S-91259A712 3/8"-16 ASME B18.3, ASTM A574 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 load-bearing capability with 140,000 psi tensile strength and 84,000 psi shear strength for reliable performance in high-stress applications.
- Precision alignment and smooth rotation ensured by the 1/2" shoulder diameter with tight tolerances, reducing wear on mating components.
- Enhanced corrosion resistance and reduced light reflection from the black oxide finish, extending service life in demanding industrial environments.
- Secure, non-slip installation with a knurled socket head and 1/4" hex drive, allowing for high torque application without tool slippage.
- Consistent, reliable threading with Class 3A UNC coarse threads, providing excellent fit and vibration resistance in assembly operations.
- Broad compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.
- Durable material construction using alloy steel hardened to Rockwell C32, offering long-term durability and resistance to deformation.
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical alignment and load distribution challenges in precision machinery, such as in automated assembly systems, robotic linkages, and rotating shaft applications. The alloy steel construction and black oxide finish provide excellent resistance to wear and environmental factors, while the UNC coarse thread and Class 3A fit ensure quick, secure fastening with minimal risk of loosening under vibration. The precisely machined shoulder acts as a bearing surface or pivot, reducing friction and simplifying assembly in tight-tolerance designs, making it ideal for industries requiring repeatable accuracy and high mechanical strength.
Specification Summary & Compliance
This shoulder screw features a 3/8"-16 UNC coarse thread with Class 3A precision fit, a shoulder diameter of 1/2" (tolerance: -0.004" to -0.002"), and a shoulder length of 1" (tolerance: -0.005" to 0.005"). 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 reliable performance and regulatory adherence for industrial use.
