S-90311A183 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 ensures secure fastening in high-stress environments, maintaining integrity from -50° to 250°F.
- Superior corrosion resistance from 316 stainless steel construction, ideal for harsh industrial or marine applications.
- High tensile strength of 70,000 psi and minimum shear strength of 35,000 psi for reliable performance under heavy loads.
- Precision Class 3A thread fit with 3/8"-16 UNC coarse threads ensures accurate, easy assembly and reduced risk of cross-threading.
- Knurled socket head with 1/4" hex drive provides enhanced grip and torque application, minimizing tool slippage during installation.
- 1" shoulder length with tight tolerances allows precise alignment and spacing in assemblies, reducing component wear.
- Compliance with ASME B18.3, RoHS 3, and REACH guarantees quality, safety, and environmental standards for global industrial use.
Professional Applications & Engineering Value
This 3/8"-16 UNC shoulder screw is engineered to address common industrial challenges like misalignment, vibration loosening, and corrosion. The 316 stainless steel material offers excellent resistance to chemicals and moisture, making it suitable for precision machinery, automotive assemblies, and marine equipment. The integrated nylon patch thread locker secures fasteners in dynamic applications, preventing unintended disassembly. With a Class 3A thread fit and 1" shoulder length, it ensures accurate positioning in rotating parts or bearings, reducing maintenance needs and enhancing operational lifespan. Ideal for high-strength shoulder bolt requirements, it supports efficient B2B procurement with reliable, standards-compliant performance.
Specification Summary & Compliance
This shoulder screw features a Class 3A thread fit with 3/8"-16 UNC coarse threads, ensuring precise dimensional accuracy per ASME B18.3 standards. The shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005" for consistent fit. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming adherence to environmental and safety guidelines for industrial use.
