S-97345A244 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 environments and extended service life.
- Exceptional mechanical strength with 70,000 psi tensile and 35,000 psi shear strength for reliable performance in demanding applications.
- Precise and secure assembly ensured by the Class 3A thread fit, minimizing the risk of loosening under vibration.
- Enhanced grip and easier manual adjustment provided by the knurled socket head, even in confined spaces.
- Accurate component alignment and spacing due to the precisely machined 3/8" diameter shoulder with controlled tolerances.
- Broad compatibility and quick installation with the standard 1/4"-20 UNC coarse thread and 3/16" hex drive.
- Guaranteed quality and material safety through compliance with ASME B18.3, RoHS 3, and REACH standards.
Professional Applications & Engineering Value
This 316 Stainless Steel Shoulder Screw is engineered to solve critical challenges in precision assembly. The Class 3A thread fit and coarse UNC thread provide a secure, vibration-resistant connection that is essential for machinery, automotive components, and conveyor systems. The unthreaded shoulder acts as a precise pivot, bearing surface, or spacer, maintaining exact alignment between parts such as gears, pulleys, and linkages. Manufactured from corrosion-resistant 316 stainless steel, it delivers long-term reliability in humid, chemical, or marine environments, reducing maintenance frequency and downtime. The combination of a knurled socket head and hex drive allows for high-torque installation and easy adjustment, making it a versatile and durable industrial fastener for high-stress applications.
Specification Summary & Compliance
This shoulder screw features a 1/4"-20 UNC coarse thread with a precision Class 3A fit. The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 5/8" with a 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) environmental regulations.
