S-97345A642 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
- Precise component alignment ensured by the 3/8" shoulder diameter with tight tolerances for reduced assembly play
- High-strength performance delivering 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
- Secure, vibration-resistant installation with Class 3A thread fit providing superior holding power
- Easy installation and removal via the knurled socket head with hex drive, preventing tool slippage
- Regulatory compliance assurance meeting ASME B18.3 standards and RoHS/REACH environmental directives
- Durable, long-lasting operation with Rockwell B79 hardness resisting wear in high-cycle applications
Professional Applications & Engineering Value
This 316 Stainless Steel shoulder screw is engineered to solve critical alignment and corrosion challenges in precision assemblies. The 3/8" diameter shoulder with controlled tolerances provides an exact pivot point for rotating components, eliminating bushing wear in machinery, conveyor systems, and robotic arms. The Class 3A UNC coarse thread ensures rapid assembly while maintaining vibration resistance, crucial for production equipment subject to cyclic loading. With 70,000 psi tensile strength and full RoHS/REACH compliance, this fastener delivers reliable performance in food processing, chemical handling, and outdoor applications where material integrity is paramount. The knurled socket head design allows secure tool engagement even in greasy conditions, reducing installation time and improving worker safety.
Specification Summary & Compliance
This shoulder screw maintains Class 3A thread fit per ASME B18.3 specifications, with shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005" for precision alignment. Manufacturing complies with ASME B18.3 standards and environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring suitability for regulated industries and international supply chains.
