S-91259A456 2-56 ASTM A108 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 under high-stress industrial conditions, reducing the risk of fastener failure.
- Precision Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in dynamic applications.
- Black oxide finish offers enhanced corrosion resistance and a durable, low-glare surface suitable for various environments.
- Knurled head design improves grip during manual installation and removal, increasing assembly efficiency and reducing tool slippage.
- Alloy steel construction with Rockwell C32 hardness delivers excellent wear resistance and long-term durability in demanding applications.
- 5/64" hex drive compatibility allows for secure tool engagement and consistent torque application during installation.
- Compliance with ASTM A108, RoHS 3, and REACH ensures material quality and environmental safety for global industrial use.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical fastening challenges in precision assemblies, such as machinery, automotive components, and electronic enclosures. The 2-56 UNC coarse thread with Class 3A fit ensures tight tolerances and reliable thread engagement, reducing the risk of cross-threading and assembly errors. The black oxide finish not only provides corrosion resistance but also minimizes friction during installation. Combined with a knurled head for enhanced manual handling, this screw offers a robust solution for applications requiring high tensile strength and vibration resistance, such as pivot points and rotating mechanisms, where consistent performance is essential.
Specification Summary & Compliance
This shoulder screw adheres to precise dimensional standards, including a Class 3A thread fit for accurate engagement and a shoulder diameter tolerance of -0.004" to -0.002". It meets ASTM A108 specifications for material quality, and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for international industrial use.
