# Metric collets for Makita **URL:** \ **Category:** Uncategorized\ **Created:** [January 28, 2023, 12:33am UTC](https://forum.onefinitycnc.com/t/metric-collets-for-makita/18428 "2023-01-28T00:33:00Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![349iq2345](https://avatars.discourse-cdn.com/v4/letter/3/bb73d2/32.png) [@349iq2345](https://forum.onefinitycnc.com/u/349iq2345)\ **Post date:** [January 28, 2023, 1:16am UTC](https://forum.onefinitycnc.com/t/metric-collets-for-makita/18428/2 "2023-01-28T01:16:09Z")
Hey Andros, > [@Andros](#): > > I am using an ER11 1/8 collet and it seems fine. So, is ER11 the correct size? **surely not.** ER collets do not match the Makita hand trim routers at all. The collets on the Makita are makita proprietary. The taper for a [collet](https://en.wikipedia.org/wiki/Collet) (on non-[tool-changer](https://en.wikipedia.org/wiki/Machine_taper)/non-[ATC](https://en.wikipedia.org/wiki/Automatic_tool_changer) systems) is machined into the end of the machine taper (or on cheap routers, directly into milling motor shaft) and **it only matches the collet it is made for**. > [@Makita Router not holding the bit](https://forum.onefinitycnc.com/t/makita-router-not-holding-the-bit/12844/11): > > | > > ![Makita_collet](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/5/4/54c55b58ddf47f23f1440bc94ca57843bc0ef7a1.png) > Makita collet > > | > > ![ER_collet](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/2X/8/81ae0dfb917808d571a0f71b96bfbae9c000c634.png) > > ER collet > > | > | --- | --- | Crucial for the ER collet is that it sits in a taper that must match exactly. Here I recently collected this general info on ER collet specification: #### The ER collet [REGO-FIX: 50th Anniversary of the ER Collet (1972–2022)](https://de.rego-fix.com/en/media-center/news/50th-anniversary-er-collet-1972-2022) The ER collet industry standards: - Old: [DIN 6499](https://www.beuth.de/en/standard/din-6499/2028736) - Current: [DIN ISO 15488:2006-01](https://www.beuth.de/en/standard/din-iso-15488/84605981) > #### ER collets > > The “ER” collet system, developed and patented by Rego-Fix in 1973, and standardized as DIN 6499, is the most widely used clamping system in the world and today available from many producers worldwide.[[7]](https://en.wikipedia.org/wiki/Collet#cite_note-7)[[8]](https://en.wikipedia.org/wiki/Collet#cite_note-8) The standard series are: ER-8, ER-11, ER-16, ER-20, ER-25, ER-32, ER-40, and ER-50. The “ER” name came from an existing “E” collet (which were a letter series of names) which Rego-Fix modified and appended “R” for “Rego-Fix”. The series number is the opening diameter of the tapered receptacle, in millimetres. ER collets collapse to hold parts up to 1 mm smaller than the nominal collet internal size in most of the series (up to 2 mm smaller in ER-50, and 0.5 mm in smaller sizes) and are available in 1 mm or 0.5 mm steps. Thus a given collet holds any diameter ranging from its nominal size to its 1-mm-smaller collapsed size, and a full set of ER collets in nominal 1 mm steps fits any possible cylindrical diameter within the capacity of the series. With an ER fixture chuck, ER collets may also serve as workholding fixtures for small parts, in addition to their usual application as toolholders with spindle chucks.[[9]](https://en.wikipedia.org/wiki/Collet#cite_note-9) Although a metric standard, ER collets with internal inch sizes are widely available for convenient use of imperial sized tooling. The spring geometry of the ER collet is well-suited only to cylindrical parts, and not typically applied to square or hexagonal forms like 5C collets. > > – Source: [Collet → ER collets – Wikipedia](https://en.wikipedia.org/wiki/Collet#ER_collets) --- _[View the full topic](https://forum.onefinitycnc.com/t/metric-collets-for-makita/18428)._