Tool · Router and spindle mounts
Router and spindle mount size finder
Pick the mount size you measured or your router's size to see the bodies made to it, the labels makers use, rings to other sizes and the dust boots for it.
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Short answer
Pick the mount size you measured, or the size your router or spindle maker states, to see the bodies made to it, the labels makers use for it, the rings and shims to other sizes, and the dust boots for it. Every size shown is a maker's own label.
- 52 mm mounts
- 65 mm mounts
- 69 mm mounts
- 71 mm mounts
- 80 mm mounts
Choose your mount size to see the key facts and what fits. Each fact links to its source on the full page.
All mount sizes
The sizes at a glance
| Mount size | Labels makers use | Routers and spindles made to it | Rings and shims to other sizes | Dust boots for this size |
|---|---|---|---|---|
| 52 mm mounts | 52 mm. Genmitsu's DS52 page gives 52 mm as 1.65 in in its text and 2.05 in in its spec table. Genmitsu also lists 42 mm mounts, and SainSmart's 4040-PRO article describes a 44 mm sleeve. | Genmitsu 300 W spindle: 52 mm, 12-48 V DC, ER11 collet, 3,000 RPM at 12 V to 12,000 RPM at 48 V | SainSmart's 4040-PRO setup article says the 52 mm mount has an internal sleeve that holds 44 mm motors such as standard 775 motors | Genmitsu DS52 (52 mm spindles; 32 mm inner and 38 mm outer vacuum port). Genmitsu says its DS69 is not compatible with 52 mm spindles. |
| 65 mm mounts | 65 mm. Sienci gives the AutoSpin body as 64.8 mm and says it fits 65 mm mounts; Genmitsu's DS69 shoe is labeled 65-69 mm. | Makita RT0701C class (FoxAlien) and RT0700/RT0701 (Sienci); Carbide 3D Compact Router (65 mm body); Sienci AutoSpin (64.8 mm); PwnCNC 65 mm ER11 motors; Onefinity Redline 65 mm 1.5 kW; Carbide 3D 65 mm VFD Spindle Kit | PwnCNC reducing shims 69 to 65 mm (25 or 75 mm high) and 80 to 65 mm (42 or 90 mm high) | Carbide 3D Sweepy 2.0 65 mm (Compact Router, VFD kit or Makita); Genmitsu DS69 (65-69 mm). PwnCNC's PwnBoot is 80 mm only, with a 65 mm email waitlist; Onefinity's Suckit SM does not fit 65 mm spindles. |
| 69 mm mounts | 69 mm for the DeWalt DWP611 class (FoxAlien, Carbide 3D, Genmitsu); Sienci lists its 71 mm LongMill mount for the DWP611 | DeWalt DWP611 class (FoxAlien's 69 mm Z clamp, Genmitsu's ZC69 example, Carbide 3D's 69 mm Sweepy 2.0 for the DeWalt trim router) | PwnCNC reducing shim 69 to 65 mm, 25 or 75 mm high | Carbide 3D Sweepy 2.0 69 mm (DeWalt trim router); Genmitsu DS69 (65-69 mm, 32 mm inner and 38 mm outer port) |
| 71 mm mounts | 71 mm (Sienci, for the DWP611 and Bosch Colt); FoxAlien and Carbide 3D call DWP611 parts 69 mm | DeWalt DWP611 and Bosch Colt, per Sienci | Not confirmed | Sienci says its 71 mm LongMill mount will not work with the MK2 dust shoe. |
| 80 mm mounts | 80 mm mount, 80 mm clamp (VEVOR), 80 mm holder (SainSmart), 80 mm body (VEVOR) | Carbide 3D 80 mm water-cooled spindle; PwnCNC 80 mm ER20 motors (1.5 kW at 110 V, 2.2 kW at 220 V); Onefinity Redline 80 mm 1.5 kW (110 V) and 2.2 kW (220 V); VEVOR 2.2 kW spindles (listing claims) | PwnCNC reducing shims 86 to 80 mm (60 mm high), 89 to 80 mm (44 or 65 mm), 108 to 80 mm (44 mm) and 80 to 65 mm (42 or 90 mm) | Carbide 3D Sweepy 2.0 80 mm (in the 80 mm kit); Onefinity Suckit SM (80 mm only); PwnCNC PwnBoot (80 mm only, 4 in intake). Sienci says its 80 mm LongMill mount will not work with the MK2 dust shoe. |
Sizes are makers' labels
Each size page lists what makers call their parts, read on 2026-10-11. We do not measure routers, spindles or mounts. Labels can differ for the same body: FoxAlien calls its DeWalt DWP611 clamp 69 mm,[1] Carbide 3D sells a 69 mm Sweepy 2.0 for the DeWalt trim router,[2] and Sienci lists its 71 mm LongMill mount for the DWP611 and Bosch Colt.[3] Neither maker explains the difference, so the DWP611 appears on both the 69 mm and 71 mm pages. Buy the holder whose maker names your router and machine.
Conversions are exact arithmetic
Inch figures on these pages come from one fact: an inch is exactly 25.4 mm.[4] A conversion tells you the same size in the other unit; it is not a tolerance, and it does not mean a part made for one label fits a body sold under another.
Rings only where a maker documents them
The "Rings and shims" field lists only parts whose maker names both sizes. PwnCNC, for example, sells 69-to-65 and 80-to-65 mm shims among others,[5] designed primarily around its own mounts.[5]
From size to machine
A bore that fits the body is half the match; the back of the mount must fit your Z axis. Use the CNC machine part finder for that, and how to measure a router or spindle body if you have not measured yet.
Next
- 65 vs 69 vs 71 vs 80 mm mounts: which bodies each one holds
- Router and spindle mounts hub
- Dust boots by mount diameter and machine
- 52 mm mounts
- 65 mm mounts
- 69 mm mounts
- 71 mm mounts
- 80 mm mounts
Choose your mount size to see the key facts and what fits. Each fact links to its source on the full page.
All mount sizes
Questions
My measurement falls between two sizes. Which do I pick?
Neither yet. Check the router or spindle maker's stated body size and buy a holder whose maker names that model. The measuring guide shows where to measure.
Why does the DeWalt DWP611 appear under 69 mm and 71 mm?
Because makers label it both ways: FoxAlien and Carbide 3D call their DWP611 parts 69 mm, Sienci lists its 71 mm mount for it. We show both and do not average them.[1][3][2]
Can a ring make an 80 mm mount hold a 65 mm router?
Only a ring or shim whose maker documents it. PwnCNC sells 80-to-65 mm shims and says they were designed primarily around its own mounts.[5]