S-97345A221 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 chemical and marine environments.
- Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for high-stress applications.
- Precise assembly and alignment ensured by the Class 3A thread fit and standard shoulder for reduced part movement.
- Easy installation and removal with a 3/16" hex drive and knurled head for improved grip and torque application.
- Reliable performance in coarse threading using 5/16"-18 UNC threads, suitable for rapid assembly and vibration resistance.
- Broad regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for safe, global industrial use.
- Durable, long-lasting design with a Rockwell B79 hardness for wear resistance in repetitive operations.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery and industrial equipment. Its Class 3A thread fit and coarse UNC thread provide secure fastening with minimal risk of loosening under vibration, making it ideal for assembly lines, automotive components, and conveyor systems. The knurled socket head enhances tool engagement, reducing slippage during high-torque installations. With excellent corrosion resistance, it performs reliably in chemical processing, marine, and food-grade applications, while the standard shoulder ensures accurate part positioning and alignment, reducing wear and maintenance costs in high-cyclic environments.
Specification Summary & Compliance
This shoulder screw adheres to Class 3A thread fit tolerances for precise engagement, with a 5/16"-18 UNC coarse thread and right-hand direction. Manufacturing conforms to ASME B18.3 specifications, ensuring dimensional accuracy for the shoulder diameter (3/8" with -0.004" to -0.002" tolerance) and length (3/16" with -0.005" to 0.005" tolerance). The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing safety and environmental standards for industrial procurement.
