S-97768A355 1/4"-20 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.
- High mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance in demanding applications.
- Precise Class 3A thread fit ensures secure fastening and vibration resistance with 1/4"-20 UNC coarse threads.
- Enhanced grip and torque application from the knurled socket head with hex drive, preventing slippage during installation.
- Accurate shoulder dimensions with tight tolerances for consistent alignment and bearing surfaces in assemblies.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH for quality assurance and environmental safety.
- Durable Rockwell B55 hardness provides excellent wear resistance and long-term reliability.
Professional Applications & Engineering Value
This 18-8 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and heavy-duty equipment. The black oxide finish enhances corrosion resistance, reducing maintenance in humid or chemically exposed settings. Its 1/4"-20 UNC coarse thread and Class 3A fit deliver superior holding power, minimizing loosening under vibration—common in motors, conveyors, and pivoting mechanisms. The knurled socket head allows for high-torque installation with standard hex tools, ensuring efficient assembly. With a robust shoulder diameter of 3/8" and precise length tolerances, it provides reliable alignment for gears, pulleys, and linkages, enhancing overall system durability and reducing downtime in industrial applications.
Specification Summary & Compliance
This shoulder screw features a 1/4"-20 UNC thread with Class 3A fit and coarse spacing for secure fastening. Dimensions include a shoulder diameter of 3/8" (tolerance: -0.004" to -0.002") and shoulder length of 1/2" (tolerance: -0.005" to 0.005"), ensuring precision in assembly. Manufactured to meet ASME B18.3 specifications, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing safety and environmental standards.
