S-90311A182 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 industrial environments and chemical exposure
- Permanent vibration resistance through nylon patch thread locker that maintains integrity from -50° to 250°F without loosening
- Enhanced assembly precision with Class 3A thread fit ensuring consistent, reliable engagement in critical applications
- High strength-to-weight ratio delivering 70,000 psi tensile strength and 35,000 psi shear strength for demanding mechanical loads
- Secure tool engagement with hex socket drive and knurled head providing positive grip during installation and removal
- Accurate component alignment through precision-machined 1/2" shoulder diameter with tight tolerance control
- Regulatory compliance assurance meeting ASME B18.3 specifications and RoHS/REACH environmental standards
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw with nylon patch thread locker addresses critical challenges in precision machinery and industrial equipment. The 3/8"-16 UNC coarse threads with Class 3A fit provide exceptional engagement reliability in high-vibration environments, while the 1/2" shoulder diameter ensures precise component alignment in rotating assemblies and bearing applications. The hex socket head with knurled texture facilitates secure tool engagement in confined spaces, making it ideal for precision manufacturing equipment, automated assembly systems, and motion control devices. The combination of corrosion-resistant 316 stainless steel and permanent locking mechanism delivers long-term reliability in demanding industrial settings where maintenance access is limited.
Specification Summary & Compliance
This shoulder screw features Class 3A thread fit with 3/8"-16 UNC coarse threads and precision shoulder dimensions (1/2" diameter, 3/4" length) manufactured to tight tolerances. The fastener complies with ASME B18.3 specifications for dimensional accuracy and mechanical properties, including Rockwell B79 hardness. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring suitability for regulated industries and international markets.
