Best Collet Nut (2026)
Five collet nut sets for rotary tools and CNC mills, from a Dremel quick-change kit to ER11 and ER20 clamping nuts, compared by sizes, materials and pack contents.
On this page
Top picks at a glance
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- 1
Best OverallQWORK ER20 Nut 4 Pack9.6/10View on Amazon - 2
Best for Rotary ToolsDremel 4485 Collet Set9.6/10View on Amazon - 3
Best ValueQWORK ER11 Nut 4 Pack9.6/10View on Amazon - 4
Best PrecisionLuo ke ER20 Collet Set9.5/10View on Amazon - 5
Best Brass OptionLuo ke Brass Collet Set9.5/10View on Amazon
A collet nut is the small, hardworking part that holds the bit: it threads onto the spindle or tool nose and squeezes the collet around the shank. Whether you are swapping bits on a rotary tool for detail work or setting up a CNC mill, the right nut keeps the bit where you put it. This roundup of the best collet nut compares five sets, from a Dremel quick-change kit to ER11 and ER20 clamping nuts, on what each listing states.
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Quick picks
- Best Overall QWORK ER20 Nut 4 Pack: Four M25 ER20 nuts in 40CR steel with black oxide, precision ground and hardened. Check price on Amazon
- Best for Rotary Tools Dremel 4485 Collet Set: A quick-change nut with four collets in 1/32 to 1/8 inch for every Dremel rotary tool. Check price on Amazon
- Best Value QWORK ER11 Nut 4 Pack: Four M14 ER11 nuts in 40CR steel with black oxide, the smaller sibling of the ER20 set. Check price on Amazon
- Best Precision Luo ke ER20 Collet Set: Three 65Mn spring steel collets, 1/8, 1/4 and 1/2 inch, AAA precision under 0.008 mm. Check price on Amazon
- Best Brass Option Luo ke Brass Collet Set: Nine brass pieces in 1, 1.6, 2.4 and 3.2 mm for a long list of Dremel rotary tool models. Check price on Amazon
Machines on the list
QWORK ER20 A Collet Clamping Nuts for CNC Milling
Four M25 ER20 clamping nuts in 40CR steel with a black oxide finish, listed for CNC milling chuck holders and lathes.
Pros
- Four M25 ER20 nuts in one pack
- 40CR steel, black oxide, precision ground and hardened
- Listed for CNC milling chuck holders and lathes
- Stated as a direct replacement for broken nuts
Cons
- No warranty term is stated
- Nut only, no collets included
- M25 thread only fits ER20 holders
- No stated safety or certification information
Dremel 4485 Quick Change Rotary Tool Collet Nut
A five piece quick-change collet nut kit with four collets from 1/32 to 1/8 inch, made for all Dremel rotary tools.
Pros
- Quick-change nut with four collets, 1/32 to 1/8 in
- Made for all Dremel corded and cordless rotary tools
- USA-based customer service by chat, email and phone
- Color-coded brown for the collets category
Cons
- No warranty term is stated
- Dremel tools only, not a generic fit
- Metal material with no stated alloy
- Small parts, easy to misplace
QWORK ER11 A Collet Clamping Nuts for CNC Milling
Four M14 ER11 clamping nuts in 40CR steel with a black oxide finish, listed for CNC milling chuck holders and lathes.
Pros
- Four M14 ER11 nuts in one pack
- 40CR steel, black oxide, precision ground and hardened
- Listed for CNC milling chuck holders and lathes
- Stated as a direct replacement for broken nuts
Cons
- No warranty term is stated
- Nut only, no collets included
- M14 thread only fits ER11 holders
- Same uses list as the ER20 set, copied across
ER20 Spring Collet Nut Set (1/8" & 1/4" & 1/2")
Three 65Mn spring steel collets in 1/8, 1/4 and 1/2 inch with an ER20 clamping nut, at AAA precision under 0.008 mm.
Pros
- Three collets plus the ER20 nut in one set
- 65Mn spring steel, AAA precision under 0.008 mm
- Listed for engraving machines and machining centers
- Collets for 1/8, 1/4 and 1/2 inch shanks
Cons
- No warranty term is stated
- Package count says 2 pcs while the bullets describe 4 pieces
- Table clamping range does not match the collet sizes
- Single nut, so no spare
9 Pcs 4 Sizes Brass Collet Nut Sets
Nine brass pieces in 1, 1.6, 2.4 and 3.2 mm, eight collets plus one nut, listed to fit many Dremel rotary tool models.
Pros
- Nine pieces: eight collets plus one nut
- Four sizes: 1, 1.6, 2.4 and 3.2 mm
- Listed as fitting Dremel rotary tools
- Four-claw clamping design for stability
Cons
- No warranty term is stated
- Bullets say pure copper while the title says brass
- Size list has a typo, 2.4/mm
- Dremel-fit only, not a generic collet
Specs compared
| Model | HQ Score | Type | Sizes | Pieces | Material | Warranty |
|---|---|---|---|---|---|---|
| QWORK ER20 Nut 4 Pack | 9.6/10 | ER20 clamping nut | M25 thread | 4 nuts | 40CR steel, black oxide | Not stated |
| Dremel 4485 Collet Set | 9.6/10 | Quick-change collet nut kit | 1/32 to 1/8 in | 1 nut, 4 collets | Metal | Not stated |
| QWORK ER11 Nut 4 Pack | 9.6/10 | ER11 clamping nut | M14 thread | 4 nuts | 40CR steel, black oxide | Not stated |
| Luo ke ER20 Collet Set | 9.5/10 | ER20 collet and nut set | 1/8, 1/4, 1/2 in | 3 collets, 1 nut | 65Mn spring steel | Not stated |
| Luo ke Brass Collet Set | 9.5/10 | Brass collet and nut set | 1, 1.6, 2.4, 3.2 mm | 8 collets, 1 nut | Brass | Not stated |
Specifications are manufacturer rated, as published on each listing and collected 22 October 2026. Sizes are the collet or thread sizes each listing states.
Buying guide: choosing the best collet nut
ER11 vs ER20
ER11 and ER20 are collet series, and the nut must match the series. The QWORK ER11 nuts use an M14 thread, and the QWORK ER20 nuts use an M25 thread. Pick the nut that matches the collet holder on your machine.
Rotary tool collet kits
Rotary tools like Dremel models use small collets in fractional sizes. The Dremel 4485 kit covers 1/32, 1/16, 3/32 and 1/8 inch with a quick-change nut, and the Luo ke brass set covers 1, 1.6, 2.4 and 3.2 mm. Match the kit to your tool model.
Materials and finish
Both QWORK sets list 40CR steel with a black oxide finish, precision ground and hardened. The Luo ke ER20 set lists 65Mn spring steel with AAA level precision under 0.008 mm. The brass set lists brass collets, though its bullets also say pure copper, a contradiction we note in the review.
Project Match
- CNC milling and lathe work with ER collets: the QWORK ER20 and ER11 four packs, listed for CNC milling chuck holders and lathes.
- Rotary tool detail work on Dremel models: the Dremel 4485 quick-change kit, made for all Dremel rotary tools, or the Luo ke brass set, which the listing says fits a range of Dremel rotary tool models.
- Engraving machines and machining centers: the Luo ke ER20 collet and nut set, listed for engraving machines, milling machines and machining centers.
How the scores add up
Each set is scored on performance, build, value, safety and warranty, with the weights published on our How We Pick page. A spec the listing does not publish scores nothing.
| Product | HQ Score | Perf. /35 | Build /25 | Value /25 | Safety /10 | Warranty /5 |
|---|---|---|---|---|---|---|
| QWORK ER20 Nut 4 Pack | 9.6 | 30 | 21 | 20 | n/a | 0 |
| Dremel 4485 Collet Set | 9.6 | 29 | 21 | 20 | n/a | 0 |
| QWORK ER11 Nut 4 Pack | 9.6 | 29 | 21 | 20 | n/a | 0 |
| Luo ke ER20 Collet Set | 9.5 | 28 | 19 | 20 | n/a | 0 |
| Luo ke Brass Collet Set | 9.5 | 27 | 18 | 21 | n/a | 0 |
Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score. Safety counts only for powered gear or where the listing states safety features; where it does not apply, the score is taken over the remaining 90 points.
FAQ: lasers and CNC
What is a collet nut?
It is the threaded nut that clamps a collet around a bit shank. Tightening the nut squeezes the collet, which grips the bit in the spindle or tool nose. Every set here includes the nut, and some include the collets too.
What is a collet nut kit?
A kit pairs the nut with collets in several sizes. The Dremel 4485 is a five piece kit with four collets and one quick-change nut, and the Luo ke brass set is nine pieces with eight collets and one nut.
How do you remove a collet from the nut?
The listings do not describe removal steps. The Dremel kit’s quick-change nut is made for fast collet swaps on Dremel rotary tools; for anything else, follow the tool maker’s manual rather than improvising.
What is a collet nut on a router?
On a router or rotary tool, the collet nut threads onto the tool nose and holds the collet that grips the bit. The Luo ke ER20 set lists 1/8, 1/4 and 1/2 inch collets with its ER20 nut, the sizes a router or mill spindle commonly uses.
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