S-97345A633 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 in harsh environments thanks to 316 Stainless Steel construction, ideal for chemical, marine, and outdoor applications.
- High-strength performance with a 70,000 psi tensile strength and 35,000 psi shear strength for reliable load-bearing in demanding assemblies.
- Precise, secure mating ensured by the Class 3A thread fit and 1/4"-20 UNC coarse thread, providing excellent vibration resistance and easy assembly.
- Enhanced grip and tool engagement from the knurled head and 3/16" hex drive, preventing cam-out and allowing for high-torque installation.
- Durable, long-lasting wear resistance due to a Rockwell B79 hardness, reducing thread deformation and extending service life.
- Guaranteed dimensional accuracy and interchangeability as it is manufactured to meet ASME B18.3 specifications.
- Safe for regulated industries with full compliance to RoHS 3 and REACH environmental standards.
Professional Applications & Engineering Value
This 316 Stainless Steel Shoulder Screw is engineered to solve critical alignment and pivot point challenges in industrial applications. The unthreaded shoulder with a precise diameter of 3/8" acts as a bearing surface or pivot, eliminating the need for separate spacers or bushings and reducing assembly components. The coarse UNC thread and Class 3A fit ensure a tight, secure fastening that resists loosening under vibration, which is common in machinery and automation equipment. The knurled socket head provides a non-slip surface for handling and allows the hex drive to deliver high torque without stripping. Made from corrosion-resistant 316 stainless steel, it performs reliably in demanding environments, from food processing to chemical plants, offering a robust and maintenance-free fastening solution.
Specification Summary & Compliance
This shoulder screw features a 1/4"-20 UNC thread with a Class 3A fit for high precision. The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 13/32" with a tolerance of -0.005" to 0.005". It is manufactured in compliance with the ASME B18.3 standard and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring it meets strict industry and environmental regulations.
