Best Long 1/8 Inch Cnc Router Bits (2026)

Specs compared

Specifications are manufacturer rated, as published on each listing and collected 23 October 2026. Cutting diameter follows the title and bullets where a spec table differs.

What the listings tell you, and what they leave out

The listings agree on the basics, a 1/8 inch cutting diameter across the picks, and differ on shank, length and flute shape. The contradictions matter more than the agreements: the EANOSIC spec table gives a 0.25 inches cutting diameter against a 1/8 inch title, the MAIHOMETA title and bullets disagree on pack count and on cut direction, and the HQMaster bullets and spec table give the cutting diameter in differing forms, 3.175mm and 3.18 millimeters. Where a title and a spec table differ, this guide follows the title and bullets.

No listing in this guide states a warranty term, and no listing states a safety certification or rating, so every pick scores nothing for warranty and safety. The SpeTool picks state only what their titles give, so their cutting length, pack count and coating details beyond the title are not stated. That thin listing data is why the SpeTool picks sit below the full-data picks, even though their titles name long reach and a downcut shape.

Buying guide: choosing the best long 1/8 inch cnc router bits

Shank and collet fit

Shank size decides whether a bit fits the holder at all. The picks here use a 1/8 inch shank or a 1/4 inch shank, and the listings that name a collet size name a 1/4 inch collet. Match the shank to the holder before ordering.

Cutting length and overall reach

Cutting length sets how deep a pass can shape, while overall length sets how far the bit can reach past the holder. The HQMaster cutting length is 25 millimeters with a 50mm overall length, the EANOSIC cutting length is 1 inch with a 3 inch overall length, and the MAIHOMETA cutting length is 1-1/4 inch with a 2-1/2 inch overall length. The MAIHOMETA listing advises choosing a cutting length that exceeds the board by 2-5mm, or the end mill may break.

Flutes and chip removal

Upcut spirals lift chips out of the cut, which the listings link to smooth cutting edges and fast chip-removal. The HQMaster and EANOSIC listings use 2 flutes, while the MAIHOMETA listing uses 3 flutes and links the shape to better chip evacuation and less heat buildup. The downcut pick is named for slot cutting work, while the upcut picks name groove, slot, mortise, cycle and dado work.

Coatings and edge life

Coatings appear in the full-data listings under Nano Blue, NACO and Blue Nano names, with maker claims of heat resistance, wear resistance and edge sharpness, and a MAIHOMETA claim of up to 2.5X tool lifespan compared with uncoated bits. Treat those claims as maker claims, not measured figures.

Materials, dust and ventilation

Materials named across the listings include wood, plywood, hardwood, MDF, acrylic, nylon, resin, plastics, density board, carbon steel, soft alloy steel, tool steel, cast iron and aluminum alloy. Match the bit to a material the listing actually names, and vent dust from plastics and composites.

Project Match

• Carved parts and relief work: the HQMaster set, for carving, cutting, engraving, milling, slotting and sculpturing in wood, MDF and hardwood.
• Grooves, slots, mortises and dados: the MAIHOMETA and EANOSIC picks, per their listings.
• Long reach carving and engraving: the EANOSIC and SpeTool extra long picks, with a 3 inch overall length.
• Slot cutting: the SpeTool downcut pick, per its title.

How the scores add up

Each bit is scored on performance, build, value, safety and warranty, with the weights published on the How We Pick page. A spec the listing does not publish scores nothing, and a warranty term scores only when the listing states a concrete term.

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

How should cnc bits be cleaned?

No listing in this guide states a cleaning method. Clear chips from the flutes after use, keep the bits in the storage case where a case is supplied, and follow the maker guidance for the bit.

What shank size fits a 1/4 inch collet?

The listings that name a collet size name a 1/4 inch collet, and the bits with a 1/4 inch shank match that collet size. The HQMaster bit uses a 1/8 inch shank, so it needs a holder made for a 1/8 inch shank.

Can these bits cut hardwood?

Hardwood is named in the HQMaster, EANOSIC and MAIHOMETA listings, along with plywood, OAK and MDF. Match the bit to the material named in its listing, and choose a cutting length that suits the board.

What is the difference between upcut and downcut bits?

Upcut bits in this guide are linked in their listings to chip removal and smooth cutting edges, while the downcut pick is named in its title for slot cutting work. The listings do not publish a side-by-side comparison of edge finish, so choose by the work named in the listing.

Related: the cnc tooling hub, best 1/8 downcut cnc bit, best cnc router bits, best cnc bit set for beginners and best dado bit for cnc.