ER11 Collet Ultra High Precision 0.005mm 5u

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ER Collet Ultra High Precision 0.005mm / 5u run-out. These are not your blue/yellow boxed collets that are the cheapest of cheapest of collets that do not specify a precision value. A high precision collet allows for quieter machining, longer tool life and greater cut accuracy.

Available in ER11, ER16, ER20 and ER25 in common sizes 3.175mm (1/8"), 4mm, 6mm, 6.35mm (1/4"), 8mm, 10mm and 12.7mm (appropriate to ER size). Clamping range is that of nominal inner diameter size -1mm (eg. 6mm would accept 5mm to 6mm). 

How to check what diameter you have

ER Collet Outline

ER ColletLengthDiameterRange
ER-11 18 mm 11.5 mm 0.5—7 mm
ER-16 27.5 mm 17 mm 0.5—9 mm
ER-20 31.5 mm 21 mm 1—13 mm
ER-25 34 mm 26 mm 1—16 mm
ER-32 40 mm 33 mm 1—21 mm
ER-40 46 mm 41 mm 3—26 mm

10 Reviews Hide Reviews Show Reviews

  • 5

    Posted by Paul on 1st Jun 2022

    Very happy with the this, it is a very good fit for my bits and spindle. Recommended!

  • 5
    Er collets

    Posted by Bruno Antonello on 20th Oct 2021

    Excellent concentricity Use them for thread milling Trust Adams stuff AAA +++

  • 5
    ER Collet 6mm

    Posted by Pete on 5th Oct 2021

    These are great. All products I've gotten from Adam's Bits are quality, and always in the mail on the same day.

  • 5
    ER11 Collet Ultra High Precision 0.005mm 5u

    Posted by Garry on 20th Sep 2021

    Runs smmoth as silk, great value

  • 5

    Posted by Garry Wilson on 9th Sep 2021

    Excellent product, great delivery time

  • 5
    Buy this now!!

    Posted by David on 5th Oct 2020

    I highly recommend these collets due to the high precision tolerance compared to other brands. I've purchased other ER11 collet brands from ebay and a couple of other sites due to being affordable, big mistake. Collets from the other brands (came in yellow boxes) had loose inner diameters when inserting bits in, as a result my cuts had uneven lines. I've since had no issues after using Adam's collets.

  • 5
    ER Collet

    Posted by Don Rann on 8th Jun 2020

    Another quality product at the right price from Adam's Bits. Shipping was fast, as usual. Very happy.

  • 4
    Very good.

    Posted by Andy May on 10th Jul 2019


  • 5
    ER11 Collet

    Posted by Harley Wolfe on 7th Apr 2019

    Fast delivery, extremely low run-out, perfect for my little 6040 machine