ROYAL POWER-BLOCK™ I.D. WORKHOLDING
For Milling Applications
Power-Block™ I.D. Workholding
  • The Royal Power-Block™ I.D. Workholding System enables secure gripping on the internal bore of a workpiece for full external machining access.
  • Pullback action draws workpiece securely against a ground locator for precise, consistent z-axis positioning.
  • Unit can be mounted to a traditional machining center table and can also be used in 4th and 5th-axis applications.
  • Fixture is designed to be actuated via hydraulic pressure and may also be actuated pneumatically for lighter-duty applications (contact us for details).
  • For use with all Royal precision mandrels, stops, and sleeves. These items are sold separately.
  • Heavy-duty all steel construction with a large double-acting piston provides high clamping force.
  • Configured with both side and bottom ports for plumbing flexibility.
  • Multiple units can be plumbed in series for single-source actuation.
  • Ideal for high-production applications on vertical, horizontal, and five-axis machining centers.
  • Tombstone and angle plate compatible.

How to Order:

  1. Choose the appropriate body assembly based upon your application.
  2. Choose the appropriate mandrel (models A-E) based upon the diameter you need to All mandrels and bodies share a common mounting interface for full interchangeability.
  3. If required, choose the appropriate part locator to provide a ground banking surface for the workpiece.
  4. Choose the appropriate expanding sleeve based upon the mandrel and diameter you need to grip.

Step 1 – Choose Body Assembly

POWER-BLOCK™ I.D. BODY – For Machining Centers

Proudly Made In USA
  • This body can be mounted to any machining center table, 4th/5th-axis rotary tables, angle plates, tombstones, etc.
  • Body weight (as shown) is 22lbs.
  • Order mandrels, locators, and sleeves separately.

Note – dimensions shown without optional part locator. See mandrel chart for dimensions C, D, and E.

Royal Power-Block™ I.D. Assembly

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Step 2 - Choose Mandrel

  • Choose appropriate mandrel model according to gripping range.
  • All Royal mandrels have a common precision ground interface for complete compatibility with all Royal I.D. body assemblies.
  • Order body assembly, locators, and sleeves separately.

Royal Mandrels

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Step 3 - Choose Part Locator

  • Optional part locator bolts to the front of the mandrel and provides a precision banking surface for the workpiece to locate against.
  • Order body assembly, mandrels, and sleeves separately.

Royal Part Locators

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Step 4 - Choose Expanding Sleeve

  • Order expanding sleeves according to mandrel models A thru E.
  • All expanding sleeves are fully sealed against coolant and chip penetration.
  • Parallel grip ensures full-length part contact for optimum accuracy and grip force.
  • All sleeves collapse 0.005" below nominal ground size to ensure easy part loading and unloading.
  • Order body assembly, mandrels, and locators separately

Royal Expanding Sleeves - Model A

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Royal Expanding Sleeves - Model B

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Royal Expanding Sleeves - Model C

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Royal Expanding Sleeves - Model D

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Royal Expanding Sleeves - Model E

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*Not sealed due to limited wall thickness.
Note – sleeves larger than 2-1/2" dia. are 0.28" longer than dimension E and terminate flush with the face of the expanding rod.