S-97768A445 5/16"-18 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, ideal for harsh industrial environments
- Enhanced durability and wear resistance from the black oxide finish, reducing maintenance needs
- High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
- Precise alignment and reduced wear thanks to the 2 1/2" shoulder length with tight tolerances
- Secure installation and removal using the 1/4" hex drive and knurled head for improved grip
- Reliable thread engagement with Class 3A fit and coarse UNC threading for vibration resistance
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH for quality assurance
Professional Applications & Engineering Value
This 5/16"-18 UNC shoulder screw is engineered to address critical alignment and strength requirements in precision machinery, automation systems, and heavy-duty assemblies. The 18-8 stainless steel material provides excellent corrosion resistance, while the black oxide finish enhances surface durability and reduces galling. The 2 1/2" shoulder length with minimal tolerances ensures precise component positioning, minimizing misalignment and wear in rotating parts or pivot points. Combined with a Class 3A thread fit and coarse UNC threading, it offers reliable fastening under dynamic loads and vibrations, making it ideal for applications in robotics, conveyor systems, and industrial equipment where socket head accessibility and knurled head grip are essential for maintenance efficiency.
Specification Summary & Compliance
This shoulder screw features a Class 3A thread fit with UNC coarse threading (5/16"-18) and a shoulder diameter tolerance of -0.004" to -0.002" for high precision. It adheres to ASME B18.3 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safety and regulatory conformity in global industrial markets.
