SDS Type QD Bushings

SDS Type QD (Quick Disconnect) Bushings are precision-machined, tapered components designed to mount sprockets, pulleys, or sheaves onto shafts securely. Made typically from steel or cast iron, they feature a split flange and a gradual taper for a tight, positive clamp on the shaft. Installation involves tightening included cap screws, while removal is simplified with reverse-threaded holes. Available in inch and metric bore sizes, they ensure easy, lubricant-free setup and removal. We maintain a comprehensive inventory of standard sizes and also offer custom QD bushings, including stainless steel options, upon request.

SDS Type QD Bushing Dimensions

Key Features of SDS Type QD Bushings

SDS type Quick Disconnect (QD) bushings are widely used in industrial applications to mount pulleys, sprockets, or sheaves onto drive shafts. Here are their key features, based on how they’re designed and function:

QD Bushings vs. Taper Lock Bushings

A QD bushing and a taper lock bushing are both types of mechanical bushings used to mount pulleys, sprockets, or other components onto a shaft, but they differ in design, installation, and application. Here are some key differences:

1. Design and Structure

• QD Bushing:
  • Features a flange with a set of threaded holes and a split barrel.
  • The split allows the bushing to compress tightly onto the shaft when bolts are tightened.
  • Uses a keyway for torque transmission and a cap screw system for securing the component.
  • The flange allows for easy attachment to the mounted component (e.g., pulley or sprocket).
• Taper Lock Bushing:
  • Has a simple, cylindrical design with a single taper and no external flange.
  • Features a split along its length and typically two or three threaded holes for set screws.
  • Relies on a tapered interface that mates with a corresponding taper in the component hub.
  • Uses set screws or grub screws to lock the bushing onto the shaft and component.

2. Installation and Removal

• QD Bushing:
  • Installation: Slide the bushing onto the shaft, align it with the component, and tighten cap screws into the flange to compress the bushing onto the shaft. The component is secured via bolts through the flange.
  • Removal: Loosen the cap screws and insert them into threaded jacking holes on the flange to push the bushing off the shaft, making removal quick and straightforward.
  • Advantage: The quick-disconnect feature simplifies installation and removal without requiring excessive force or special tools.
• Taper Lock Bushing:
  • Installation: Insert the bushing into the tapered bore of the component, align it on the shaft, and tighten the set screws to wedge the bushing between the shaft and component hub. The taper creates a tight friction fit.
  • Removal: Loosen the set screws and use a puller or tap the component to release the bushing. A small threaded hole may be used to assist in jacking the bushing out.
  • Advantage: Simple design with fewer parts, but removal can be slightly more involved compared to QD bushings.

3. Torque Transmission and Security

• QD Bushing:
  • Provides excellent torque transmission due to the keyway and the compressive force of the split barrel.
  • The flange design distributes forces evenly, making it suitable for heavy-duty applications with high torque or shock loads.
• Taper Lock Bushing:
  • Relies heavily on the friction fit created by the tapered surfaces and screw tightening.
  • Effective for moderate to high torque but may slip under extreme loads if not properly tightened or if the keyway is omitted.
  • Often used in applications where a compact, low-profile connection is needed.

4. Applications

• QD Bushing:
  • Commonly used in heavy industrial applications like conveyors, crushers, or large HVAC systems where quick maintenance and high reliability are critical.
  • Preferred when frequent component changes or adjustments are expected.
• Taper Lock Bushing:
  • Widely used in lighter to medium-duty applications, such as smaller pumps, fans, or gearboxes.
  • Popular in industries where space constraints or cost considerations favor a simpler, more compact bushing.

5. Size and Compatibility

• QD Bushing:
  • Available in a range of sizes (e.g., JA, SH, SDS, SK, SF, E, F, J, M, N) with standardized dimensions.
  • Typically larger due to the flange, which may limit use in tight spaces.
• Taper Lock Bushing:
  • Comes in a variety of metric and imperial sizes (e.g., 1008, 1610, 2517, 5050), often more compact.
  • Offers greater flexibility for smaller shafts or components due to its minimalist design.

QD Bushings	Taper Lock Bushings