S-97345A668 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 316 Stainless Steel construction, ideal for harsh chemical and marine environments.
- Exceptional mechanical strength providing reliable performance under high stress with 70,000 psi tensile and 35,000 psi shear strength.
- Precise alignment and smooth rotation ensured by the 1 3/8" shoulder length with tight manufacturing tolerances.
- Easy installation and removal using a standard 3/16" hex drive and a knurled head for improved grip.
- Secure and reliable thread engagement with Class 3A fit and coarse 1/4"-20 UNC threads for vibration resistance.
- Broad industrial compliance meeting ASME B18.3 specifications and environmental standards like RoHS 3 and REACH.
- Durable and long-lasting performance backed by a Rockwell B79 hardness rating, reducing wear in dynamic applications.
Professional Applications & Engineering Value
This 316 Stainless Steel shoulder screw is engineered to address critical needs in precision machinery, automation systems, and assembly jigs where alignment and corrosion resistance are paramount. The 1/4"-20 UNC coarse thread and Class 3A thread fit ensure secure fastening in high-vibration environments, while the knurled socket head allows for quick tool engagement and reduced slippage. The extended 1 3/8" shoulder length provides a precise pivot or bearing surface, minimizing misalignment in rotating components. Its high tensile and shear strength makes it suitable for demanding applications in aerospace, medical equipment, and food processing, where RoHS and REACH compliance is essential for safety and regulatory adherence.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 standards, with precise dimensions including a 1/4"-20 UNC thread (Class 3A fit), 3/8" shoulder diameter (tolerance: -0.004" to -0.002"), and 1 3/8" shoulder length (tolerance: -0.005" to 0.005"). It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring it meets stringent environmental and safety regulations for industrial use.
