S-91259A623 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 strength and durability with 140,000 psi tensile and 84,000 psi shear strength, ideal for high-stress industrial applications.
- Precision-engineered shoulder with tight diameter and length tolerances ensures accurate alignment and smooth rotational movement in assemblies.
- Corrosion-resistant black oxide finish provides enhanced protection against rust and wear in demanding environments.
- Reliable coarse UNC threading (Class 3A fit) offers quick assembly and secure fastening with reduced cross-threading risk.
- Knurled socket head with hex drive allows for easy installation and removal, even in confined spaces.
- Hardened alloy steel construction (Rockwell C32) ensures long-term performance under heavy loads and repeated use.
- Compliance with major standards including ASME B18.3, RoHS 3, and REACH, guaranteeing quality and environmental safety.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical alignment and load-bearing challenges in machinery, automation, and precision equipment. The black oxide finish not only resists corrosion but also reduces friction, making it suitable for rotating parts and pivoting mechanisms. With a 7/8" shoulder length and precise tolerances, it acts as a reliable spacer or axle, maintaining component positioning without additional bushings. The 5/16"-18 UNC coarse thread and Class 3A fit ensure quick, secure fastening in high-vibration settings, while the knurled socket head provides a non-slip grip for efficient maintenance. Ideal for use in industrial assemblies, this screw minimizes wear and extends service life in demanding applications.
Specification Summary & Compliance
This shoulder screw features a 5/16"-18 UNC coarse thread with Class 3A fit for precise engagement, and a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005" to ensure consistent performance. Manufactured in compliance with ASME B18.3 specifications using ASTM A574 alloy steel, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards for environmental safety and material restrictions.
