S-97345A203 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 or chemical-exposed environments.
- High tensile strength of 70,000 psi ensures reliable performance under heavy loads and mechanical stress.
- Precise Class 3A thread fit guarantees secure, vibration-resistant fastening in critical assemblies.
- Knurled socket head design provides enhanced grip for easier installation and removal with standard hex tools.
- Rockwell B79 hardness offers excellent wear resistance and long-term durability.
- Consistent shoulder diameter and length with tight tolerances for accurate alignment and positioning in machinery.
- Compliance with ASME B18.3 and environmental standards ensures quality, safety, and regulatory adherence.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address common industrial challenges such as misalignment, corrosion, and mechanical failure. The 1/4"-20 UNC coarse thread with Class 3A fit provides a secure, tight connection that resists loosening under vibration, making it ideal for precision machinery, automotive assemblies, and conveyor systems. The knurled socket head enhances tool engagement, reducing slippage during installation. With a 5/16" shoulder diameter and controlled tolerances, it ensures exact component positioning, while the high tensile and shear strength supports demanding applications where reliability is critical. Its corrosion-resistant properties extend service life in humid or chemical environments, reducing maintenance needs and downtime.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for precise engagement and UNC coarse threading for efficient assembly. Dimensions include a thread size of 1/4"-20, shoulder diameter of 5/16" (tolerance: -0.004" to -0.002"), and shoulder length of 5/16" (tolerance: -0.005" to 0.005"). It is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting environmental and safety standards for industrial use.
