S-97345A229 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 in harsh environments due to 316 stainless steel construction, ideal for chemical, marine, and outdoor applications.
- Exceptional mechanical strength with 70,000 psi tensile and 35,000 psi shear strength, ensuring reliable performance under high-stress loads.
- Precise Class 3A thread fit for secure, vibration-resistant assemblies and reduced risk of loosening in dynamic applications.
- Knurled socket head with hex drive provides enhanced grip and easy installation, minimizing tool slippage and damage during tightening.
- Long 2-1/4" precision shoulder offers stable alignment for rotating components like gears and pulleys, reducing wear and misalignment.
- Compliance with ASME B18.3, RoHS 3, and REACH ensures consistent quality, safety, and environmental standards for global industrial use.
- Coarse UNC thread design enables quick assembly and disassembly, improving maintenance efficiency in production lines.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical challenges in industrial fastening, where corrosion, high loads, and precision alignment are paramount. The 5/16"-18 UNC coarse thread with Class 3A fit ensures tight tolerances and resistance to vibration, making it ideal for machinery, automotive, and aerospace assemblies. The knurled socket head and hex drive facilitate secure tool engagement, reducing installation errors. With a 2-1/4" shoulder length and controlled diameter tolerances, it provides reliable support for rotating parts, minimizing friction and extending equipment life in demanding environments like chemical processing or marine systems.
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 (5/16"-18). Dimensions include a shoulder diameter of 3/8" (tolerance: -0.004" to -0.002") and shoulder length of 2-1/4" (tolerance: -0.005" to 0.005"). It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring it meets strict environmental and safety regulations for industrial use.
