S-91259A617 5/16"-18 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 from the black oxide finish extends service life in harsh industrial environments, minimizing maintenance needs.
- Precise Class 3A thread fit provides consistent engagement and vibration resistance, enhancing assembly reliability.
- Knurled head design offers improved grip for manual adjustments, facilitating easier installation and removal without specialized tools.
- High shear strength of 84,000 psi supports heavy loads in dynamic applications, ensuring joint integrity under lateral forces.
- Rockwell C32 hardness maintains dimensional stability under pressure, reducing wear and prolonging fastener lifespan.
- Hex drive compatibility with 3/16" drive size allows for efficient torque application, speeding up assembly processes.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and heavy-duty equipment. The 5/16"-18 UNC coarse thread with Class 3A fit ensures secure fastening in high-vibration environments, preventing loosening in applications like robotic arms and conveyor systems. The black oxide finish provides a durable barrier against moisture and chemicals, ideal for manufacturing plants or outdoor use. With a 3/8" shoulder diameter and precise tolerances, it acts as a reliable pivot or spacer in assemblies, reducing component wear and simplifying maintenance. Its compliance with ASME B18.3 standards guarantees consistency for B2B procurement, while the knurled head enhances usability in tight spaces, streamlining installation for industrial technicians.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for tight tolerances and a shoulder diameter tolerance of -0.004" to -0.002". It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for environmental safety, and is manufactured under ASTM A574 standards to ensure material integrity and performance consistency.
