S-91259A123 5/8"-11 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
- Exceptional tensile strength of 140,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance with black oxide finish prolongs service life in harsh industrial environments, minimizing maintenance needs.
- Precision Class 3A thread fit provides tight, secure connections with minimal backlash, enhancing assembly accuracy and stability.
- Knurled socket head design offers improved grip during installation, allowing for easier torque application and reducing slippage.
- High shear strength of 84,000 psi withstands lateral forces, making it ideal for pivoting or rotating mechanisms.
- Compliance with ASME B18.3, RoHS 3, and REACH standards ensures product reliability and environmental safety for global industrial use.
- Coarse UNC threads enable quick assembly and disassembly, saving time in maintenance and production cycles.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical challenges in heavy-duty machinery, automation systems, and precision equipment. The 3/4" shoulder diameter with tight tolerances provides a stable bearing surface, reducing wear in rotating assemblies and ensuring accurate alignment. The black oxide finish enhances durability by resisting rust and corrosion in humid or abrasive conditions, while the 5/8"-11 UNC coarse threads with Class 3A fit deliver secure fastening without galling. Ideal for use in conveyor systems, robotic arms, and industrial jigs, it minimizes downtime by offering high tensile and shear strength, supporting consistent performance in dynamic loads and repetitive motions.
Specification Summary & Compliance
The screw features a Class 3A thread fit per UNC standards, ensuring precise engagement, with a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005" for consistent fit. Manufactured in compliance with ASME B18.3 specifications and ASTM A574 material standards, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) requirements for environmental safety and industrial reliability.
