S-97768A427 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 18-8 stainless steel construction and black oxide finish, ideal for harsh industrial environments
- Precise component alignment ensured by the 1/2" shoulder diameter with tight tolerance control for reduced assembly vibration
- High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for demanding mechanical applications
- Secure installation and removal using the 1/4" hex drive and knurled head for superior grip with standard tools
- Reliable thread engagement with Class 3A UNC coarse threads providing consistent fastening in high-vibration settings
- Extended service life from Rockwell B55 hardness and compliant coatings that resist wear and chemical exposure
- Global regulatory acceptance meeting ASME B18.3, RoHS 3, and REACH standards for international supply chain integration
Professional Applications & Engineering Value
This 3/8"-16 UNC shoulder screw delivers critical performance in precision assemblies where alignment and durability are paramount. The 18-8 stainless steel core, enhanced by a black oxide finish, combats corrosion in manufacturing, automotive, and outdoor equipment. Its 1/2" shoulder diameter acts as a precise pivot or spacer, eliminating bushing needs and reducing part count. The Class 3A thread fit and coarse UNC threads ensure rapid assembly and high resistance to loosening under dynamic loads. With a knurled head and hex drive, installation is secure even in greasy or gloved conditions, making it a top choice for machinery, conveyor systems, and robotic arms requiring repeatable accuracy.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications, this shoulder screw maintains Class 3A thread fit for superior thread engagement. The shoulder diameter tolerance is controlled between -0.004" to -0.002", and shoulder length tolerance from -0.005" to 0.005" to ensure precise fits. It is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and safety standards for industrial components.
