S-90311A186 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
- Vibration-resistant locking with integrated nylon patch that maintains secure fastening from -50° to 250° F, preventing loosening in dynamic applications
- Superior corrosion resistance through 316 Stainless Steel construction, ideal for harsh environments and chemical exposure
- Precision alignment capability with Class 3A thread fit and controlled shoulder diameter tolerances ensuring accurate component positioning
- High mechanical strength delivering 70,000 psi tensile strength and 35,000 psi shear strength for demanding industrial applications
- Easy installation and removal with standard 1/4" hex socket drive and knurled head for improved grip during tool operation
- Extended service life through Rockwell B79 hardness and coarse UNC threads that resist wear and stripping
- Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
This 316 Stainless Steel shoulder screw with nylon patch thread locker addresses critical engineering challenges in machinery assembly and precision equipment. The 1 3/4" shoulder length provides precise bearing surfaces for rotating components, while the Class 3A thread fit ensures consistent engagement in high-vibration environments. The coarse UNC thread design facilitates rapid assembly in production settings, and the corrosion-resistant 316 stainless steel maintains integrity in marine, chemical processing, and outdoor applications. The integrated thread locking feature eliminates the need for separate locking components, reducing assembly time and preventing costly downtime from fastener failure in industrial machinery, automation systems, and transportation equipment.
Specification Summary & Compliance
This shoulder screw features 3/8"-16 UNC coarse threads with Class 3A fit for precision engagement, a 1/2" shoulder diameter with tight tolerance control (-0.004" to -0.002"), and 1 3/4" shoulder length with minimal variation (-0.005" to 0.005"). Manufactured to ASME B18.3 specifications with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial applications requiring stringent quality and safety standards.
