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$34.99 Each
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For use in router table only.

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Rockler Router Collet Extension for 1/2'' Shank Bits

Gives you the extra lift you need for comfortable, convenient above table bit changes, as well as additional depth of cut.
Item #
76% of 100

This collet extender allows you to change router bits from above the table—even without a lift! Even if you have a lift, they still make bit changes easier because you won't have to remove the insert ring. They're also great for custom made router tables with very thick tops, as they provide the additional depth of cut needed for many routing tasks. Use them with our Router Table Spline Jig (#59288, sold separately) to achieve full depth of cut when machining dovetail splines.

(1) Rockler Router Collet Extension
More Information
Brand Rockler
Weight 0.4300
Tech Spec
  • Allows above-table bit changes
  • Shank Size: 1/2"
Type Router Adapter
3.8 / 5.0
27 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Quality tool - easy to use
This extension is of high quality and well worth the money. In addition to providing some extra reach for bits with a short shank, it also has the jam nuts on the end so that bits can be swapped without having to remove the motor from the base. You should definitely get one of these extensions if you use your router in a table.
June 4, 2020
2 months ago
Woodworking Experience:
Length where I need it
I have lumbered a great deal of white ash thanks to the emerald ash borer. I used a chain saw to prepare the slabs, and that has resulted in really crude rough-sawn lumber. In order to prepare the boards, I plane the first side using my router and a sizeable bit with 1/2 in shaft. This extension gives me the necessary distance to bring the bit to the lumber. It offers more latitude in the distance from the jig to the face of the board so that I don't have to be exact with the setup and consequently have a fuller range of the plunge router to pare away the very rough cut, twisted, and warped material.
April 20, 2020
1 year ago
Woodworking Experience:
Robust extension. Did what I needed it to do. has enough weight and well balanced.
April 7, 2020
3 months ago
Woodworking Experience:
Router bit extension
Good product. Welcome addition to my router bits
March 22, 2020
4 months ago
Woodworking Experience:
The collet extender is fine, but I found that it would not do what I wanted. I wanted to return it but found that you have a very poor return policy which makes returning it not worth while. Guess I'll just drop it into the bottom of my tool box and not buy anything more from Rockler. Too bad.
September 26, 2019
10 months ago
Woodworking Experience:
Collet Contentment
Top quality, works perfectly, great addition to my router accessories..
July 2, 2019
1 year ago
Woodworking Experience:
Everything that was promised.
I love this fact if a man could marry a tool, I would marry this one. If only Hillary were elected:(
May 13, 2019
1 year ago
Woodworking Experience:
Very solid
March 23, 2019
1 year ago
Woodworking Experience:
Router collet extention
I'm making a walnut slab coffee table, and I needed to flatten it. This extension, along with an inch and a half bit and a shop built sled, doe the job that I needed done.
March 2, 2019
1 year ago
Woodworking Experience:
Extension works great!
January 25, 2018
over 2 years ago
Woodworking Experience:
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Browse 8 questions Browse 8 questions and 20 answers
Why did you choose this?
Rockler Store
Space is tight give me more room
Tony on May 22, 2020
I have the old stile router table<br />This will give me the extra clearance<br />That I need for my longer bits
Rodney J on Jan 26, 2020
Space is tight give me more room
Tony on May 22, 2020
Just made a sled and carriage to flatted wood slabs and I need this to get the proper depth of cut.
Stephen H on Apr 1, 2020
I have the old stile router table<br />This will give me the extra clearance<br />That I need for my longer bits
Rodney J on Jan 26, 2020
For deeper bowl cuts
Perry H on Dec 15, 2019
router is at the top of its adjustment capability in my router table.
Bill on Nov 22, 2019
Needed to extend for a jig
R W on Oct 24, 2019
Your the best company I know for wood working tools
Robert R on Sep 30, 2019
I need more depth of cut for routed bowls/trays.
Byron D on Aug 13, 2019
I've needed one in the past and didn't have one, and just wanted to pick one up so it didn't happen again
Matt S on Aug 12, 2019
Need to extend spoilboard router bit further
John R on Jul 5, 2019
I needed to extend my dove tail bits for my Leigh Dovetail Jig.
john h on Mar 4, 2019
I plane down cut off walnut tree slabs to make them smooth and make different projects out of slabs.
Paul B on Mar 1, 2019
This will enhance bit changes in my router table
Jon L on Feb 15, 2019
looks good
Ken*White U on Jan 22, 2019
I ordered this to work with the new Rockler router table I just received.
Steve H on Dec 16, 2018
For a router sled I made.
Christopher R on Dec 9, 2018
To level boards for plaques using a home made jig
reddor55 on Nov 24, 2018
Needed for a router sled
Cory O on Nov 22, 2018
router planer
Angel Diaz A on Aug 21, 2018
Saw it on a youtube channel
Joe G on Aug 17, 2018
Going to be using router to flatten live edge slabs and will need the extra length for bit.
Bob C on Jun 15, 2018
Very difficult to adjust my bits while in a table. Have been doing task poorly and decided to use this extension for reliability.
Joseph B on May 31, 2018
Customer has 15% discount received in the mail. The promotion code is RTH70. Customer number is 8974846.
Calvin I on May 2, 2018
required for certain router setups I preform
john e on Mar 8, 2018
It is priced right and it will do what I want it to do.
Stephen W on Mar 7, 2018
for planning slabs
Charles S on Dec 9, 2017
To router-out bowl inside as deep as possible.
Barbara K on Nov 28, 2017
to accomodate for extra thickness of my homemade router table
timber doodle on Apr 23, 2017
Using my Dewalt plunge router in my router table does not allow most of my bits to sit high enough for many cut depths. This looks like just the ticket and the reviews were good.
Christopher C on Nov 5, 2016
Excellent for my router lift
Scott W on Oct 1, 2016
to rout deeper
Lisa T on Sep 25, 2016
this will help us in a number of router jobs
Melanie L on Apr 26, 2016
Needed for my router
Patti Y on Oct 31, 2015
Needed for router table
JOHN S on Jul 6, 2015
Just made a sled and carriage to flatted wood slabs and I need this to get the proper depth of cut.
Stephen H on Apr 1, 2020
For deeper bowl cuts
Perry H on Dec 15, 2019
It says to only use with variable speed router; what are the guidelines for speeds relative to bit sizes?
Roger on Jan 14, 2017
BEST ANSWER: I have used both the 1/4 and 1/2" extensions for about 2 yrs., occasional use, with no problems. I use them with a Freud 3 1/4 hp. router mounted on a router table. The guidelines re: speeds may vary based on the router manufacturers recommendations. For my Freud the recommendations are:
Bit Diameter Max RPM
1" 24,000
1-1/4 18,000
2-1/4 16,000
3-1/2 12,000

I recommend you contact your router manufacturer for their speed recommendations. I normally run my router on 18,000 rpm, and have used both extensions at that speed with excellent results.
this bit is 1/4 to 1/2 '' ?
awildo B on Jan 19, 2016
BEST ANSWER: Rockler makes two extensions. This one will fit router bits with a 1/2" diameter shank. They also sell another extension for router bits with a 1/4" diameter shank. The extension themselves (both of them) require a router with a 1/2" collet. I recommend that you seriously consider getting both sizes (for 1/4" and 1/2" shank router bits). These are heavy duty extensions. I have both and have been perfectly satisfied.
What size wrenches do you need for Router collet extension?
Steven Riley on Jan 14, 2019
BEST ANSWER: The extension goes into the router the same as any router bit and then to tighten the router bit into the extension requires a 1 1/8" wrench at the top and a 3/4" wrench at the bottom. The top is the same wrench used to tighten the collet on your router.
what is the diameter of the collet fastener? I need this for a flush trim bit, my current extender is too wide to use with a .75" flush trim bit
Alex B on Apr 28, 2016
BEST ANSWER: The diameter on the 1/2 in. extender is 1 3/8 in. The diameter on the 1/4 in. extender is 7/8 in.
What is the diameter of the collet?
James B on Dec 18, 2015
BEST ANSWER: There are 2 models of this extender. One for 1/2 Inch bits and one for 1/4 inch bits. both have 1/2 inch shanks. So you need a router with 1/2 inch collet to run either one. I have a big Milwaukee router and they did not work because the router would not lower enough to get the bit at a working height. In other words they were too long. They might work with a plunge router or some other arrangement where the router is not fastened to the bottom of the table.
Could anyone tell me the distance it will extend your bit. From the first notch where it seats against the routers collet to the top of the collet extension?
Monte M on Jan 23, 2016
BEST ANSWER: This distance is about 2 inches. I purchased one of these but can not use it because my router motor dose not go low enough to operate safely.
Will this fit dewalt 611 router?
Whitney A on Jan 8, 2020
BEST ANSWER: No it will not- the desalt is metric
can this be used in a hand held router to increase the depth of cut using a dish cutting bit?
scott m on Dec 1, 2019
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