S-97345A627 5/16"-18 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 industrial environments and extended service life
- High-strength performance with 70,000 psi tensile and 35,000 psi shear strength, ensuring reliable load-bearing in demanding applications
- Precise Class 3A thread fit for secure, vibration-resistant assemblies and reduced risk of loosening under stress
- Knurled hex socket head provides enhanced grip for easy installation and removal, even in tight spaces
- Accurate shoulder diameter and length with tight tolerances, enabling precise alignment and smooth rotational movement
- Compliance with ASME B18.3 and environmental standards (RoHS 3, REACH) ensures quality, safety, and regulatory acceptance
- Coarse UNC thread design allows for quick assembly and disassembly, improving maintenance efficiency
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and rotating assemblies. The knurled hex socket head and 1/4" drive facilitate secure tool engagement, minimizing slippage during torque application. With a 5/16"-18 UNC coarse thread and Class 3A fit, it delivers consistent clamping force and resists vibrational loosening in high-cycle operations. The 1/2" shoulder diameter and controlled length tolerances provide exact positioning for bearings, pulleys, or linkages, reducing wear and misalignment. Ideal for industrial fasteners in corrosive or high-stress environments, its Rockwell B79 hardness and 70,000 psi tensile strength ensure durability without compromising corrosion resistance, making it a reliable choice for OEM and MRO applications.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for precision and a coarse UNC thread (5/16"-18). Dimensions include a shoulder diameter of 1/2" (tolerance: -0.004" to -0.002") and shoulder length of 1/4" (tolerance: -0.005" to 0.005"). It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.
