Stainless Steel Shoulder Screw is engineered to address critical challenges in precision assembly. The unthreaded shoulder acts as a precise pivot, bearing surface, or axle, eliminating the need for separate spacers or bushings and reducing part count in assemblies like linkages, gears, and pulleys. The coarse 5/16"-18 UNC thread and Class 3A fit provide excellent resistance to loosening under vibration, which is crucial in machinery and automation equipment. The knurled socket head ensures a firm grip for high-torque installation, while the material's inherent corrosion resistance makes it suitable for demanding environments, including chemical processing and outdoor applications, thereby enhancing machine longevity and reducing maintenance cycles.
Specification Summary & Compliance
This shoulder screw features a 5/16"-18 UNC thread with a Class 3A fit for precision. The shoulder has a diameter of 3/8" with a tight tolerance of -0.004" to -0.002" and a length of 1 5/8" (±0.005"). It is manufactured in compliance with the ASME B18.3 standard and is certified to be RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant.
