S-97345A729 3/8"-16 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 environments like chemical processing or marine applications.
- Precise component alignment and rotation enabled by the 1/2" shoulder diameter and 3-1/4" shoulder length, reducing wear and simplifying assembly.
- High mechanical strength and durability with 70,000 psi tensile and 35,000 psi shear strength, ensuring reliable performance under heavy loads.
- Secure, slip-resistant installation thanks to the knurled head and 1/4" hex drive, allowing for high torque application without tool slippage.
- Consistent, reliable threading with Class 3A fit and 3/8"-16 UNC coarse thread, providing excellent engagement and vibration resistance.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring quality and environmental safety for global supply chains.
- Extended service life from Rockwell B79 hardness, maintaining structural integrity in demanding industrial cycles.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery and assembly systems. The 3/8"-16 UNC coarse thread and Class 3A thread fit ensure secure fastening with minimal risk of loosening under vibration, making it ideal for rotating assemblies, pivots, and guides. The knurled head and hex drive facilitate easy installation in tight spaces, while the 1/2" shoulder diameter provides a precise bearing surface that eliminates the need for separate spacers or bushings. Commonly used in industrial automation, conveyor systems, and packaging equipment, this fastener reduces maintenance downtime and enhances operational reliability in corrosive or high-stress environments.
Specification Summary & Compliance
This shoulder screw adheres to Class 3A thread fit and UNC coarse thread standards, with a shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005" for precise dimensional control. It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and consistency for industrial applications.
