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Keyless Bushing (Fastening Fittings)

An online store for keyless bushings (fastening fittings). In MISUMI's e-catalog, specifications and dimensions such as the shaft hole diameter, allowable torque, main body material, surface processing, boss diameter and delivery date can be selected in single clicks, making it easy to find the desired keyless bushing.

[What is a keyless bushing (fastening fitting)?]
A keyless bushing is a fastener that can fix shafts and hubs (gear, sprocket, pulley, etc.) without key grooving. By tightening the bolt, drag and friction force are generated in the tapered fitting part, causing it to fasten by the resultant force.

Types of Keyless Bushings

To accommodate various applications and space constraints, keyless bushings are available in several configurations:

  • Flanged Keyless Bushings: Provide enhanced axial support and easier alignment during installation.
  • Straight Type: Compact and ideal for general-purpose fastening.
  • Nut Tightening Type: Uses a threaded nut to apply uniform clamping force—suitable for precise torque control.
  • Thin Wall Keyless Bushings: Designed for space-saving applications without compromising holding power.
  • Direct Mounting Type: Enables quick and simple installation directly onto the shaft.
  • Sleeve Type: A cylindrical bushing that fits between the shaft and the hub, allowing for flexible usage across shaft diameters.
  • Hydraulic Keyless Bushings: Offer quick-release and high-precision fastening through hydraulic pressure—ideal for high-torque or frequent-assembly environments.

Body Material Options

MISUMI offers keyless bushings in a variety of materials tailored to performance, strength, and corrosion resistance:

  • Steel: Commonly used for its high strength and durability in general industrial environments.
  • Stainless Steel: Ideal for corrosive or cleanroom environments such as food processing or medical machinery.
  • Aluminum: Lightweight and corrosion-resistant, suitable for low-load or weight-sensitive applications.

Advantages of Using Keyless Bushings

  • No Keyway Machining: Reduces machining time and cost.
  • Easy Installation and Removal: Bolt tightening simplifies assembly and minimizes shaft damage.
  • High Torque Transmission: Friction-based clamping distributes pressure evenly across the shaft.
  • Backlash-Free Operation: Maintains precise alignment in dynamic or high-speed machinery.
  • Versatile Designs: Options like thin wall, disc clamping, and hydraulic types suit everything from compact systems to heavy-duty industrial machines.

Applications

Keyless bushings are used across a wide range of industries:

  • Automation systems
  • Packaging equipment
  • Pumps and compressors
  • Machine tools
  • Printing and textile machinery

Their ability to secure components like sprockets, pulleys, and gears without keys makes them a preferred solution in modern mechanical designs.

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