Best 1/8 Downcut CNC Bit Under $40 (2026): 5 Picks Compared
5 1/8-inch downcut CNC bits under $40 compared for inlay, mortising and engraving, with shank sizes, cutting lengths, flutes and coatings from the listings.
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Top picks at a glance
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- 1
Best OverallSHARPRO Coated 1/8 Bit9.6/10View on Amazon - 2
Best for InlayTEMO 1/8 Downcut Bit9.6/10View on Amazon - 3
Best 1/4 ShankSHARPRO 1/4 Shank Bit9.6/10View on Amazon - 4
Best for Mixed MaterialsEANOSIC Downcut Bit9.6/10View on Amazon - 5
SpeTool 1/8 Inch Spiral Downcut Router Bit 1/4 Inch ShankView on Amazon - 6
1/4 Inch Downcut Spiral CNC Router Bit for WoodView on Amazon - 7
CNC Spoilboard Surfacing Router Bit 1/4 Inch ShankView on Amazon - 8
CNC Spoilboard Surfacing Router BitView on Amazon - 9
Whiteside 6210 CNC Spoilboard Surfacing Router BitView on Amazon
A sign maker cutting small letters, a luthier fitting inlay, or a woodworker chopping mortises all run into the same problem: the top edge of the cut tears out. A downcut spiral pushes chips down into the cut instead of lifting them, which leaves the top surface clean. This guide to the best 1/8 downcut cnc bit under 40 compares 5 1/8-inch downcut bits on the details that decide cut quality: shank size, cutting length, flute count, coating and what each listing says the bit can cut.
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Quick picks
- Best Overall SHARPRO Coated 1/8 Bit: Downcut 1/8 bit with coating, serial-tracked QC and 22 mm of cutting length. Check price on Amazon
- Best for Inlay TEMO 1/8 Downcut Bit: 1.5 in cutting length and US-based customer service for inlay work. Check price on Amazon
- Best 1/4 Shank SHARPRO 1/4 Shank Bit: 1/4 in shank, 140-degree end angle and a protective case. Check price on Amazon
- Best for Mixed Materials EANOSIC Downcut Bit: Nano Blue coating; the listing names steel, cast iron and aluminum alloy. Check price on Amazon
Machines on the list
1/8 Downcut Router Bit 1/8 Shank
Who it's for: a maker doing small detailed engraving and mortising who wants a coated 1/8-inch downcut bit. Who should skip it: anyone whose spindle only takes a 1/4-inch collet.
Pros
- Smooth Quark coating with a serial code the maker uses for quality tracking.
- 2 flutes and a 22 millimeter cutting length for detailed downcut work.
- Listing names woodcraft, engraving, mortising, acrylic and aluminum.
- Protective plastic case with compression holder and rubber cap included.
Cons
- 1/8-inch shank needs a 1/8-inch collet, not the common 1/4-inch.
- The size name says 6/7 inch cutting length while the spec table says 22 millimeters.
- No warranty term is stated on the listing.
- No safety feature is named on the listing.
1/8 Router Bits 1/4 Shank
Who it's for: a woodworker mortising and grooving in hardwood with a 1/4-inch collet. Who should skip it: anyone who needs a coated bit or a 1/8-inch shank.
Pros
- 1/4-inch shank suits the common 1/4-inch collet and resists flex.
- 140-degree end cutting edge angle stated for chip evacuation.
- Surface roughness below Ra 0.8μm stated for a cleaner cut.
- Protective plastic case with compression holder and rubber cap included.
Cons
- Only 1 flute listed in the spec table, against 2 on most rivals here.
- No coating is stated, unlike the coated SHARPRO and EANOSIC bits.
- The spec table calls the cut type Groove cut while the title says downcut.
- No warranty term is stated on the listing.
TEMO 1/8" Carbide Downcut Inlay Router Bit CNC End
Who it's for: a maker doing inlay, guitar work or deep slot mortises who wants the longest cutting length here. Who should skip it: anyone who needs a 1/4-inch shank or a coated edge.
Pros
- 1.5-inch cutting length, the longest of the 5, for deep inlay pockets.
- Inlay, slot mortise, engraving and guitar work named in the listing.
- Works on hardwoods, softwoods and acrylic according to the listing.
- US-based customer service by chat, email, phone or in La Crosse, WI.
Cons
- 1/8-inch shank needs a 1/8-inch collet, not the common 1/4-inch.
- No coating is stated, unlike the coated SHARPRO and EANOSIC bits.
- The 1.5-inch figure is the spec table's cutting length, worth confirming.
- No warranty term is stated on the listing.
EANOSIC Spiral CNC Router Bit 1/8 inch Cutting Dia
Who it's for: a maker cutting mixed materials including aluminum and steel who owns a 1/4-inch collet. Who should skip it: anyone bothered by a listing that contradicts itself.
Pros
- Nano Blue (nACo) coating stated for hardness and heat resistance.
- 1/4-inch shank with 2-inch total length for reach and stiffness.
- Listing names aluminum alloy, carbon steel, tool steel and cast iron.
- Also lists plywood, oak, MDF and hardwood for woodwork.
Cons
- Bullets call it an up-cut bit in places though the title says downcut.
- Spec table says cutting diameter 0.25 inches against the 1/8-inch title.
- Only 1/2-inch cutting length, the same as the SHARPRO 1/4 Shank Bit.
- No warranty term is stated on the listing.
CNC Router Bit 3 Flutes 1/8 inch Cutting Dia 1/4
Who it's for: a maker who actually wants an upcut bit for chip evacuation in wood. Who should skip it: anyone shopping this downcut keyword, since it is not a downcut bit.
Pros
- NACO (Nano Blue) coating stated for hardness and heat resistance.
- 3 flutes with 1-1/4-inch cutting length and 2-1/2-inch overall length.
- 1/4-inch shank suits the common 1/4-inch collet.
- Item weight of 0.02 kg stated, the only weight stated here.
Cons
- Spec table cut type is Up-Cut, so it does not match the downcut keyword.
- Scored lowest here because performance is judged on the downcut task.
- Only wood materials named: plywood, oak, MDF and hardwood.
- No warranty term is stated on the listing.
Other machines to compare
SpeTool 1/8 Inch Spiral Downcut Router Bit 1/4 Inch ShankCheck price on Amazon
1/4 Inch Downcut Spiral CNC Router Bit for WoodCheck price on Amazon
CNC Spoilboard Surfacing Router Bit 1/4 Inch ShankCheck price on Amazon
CNC Spoilboard Surfacing Router BitCheck price on Amazon
Whiteside 6210 CNC Spoilboard Surfacing Router BitCheck price on Amazon
Specs compared
| Bit | HQ Score | Shank | Cutting length | Flutes | Coating |
|---|---|---|---|---|---|
| SHARPRO Coated 1/8 Bit | 9.6/10 | 1/8 in | 22 millimeters | 2 | Smooth Quark |
| SHARPRO 1/4 Shank Bit | 9.6/10 | 1/4 in | 1/2 in | 1 | Not stated |
| TEMO 1/8 Downcut Bit | 9.6/10 | 1/8 in | 1.5 in | 2 | Not stated |
| EANOSIC Downcut Bit | 9.6/10 | 1/4 in | 1/2 in | 2 | Nano Blue (nACo) |
| YOKISHUN 1/8 Upcut Bit | 9.3/10 | 1/4 in | 1-1/4 in | 3 | NACO (Nano Blue) |
Specifications are manufacturer rated, as published on each listing and collected 24 October 2026.
Buying guide: the best 1/8 downcut cnc bit under 40
Downcut vs upcut
A downcut spiral pushes chips downward, which keeps the top face of the workpiece clean when you groove, dado or inlay. An upcut spiral pulls chips up and out of the cut. 4 of the 5 bits here are listed as downcut; the YOKISHUN spec table lists its cut type as Up-Cut, so read its card as the odd one out. If you cut mostly sheet goods and care about the visible face, a downcut is the usual choice; see best compression router bit for a bit that cuts clean on both faces.
Shank size and collets
The shank has to match your collet. The TEMO and the coated SHARPRO bits use a 1/8-inch shank, while the EANOSIC, the 1/4-inch SHARPRO and the YOKISHUN use a 1/4-inch shank; the EANOSIC listing pairs its bit with a 1/4-inch collet. A 1/4-inch shank is the stiffer option and suits routers that already carry a 1/4-inch collet, while a 1/8-inch shank fits compact spindles. Decide by the collets you own, not the bit you want.
Cutting length and flutes
Cutting lengths here run from 1/2 inch to 1.5 inches, with the coated SHARPRO listing 22 millimeters. The TEMO’s 1.5-inch cutting length stands out for deep inlay pockets and guitar work, while the 1/2-inch bits suit shallow grooves and engraving. Flute counts are 1, 2 or 3: the single-flute SHARPRO lists a 140-degree end cutting edge angle for chip evacuation, and the YOKISHUN runs 3 flutes. For the difference flute count makes, see single flute vs two flute end mill.
Coatings
2 listings name a coating and 3 do not. The EANOSIC carries a Nano Blue (nACo) coating that the maker says keeps the edge hard and heat resistant, and the YOKISHUN carries a NACO (Nano Blue) coating with the same stated purpose. The coated SHARPRO lists a Smooth Quark coating and a serial code the maker uses for quality tracking. An uncoated solid carbide edge still cuts well in wood; treat coating as a bonus for longer edge life rather than a requirement. See coated vs uncoated carbide end mills for the trade-offs.
Materials
All 5 listings name wood: hardwood, softwood, plywood and MDF appear across the set, with laminate named by SHARPRO and acrylic named by TEMO and the coated SHARPRO. The EANOSIC listing goes further and names aluminum alloy, carbon steel, soft alloy steel, tool steel and cast iron. Match the bit to the material you actually cut; a bit listed for wood only should stay on wood. Never cut PVC or vinyl on any machine, laser or CNC.
Wear eye and hearing protection, run dust collection (wood and MDF dust are hazardous to breathe), clamp or screw the workpiece down, and keep hands clear of a moving bit. Stay with the machine while it cuts. Small-diameter bits snap if you plunge too deep or feed too fast, so start shallow.
Project Match
- Inlay and guitar work: TEMO 1/8 Downcut Bit, with its 1.5-inch cutting length and inlay in the listing title.
- Small detailed engraving: SHARPRO Coated 1/8 Bit, with the Smooth Quark coating and serial-tracked quality.
- Mortising and grooving in hardwood: SHARPRO 1/4 Shank Bit, with the 140-degree end cutting edge angle.
- Mixed wood and metal: EANOSIC Downcut Bit, the only listing that names steel and cast iron.
- Not a downcut: the YOKISHUN bit is listed as Up-Cut, so it does not match this keyword.
How the scores add up
The HQ Score weighs performance for the downcut task, build quality, value, safety and warranty, with performance, build and value carrying most of the weight, as published on our How We Pick page. None of the 5 listings names a safety feature or a warranty term, so no points were awarded in those columns.
| Product | HQ Score | Perf. /35 | Build /25 | Value /25 | Safety /10 | Warranty /5 |
|---|---|---|---|---|---|---|
| SHARPRO Coated 1/8 Bit | 9.6 | 29 | 21 | 21 | n/a | 0 |
| SHARPRO 1/4 Shank Bit | 9.6 | 28 | 21 | 21 | n/a | 0 |
| TEMO 1/8 Downcut Bit | 9.6 | 29 | 20 | 20 | n/a | 0 |
| EANOSIC Downcut Bit | 9.6 | 27 | 21 | 20 | n/a | 0 |
| YOKISHUN 1/8 Upcut Bit | 9.3 | 16 | 20 | 19 | 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 downcut bit good for?
Grooves, dados, mortises and inlay where the top surface has to stay clean. The spiral pushes chips down into the cut instead of lifting them, so the visible face does not tear out.
Can I use a 1/8-inch bit in a 1/4-inch collet?
No. The shank must match the collet: the TEMO and coated SHARPRO bits need a 1/8-inch collet, and the EANOSIC, 1/4-inch SHARPRO and YOKISHUN bits need a 1/4-inch collet, as the EANOSIC listing states.
What is the difference between the SHARPRO bits?
The 1/4 Shank Bit uses a 1/4-inch shank, 1/2-inch cutting length and 1 flute with no coating stated. The Coated 1/8 Bit uses a 1/8-inch shank, 22 millimeters of cutting length, 2 flutes and a Smooth Quark coating.
Is the YOKISHUN bit a downcut bit?
No. Its spec table lists the cut type as Up-Cut, even though the keyword asks for downcut. It scored lowest here because the performance score is judged against the downcut task.
What materials can these bits cut?
Hardwood, softwood, plywood and MDF across the set, plus acrylic on the TEMO and coated SHARPRO listings and aluminum alloy on the coated SHARPRO and EANOSIC listings. The EANOSIC listing also names carbon steel, soft alloy steel, tool steel and cast iron.
Related
Related: best 1/8 downcut CNC bit, best CNC router for sign making, best CNC bit set for engraving, the CNC tooling hub and the best CNC router for sign making. Also see our CNC feeds and speeds for beginners. Also see our best wood for CNC signs. Also see our CNC router projects for beginners. Also see our end mill vs router bit.
