Receiver-side shank
The C dimension identifies the shank that must fit the receiving holder.
Catalog reference view. final supplied configuration confirmed by quotation.
C-ER
Straight Shank ER Collet Chuck Extensions
Overview
Straight shank ER extensions in 16, 20, 25 and 32 mm shank diameters.
AvailabilityConfirm before order
Lead timeQuote based
Product details
Straight shank ER extensions add a collet-clamping end to a selected cylindrical shank. The catalog lists several shank diameters, ER sizes and lengths rather than one universal extension. Match the receiving holder, shank engagement and full assembled envelope before choosing an extension for deep or otherwise restricted tool access.
Tool-side ER system
Select the ER family and individual collet bore independently of the outer shank.
Complete assembly envelope
Check total L, L1 and nut diameter against the pocket and fixture drawing.
Specifications & model range
Dimensions are in millimeters unless otherwise stated. Confirm the final drawing before ordering.
- Shank diameter
- 16-32 mm
- Collet systems
- ER16-ER40
- L1
- 50-180 mm
7 catalog rows
| Ordering family | Total L | L1 | Shank C | Nut D |
|---|---|---|---|---|
| C16-ER16 | 85.1/135.1/185.1 | 50/100/150 | 16 | 28 |
| C20-ER16 | 85.1/135.1/185.1 | 50/100/150 | 20 | 28 |
| C20-ER20 | 100.5/160.5/175.1/220.5 | 60/120/140/180 | 20 | 34 |
| C20-ER25 | 101/151 | 50/100 | 20 | 42 |
| C20-ER32 | 101.5/151.5 | 50/100 | 20 | 50 |
| C25-ER16/20/25/32/40 | 101-185.1 | 50-150 | 25 | 28-63 |
| C32-ER32/40 | 111.5/115 | 60/50 | 32 | 50/63 |
No matching model in this table. Try a shorter code or send us your drawing.
Ranges and slash-separated values describe catalog families, not every possible combination. Confirm the complete model and drawing before ordering.
Shipping photos & packing
Agree the packing method and photo requirements when confirming your order.
Order-specific photo confirmation
Verified dispatch photos for this series have not been uploaded. Request photographs of your selected model, protective packing and shipping label when confirming your order.
Discuss packing requirementsPhotos to confirm before dispatch
Use this checklist to agree what should be documented for your selected model.
- C–ER–length code visible
- Long shanks supported to prevent contact damage
- Nut and ordered collets inventoried
Stock, dispatch date and shipping method are confirmed with the quotation. Website images are not live inventory evidence.
Application scenarios
Typical selection contexts for this series, not customer project claims. Confirm machine compatibility and cutting conditions for your setup.
Deep feature access
Considering added tool reach where the complete assembly can clear the workpiece.
Special fixtures
Positioning a collet-clamping end within a constrained fixture layout.
Extension replacement
Matching a C-ER code and dimensions in an existing tooling arrangement.
Related product series
Compare alternative interfaces and complementary tooling. A related series is not automatically interchangeable.
C-ERM
Straight Shank ER Collet Chucks Type M
Models and specifications
ER8-ER40
ER Precision Collets
Models and specifications
BT30 / BT40 / BT50
BT ER Collet Holders
Models and specificationsDoes C25 mean this extension clamps a 25 mm tool?
No. C25 identifies its cylindrical shank. Tool clamping depends on the selected ER size and collet.
Can I use the longest version by default?
Select only the reach needed and review the assembled setup. This page does not establish performance for every extension length.
Is the nut diameter relevant to pocket access?
Yes. Compare the complete outer envelope, not only the cylindrical shank diameter, with the available space.
Are collets included with each extension?
Package contents require quotation confirmation. List the individual collets needed for your tools.