S-90298A636 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 and passivated finish, ideal for harsh industrial environments
- Precise alignment and smooth rotation ensured by the 3/8" diameter shoulder with tight ±0.001" tolerance for reliable mechanical assemblies
- High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Secure fastening and easy installation via Class 3A thread fit and hex socket drive, reducing assembly time and improving torque transfer
- Enhanced grip and handling provided by the knurled head texture, preventing slippage during manual adjustments
- Broad compatibility with UNC coarse threading and right-hand direction, fitting standard industrial components
- Regulatory compliance and safety meeting ASME B18.3, RoHS 3, and REACH standards for quality assurance
Professional Applications & Engineering Value
This 18-8 stainless steel shoulder screw is engineered to address critical alignment and durability challenges in industrial settings. The 3" shoulder length with minimal tolerance ensures stable positioning in machinery, reducing wear and misalignment in rotating assemblies like pivots, gears, and linkages. The passivated finish enhances corrosion resistance, extending service life in moist or chemical-exposed environments. With a hex socket drive and coarse UNC threading, it offers quick installation and high clamp load, making it ideal for precision equipment, automotive systems, and conveyor mechanisms where high tensile strength and repeatable performance are essential.
Specification Summary & Compliance
The screw features a 5/16"-18 UNC thread with Class 3A fit for precise engagement, and shoulder dimensions held to tight tolerances (diameter: -0.001" to 0.001"; length: -0.005" to 0.005"). Manufactured in compliance with ASME B18.3 specifications, it also meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe and reliable use across global industries.
