The shank is the part of a mounted accessory held by the rotary tool. Its diameter is a compatibility dimension, not a description of the polishing head. Check it before comparing head shape, size or pack quantity.
Read the right dimension
Listings may describe a shank diameter and one or more head dimensions. For example, a diameter associated with the mounting shank answers a different question from the width of a felt head. Identify which dimension each figure describes.
2.35 mm and 3 mm are distinct nominal sizes. Do not assume that a holder intended for one automatically accepts the other. Check the tool or handpiece documentation for the exact sizes supported.
Check the collet or chuck
Identify the accessory holder on your own tool. A collet may require the appropriate size, while a chuck has a stated clamping range. The tool's documentation, rather than appearance, should establish what it accepts.
Check the complete setup: motor, flex shaft, handpiece and holder may be separate components. Compatibility with the motor's name alone does not establish that an accessory fits the handpiece currently attached to it.
| Accessory information | Tool information to compare |
|---|---|
| Shank diameter | Supported collet size or chuck range |
| Head dimensions | Working clearance and access |
| Accessory type | The operation the tool and accessory are intended for |
| Operating limits | The limits stated for the specific accessory and tool |
Choose the head for the task
Once the mounting size is confirmed, compare the working head. A cylindrical felt point and a bullet-shaped point contact a workpiece differently. Their access and contact area also depend on the actual head dimensions, not just the shape name.
Keep the finishing step clear. A felt accessory used for polishing should not be treated as a substitute for an abrasive intended to remove material. Check the stated material and application for the selected item.
Check operating limits
Follow the tool and accessory instructions, including the stated operating limits and required protection. A product image does not establish a maximum speed. If the listing does not provide information you need for your setup, request it before use.
Do not force an unsuitable shank into a holder or infer that an improvised adapter is acceptable. Resolve the compatibility question using the relevant documentation.
Order the correct configuration
- Confirm the shank diameter.
- Confirm the head shape and dimensions.
- Check the selected pack quantity.
- Review included parts and required supporting equipment.
A change in pack quantity does not by itself identify a change in diameter or head size. Check each option separately.
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