Your cart is empty.
Your cart is empty.Product Description
R8 taper shank ER collet chucks are typically used on manual milling machines. The R8 taper end fits into a machine spindle and the ER collet nut is compatible with ER collet. The ER32 nut is compatible with the ER32 style collet and the ER40 nut works with the ER40 style collet. ER collets are used to hold all the machine tools with a round shank. These R8 shank ER collet chucks deliver the quality significantly above average on market. The total indicator runout (TIR) is less than 0.0002". The MAX RPM on the manual milling machines is 8,000. The manufacturer of the collet chucks inspects and produces them in a highly sophisticated lab and factory. You can hardly expect the collet chucks from the other MFG are of the same quality.
Features:
- Made of high-grade tool steel
- Hardened and precision ground
- Max TIR 0.0002" O.D to I.D
- Drawbar thread: 7/16"-20
- MAX RPM: 8000
Caution
- During testing and inspecting, be sure each component and all the parts are wiped clean; be sure the installation must be in place; otherwise, the accuracy will be greatly affected.
- During the inspection, whether the spindle has an error also has a great impact on accuracy.
Features
Under normal working conditions, the groove of the R8 works as a guiding function and helps improve the rigidity. When the spindle hole becomes larger, this feature will not function.
Please note that there is no wrench included.
Design, Assemble, and Dissemble
Eccentric Design, ISO 15488:2003(E)
The inside of the ER collet nut is intentionally designed like off-centering to help mount the ER collet much easier. It is in accordance with the requirements listed in ISO 15488:2003(E). If it is made symmetrical, the ER collet with the diameter larger than the inside size of the collet nut cannot be installed.
Assemble
Insert the ER collet into the nut at an angle. Lock it onto the eccentric groove of the collet nut and push it in. (Insert the cutter right after the step, before connect it to the holder/chuck/arbor.)
Inspection
Inspect the RPM of the ER collet, ER collet nut, ER collet holder/chuck/arbor, etc.
Dissemble
Take out the tool bit, press the end of the ER collet until the collet off the position. Push it out of the nut. (after take out the nut out of the holder.)
Cautions before Inspecting the Accuracy
Clean all tools and parts
This is an ultra-precision workholding tool. When doing the inspection to ensure that each part is wiped especially clean, and the installation must be in place, otherwise it has a great impact on the accuracy
Spindle Accuracy
When testing, whether the user's machine tool spindle has errors on the accuracy also has a great impact. So you need to ensure that the accuracy of the spindle of the user's test machine must be high.
ER Collet Accuracy
Please make sure that the accuracy of the ER collet must be high, many ER collets are marked as 0.0005", many of them cannot reach it.
Entire Accuracy
If the accuracy of the collet in the hands of the customer is low, the accuracy of our toolholder is no longer high enough to detect the accuracy.
Adam
August 26, 2025
This thing is awesome! It's a bit of a trick to get your collet to seat properly in the top cap, but once you figure out how to snap it in, its 100% spot on. I use it for turning bespoke pens, which require very, very tight tolerances and this thing gets it done on point.
R. S. Winsor
August 10, 2025
One of my favorite milling machine purchases. This is very well finished, it holds the tool true and very secure. Runout appears excellent, as I'm getting very accurate milling with this - CNC grade tolerances. The threads are very high quality and the price is amazing.
Jeff S
August 4, 2025
Ok, first off, whenever I receive a new machine tool part, I run it through the sonic bath to remove any grease, machining crap, etc., and after cleaning this chuck - nothing! No metal shavings, the screens are clean.Secondly, this chuck is well machined, and the runout is 0.0002. In the video this is on top of the .0003 runout on the mill spindle. The threading is way beyond any specification requirements, they are the best. Just added it to the tool bin. It passes.As for the name, this one is marked "CanCNC." Some have made a big deal about this, but if you get a quality tool and it fills the need, so what! Use it and move on! I have purchased many tools from Accusize, and have not been let down yet.It has been mentioned that the hole is off center. It's supposed to be like that. Read the DIN ISO 15488 specifications. It's called a setting angle.This chuck is highly recommended!
Gregory T Reid
July 29, 2025
The first thing I did was to check the runout. My PM-30MV mill spindle runout is barely measurable at 0.00008. The body OD of this R8 ER32 chuck shows 0.0001 when mounted, but the inside surface of the ER32 surface (where the collet will mount) shows 0.0003. So it just barely misses its advertised 0.0002 spec, even when allowing for my spindle 0.00008 addition. But it is PLENTY good enough for my hobby machinist needs.The machining is beautiful; fits perfectly into my mill, and the nut is smooth. Two small things to mention:- It is laser etched with "CanCNC", not "Accusize" as shown in the listing photo. Others have mentioned this. I'd expect that ordering from Accusize should truly be an Accusize brand. I'd hope that the manufacturer will comment on this.- The flats across the chuck's body are spaced at 41.90mm. Perhaps that's normal for a true Bridgeport mill. Mine is a Precision Mathhews mill and the flats on its spindle are 40.85mm. The PM supplied spindle C-wrench measure at 40.92mm, so it's a fairly snug fit. And so the wrench will NOT fit this Accusize chuck body. No big deal (I'll use my mill to knock a mm off of the body flats), but thought I'd mention it.
Bill Long
July 3, 2025
nothing to dislike, I used this to convert a drill press to a mill
Customer
May 17, 2025
Received R8-ER32 and noticed is NOT Accusize as advertised. It is an off brand I have never heard of "CanCNC". Appears to be deceptive advertising. The product does look nice. I will not know the quality until I use it and throw a dial indicator on it.
Joshua fields
March 5, 2025
I see many complaints that the machining is inconsistent or off center. That’s not the cast they just don’t know or didn’t read the instructions how to use the tool. Please read the instructions and see how the collet properly is inserted into this holder.
Michael A.
February 7, 2025
Looks perfect works as expected. Meticulously machined all services are ground and there are no blemishes nicks dings scratches or burs. I returned several other brand R8 - ER25 collet chucks which were complete junk by comparison.
rjk
February 2, 2025
Very good quality; extremely accurate.
Dwayne Dosch
January 29, 2025
This tool stated clearly that the FNC thread was 1/2" - 13tpi. It is in fact 12mm x 1.75mm pitch. This required that I purchase suitable materials to fabricate a new draw bar. This req'd that I waste time finding a local supplier of bolts with that pitch and then driving down there to try it (across the city) just to confirm my strong suspicions (it's difficult to get a real good feel for the fit of the thread gauge when inserted into the MT shaft)The tool otherwise seems, otherwise, to be produced with good fit and finish and the one ER collet I tried was easy to install and remove.I have NOT yet used this in manufacturing due to that draw bar issue.The tool was received in a timely manner and well packed.
tony
December 29, 2024
Been using this for a while now. No problems.
Recommended Products