Best Spiral Upcut Router Bit Under $40 (2026)

Specs compared

Specifications are manufacturer rated, as published on each listing and collected 22 October 2026. None of the five listings states a warranty term.

What the router bit listings tell you

Five spiral upcut router bit listings were read for this guide, and the spec tables deserve a close look. The Whiteside RU4700 bullets state a 1/2 in shank for a 1/2 in collet while its spec table lists a 0.25 in item diameter; the title and bullets win. Coating claims vary: the EANOSIC extra-long bit states an nACo coating for hardness and heat resistance, and the SpeTool and the EANOSIC flush trim bit each claim about 2.5 times the life of an uncoated bit, as the maker’s claim. One listing is a flush trim bit with a top bearing rather than a general mortising bit, so match the bit to the job. Read the spec table, not just the title.

Buying guide: the best spiral upcut router bit under 40

Cutting diameter and shank size

Cutting diameter decides the width of the slot: the SpeTool and the Whiteside RU1600 cut a 1/8 in diameter for fine grooves and detail work, while the EANOSIC extra-long, the EANOSIC flush trim and the Whiteside RU4700 cut a 1/4 in diameter for general joinery. Shank size must match the collet: four bits here have 1/4 in shanks for 1/4 in collets, and only the Whiteside RU4700 has a 1/2 in shank for a 1/2 in collet. A 1/2 in shank runs with less flex on a bigger router, but it needs the bigger collet. This 1/4 vs 1/2 shank router bits guide explains the trade-off.

Upcut action, coating and flute count

An upcut spiral pulls chips upward out of the cut, which keeps deep slots clear and leaves a clean edge on the side of the material farthest from the router, per the Whiteside listings. Coatings are the main upgrade on these bits: the EANOSIC extra-long states a blue nano nACo coating for hardness and heat resistance, the EANOSIC flush trim states a nano blue coating, and the SpeTool states a coating claimed to give up to 2.5 times the life of an uncoated bit, all as the maker’s claims. The two Whitesides state no coating. Four bits have 2 flutes; the flush trim bit has 1. This upcut vs downcut router bit guide covers when to choose each spiral direction.

Match the bit to the material

All five list wood: hardwoods, softwoods, plywood, MDF and oak appear across the listings, with laminate and hard plastics named on two. The EANOSIC extra-long goes further and lists carbon steel, soft alloy steel, tool steel, cast iron and aluminum alloy, as the maker’s claim; treat metal work as the listing’s claim and confirm feeds before cutting metal. For plastics, the Whiteside bits name hard plastics; never cut PVC or vinyl with a router bit, since the fumes are hazardous. This CNC router bit types guide maps profiles, spirals and flutes to jobs.

Cutting length and overall length

Cutting length sets how deep one pass can go: the Whiteside RU1600 states 1/2 in, the SpeTool, the EANOSIC flush trim and the Whiteside RU4700 state 1 in, and the EANOSIC extra-long states 2 in. Overall length sets reach and clearance: 2 in on the RU1600, 3 in on the SpeTool, 3-1/4 in on the RU4700 and 4 in on the EANOSIC extra-long. Longer bits reach deeper mortises but flex more, so take lighter passes with the 4 in bit and let the upcut helix clear the chips. If the cut is deeper than the stated cutting length, plan multiple passes rather than forcing the bit. For general joinery, the best spiral upcut router bit guide compares bits without the under $40 price cap.

Project Match

How the scores add up

Each bit is scored on performance, build, value, safety and warranty, with the weights published on our How We Pick page. For router bits, safety points come from named safety-relevant features or certifications on the listing; none of the five listings names any, so all five score zero on safety. None of the five states a warranty term, so all five score zero on warranty as well.

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 spiral upcut router bit good for?

Grooves, dados, slots, pockets and mortises. The upcut spiral pulls chips out of the cut and leaves a clean edge on the side of the material farthest from the router, per the Whiteside listings, and all five bits here are plunge-capable or suit plunge routers.

What is the difference between upcut and downcut bits?

An upcut spiral moves chips upward and clears deep cuts, with the clean edge on the far side; a downcut pushes chips down for a cleaner top edge. The buying guide above links the full comparison.

Can these bits cut metal?

Only the EANOSIC extra-long lists metals: carbon steel, soft alloy steel, tool steel, cast iron and aluminum alloy, as the maker’s claim. The other four list woods, and the Whitesides add hard plastics. Confirm feeds and speeds before cutting metal.

Do I need a 1/4 in or a 1/2 in shank?

Match the collet. Four bits here have 1/4 in shanks for 1/4 in collets; only the Whiteside RU4700 has a 1/2 in shank, and it needs a router with a 1/2 in collet.

What does the coating do on these bits?

The listings state hardness, heat resistance and longer edge life. The SpeTool claims up to 2.5 times the life of an uncoated bit, and the EANOSIC flush trim claims up to 2.5X longer life, both as the maker’s claims. The two Whiteside bits state no coating.

Related: best spiral upcut router bit, upcut vs downcut router bit, CNC router bit types, solid carbide vs carbide tipped router bits, the CNC tooling hub.