SK Type QD (Quick Detachable) bushings are precision-engineered components used to mount pulleys, sprockets, or sheaves onto a shaft. They feature a flanged, tapered design with a split through one side, allowing easy installation and removal without shaft damage. The bushing grips the shaft tightly when cap screws are tightened, ensuring a secure, vibration-resistant fit. Available in various bore sizes, SK bushings are typically made of high-quality steel or cast iron, ideal for high-power applications requiring reliable torque transmission.
SK Type QD Bushing Dimensions
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| QD Bushing Type: | SK | |
| Dimensions(in): | A | 9/16 |
| B | 2.812 | |
| D | 3-7/8 | |
| E | 1-3/8 | |
| F | 1-1/4 | |
| G | 3/16 | |
| L | 1-15/16 | |
| Bolt Circle (in): | 3-5/16 | |
| Stock Bore Range(in): | Min. | 1/2 |
| Max. | Standard Keyway 2-1/8 Shallow Keyway 2-1/2 No Keyway 2-5/8 |
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| Cap Screws Included: | No. | 3 |
| Thread | 5/16-18 | |
| Length (in) | 2 | |
| Set Screw Size: | 5/16 | |
| Wrench-Torque (in-Ibs): | 180 | |
| Approx.Weight (Ibs): | 2.0 | |
Key Benefits of SK Type QD Bushings
SK Type Quick Disconnect (QD) bushings offer several key benefits that make them a preferred choice in industrial applications for mounting pulleys, sprockets, and sheaves. Below are the primary advantages:
- Ease of Installation and Removal: SK Type QD bushings feature a split, flanged design that simplifies installation and removal, requiring only basic tools. This reduces downtime during maintenance or component replacement, enhancing operational efficiency in industrial settings where time is critical.
- Strong Clamping Force: The tapered design of SK QD bushings provides a robust clamping force on the shaft, comparable to a shrink fit. This ensures secure mounting, minimizes slippage, and maintains alignment under high torque, which is ideal for demanding power transmission tasks.
- Versatility Across Applications: SK QD bushings accommodate a wide range of shaft sizes and are compatible with various components like pulleys and sprockets. Their adaptability makes them suitable for diverse industries, including automotive, agriculture, and manufacturing, streamlining inventory needs.
- Durability and Reliability: Made from high-strength materials like ductile iron or sintered steel, SK QD bushings resist wear, corrosion, and galling. This durability ensures long-term performance, reducing maintenance costs and extending equipment lifespan in harsh operating conditions.
- Precision and Reduced Vibration: The keyed design prevents shaft rotation within the bushing, and a set screw enhances stability, especially in high-vibration environments. This precision fit reduces wear on components, improving machinery longevity and operational smoothness.
How to Choose the Right SK Type QD Bushing for Your Needs
Choosing the right SK Type QD bushing involves understanding your application's requirements to ensure compatibility, performance, and durability. SK QD bushings are widely used in industrial settings to mount pulleys, sprockets, or sheaves onto shafts, offering easy installation and removal.
- Determine the Shaft Size and Bore Compatibility: Measure the shaft diameter accurately to select an SK QD bushing with a matching bore size. SK bushings come in various bore sizes, typically ranging from ½ inch to 2-11/16 inches, and metric options like 25mm. Ensure the bushing's bore aligns precisely with the shaft to prevent slippage or misalignment during operation. A proper fit is critical for secure clamping and efficient power transmission.
- Assess the Torque and Load Requirements: Evaluate the torque and load your application will generate to choose a bushing capable of handling the stress. SK QD bushings are designed to withstand moderate to high torque, with torque capacities often up to 7,000 lbs/in, depending on the material. Select a bushing that matches or exceeds your system's demands to ensure reliability and prevent premature wear or failure.
- Verify Compatibility with the Driven Component: Ensure the SK QD bushing matches the hub design of the pulley, sprocket, or sheave you're using. The bushing's flange and taper must align with the component's bore for a secure fit. Check manufacturer specifications to confirm the SK series is compatible, as mismatched components can lead to vibration, inefficiency, or equipment damage during operation.
- Consider Keyway and Set Screw Requirements: Check if your shaft requires a keyway and whether the bushing includes one. SK QD bushings typically come with standard keyways, and some include set screws to secure the key, which is vital for high-vibration or vertical shaft applications. Verify the keyway size (e.g., 1/4 x 1/8 inch) matches your shaft to prevent rotation and ensure stable power transfer.
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