S-90298A615 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.
- Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-lasting performance.
- Precise alignment and smooth rotation ensured by the knurled head and standard shoulder fit, reducing assembly time and wear.
- Easy installation and high torque capability with a hex socket drive (3/16") and right-hand UNC coarse threads for quick, secure fastening.
- Accurate and secure thread engagement due to Class 3A thread fit, minimizing the risk of loosening under vibration.
- Broad compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory adherence.
- Versatile application in precision assemblies thanks to tight shoulder diameter and length tolerances for consistent part positioning.
Professional Applications & Engineering Value
This 18-8 stainless steel shoulder screw is engineered to address critical challenges in industrial and mechanical assemblies where precision, durability, and corrosion resistance are paramount. The passivated finish enhances its ability to withstand corrosive environments, while the UNC coarse threads and Class 3A thread fit provide secure, vibration-resistant fastening in machinery, automotive, and electronics applications. The knurled head and hex socket drive allow for easy handling and high-torque installation, reducing assembly errors. With a 70,000 psi tensile strength and precise shoulder dimensions, it ensures reliable performance in pivots, spacers, and rotating components, minimizing maintenance and downtime.
Specification Summary & Compliance
This shoulder screw features a 5/16"-18 UNC thread with Class 3A fit for high precision, and shoulder diameter and length tolerances of -0.001" to 0.001" and -0.005" to 0.005", respectively. It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safety and reliability for industrial use.
