S-97768A387 5/16"-18 ASME B18.3 Shoulder Screws
Shoulder Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
- Superior wear protection from the black oxide finish, reducing friction and extending service life
- High-strength performance delivering 70,000 psi tensile and 35,000 psi shear strength for demanding applications
- Precision alignment and pivot control with the 2-1/2" shoulder and tight diameter tolerance (-0.004" to -0.002")
- Secure, non-slip installation enabled by the knurled head and hex socket drive for reliable torque transfer
- Consistent thread engagement with Class 3A fit and UNC coarse thread for vibration resistance
- Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global supply chain compatibility
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical alignment and durability challenges in industrial machinery, automated systems, and precision equipment. The 18-8 stainless steel core provides excellent resistance to corrosion and oxidation, while the black oxide finish enhances surface durability and reduces galling during assembly. The 2-1/2" shoulder length with minimal tolerance variation ensures precise component spacing and rotational stability, eliminating misalignment in pivoting mechanisms or bearing mounts. Combined with the UNC coarse thread and Class 3A fit, it maintains secure fastening under dynamic loads and vibrations, making it ideal for high-stress applications where reliability is non-negotiable.
Specification Summary & Compliance
This shoulder screw features a 5/16"-18 UNC thread with Class 3A fit for precise thread engagement, and a shoulder diameter tolerance of -0.004" to -0.002" for accurate alignment. Manufactured in compliance with ASME B18.3 specifications, it also meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safety and regulatory adherence for industrial and export use.
