< ER Collet Extensions

Collet Extension ER - 1/2" to 1/4" & 1/2"

Regular price £30.00
Regular price £0.00Sale price £30.00
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This precision machined extension provides 50mm of additional height, computer balanced to minimize vibration and ensure perfect concentricity. The multi-slit ER20 collets securely grip over a 1mm range, allowing 6mm, 1/4", 12mm and 1/2" shank router bits to be used.
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Collet Extension ER - 1/2" to 1/4" & 1/2"
Regular price £30.00
Regular price £0.00Sale price £30.00
  • 3 Year Warranty
  • Multi slitted collet fully grips around the router bit shank for safe, secure routing
  • Engineered from precision ground steel with unrivalled accuracy less than 0.01mm
  • Computer balanced to minimize vibrations ensuring the router bit runs perfectly true
  • Transform router tables, bases and jigs, instantly adding 50mm of height to any router bit
  • 1/2" shank extension for use with 1/4" & 1/2" shank bits
A router collet extension is perfect to use when an increased height of router bits is needed on router tables, routing jigs or router bases. This extension gives 50mm of additional height and allows you to easily change router bits above your router table. Simply insert the extension into your 1/2" router, then insert the router bit into the 1/4" or 1/2" ER20 collet and secure it by tightening the collet nut using the supplied spanner.

The extension is supplied with standard 1/4" & 1/2" multi slit ER20 engineering collets which fully grip around the router bit shank for safer routing with less vibration. The collet is made from heat treated precision ground spring steel which gives a runout accuracy of less than 0.01mm. The 1/4" collet has been specifically designed to grip over a 1mm range from 6.5mm down to 5.5mm meaning both 1/4" imperial and 6mm metric shank router bits can be used in the extension. The 1/2" collet has been designed in the same way to grip over a range from 13mm down to 12mm meaning both 1/2" imperial and 12mm metric shank router bits can be used. The extension body has been precision machined from a single piece of high-quality steel which has been computer balanced to minimize vibrations to ensure the extension and therefore router bit will run perfectly true.

The precision machined body alongside the ER20 collets are the ideal combination to give extra height to your router bits while maintaining complete accuracy. The extension has a 1/2" shank and an overall length of 90mm. ©
  • BrandRutlands®
  • Product CodeR5093
  • Shank1/2”
  • 1/4" ColletER20 6.5mm – 5.5mm
  • 1/2" ColletER20 13mm – 12mm
  • Extension50mm
  • Overall Height90mm
  • Collet Nut Diameter28mm

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We will happily accept returns within 30 days. For more information about returns, visit our Returns page.


Customer Reviews

Based on 9 reviews
Real Qulaity

I was tempted to buy one of these from Amazon for half the price but as it's going in the router and spinning rather fast I thought it better to trust Rutlands rather than something from Amazon.

Out of the box it's a weighty item and feels very good quality. It certainly performed well when used. I have a box joint jig so needed a little extra height on the router bit however it will also help with the bowl/tray router bit I bought last month but am yet to try

Neil S.
I bought this item as I needed to

I bought this item as I needed to safely cut a deep rebate for some double glazed window frames. I had already tried an extender from a well known online retailer for around half the price but that vibrated so much it nearly broke my router table and me. Stumping up for this item it was a nice surprise to have the spanner included, reducing the price delta, and the quality is superb. It has been used extensively now with no issues.

Jonathan M.
Good built quality and not too chunky or heavy, it...

Good built quality and not too chunky or heavy, it's doing a good job so far!

Jason S.
To paraphrase, "there is no greater fool than the ...

To paraphrase, "there is no greater fool than the man, or woman, who knows the cost of everything and the value of nothing" and it seems apt here. I do, however, know the cost of this collet extension - £30. But the value to me is far greater. It is beautifully machined, works perfectly and I'm sure it will outlive me and a few more generations besides. It's made my time in my workshop considerably easier and it's no longer a pain to change router bits at my router table. If you value quality and need a router extension collet, buy this one. The £30 is arbitrary, but in this case, the quality and value exceeds the cost.

John C.
Well made item on offer at a very good price...

Well made item on offer at a very good price. Gives a useful extension to router shanks. Recommended.

Collet Extension ER - 1/2" to  1/4" & 1/2"

Collet Extension ER - 1/2" to  1/4" & 1/2"

Collet Extension ER - 1/2" to  1/4" & 1/2"