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1/4 in. x 1 in. Carbide Up Spiral Router Bit

  • Use in CNC, hand-held or table-mounted routers
  • Cuts all composition materials, plywood, hardwood & softwood
  • TiCo Hi-Density Carbide for flawless finishes and longer life
  • See More Details

Frequently Bought Together


Product Overview

A kickback-reducing design and high-grade composition make this Diablo 1/4 in. x 1 in. Carbide Up Spiral Router Bit one smooth-operating accessory. Suitable for use on wood and manmade material, this durable carbide bit produces safe, precise cuts and features tri-metal brazing to reduce vibrations and impacts.
  • Delivers a precise, safe cut in both wood and manmade material
  • High-density carbide body with titanium construction offers a long cutting life
  • 1/4 in. Cut diameter with 1 in. maximum depth produces consistent swaths
  • Kickback-reducing design allows steady operation
  • Requires a minimum chuck size of 1/4 in.



Cut Diameter
Product Depth (in.)
Product Height (in.)
Product Length (in.)
Product Width (in.)
.8 in
Shank Diameter (in.)


Bit Material
Number of Flutes
Number of Pieces
Router/planer type
Shank Style
Tools Product Type
Power Tool

Questions & Answers


How do yiu cut mortise and dado and grove with this bit

Asked by Steve January 17, 2021

On a CNC Mill with a max rpm of 10,000 What would be a good feedrate and depth for poplar and oak...

Asked by Brack November 18, 2020

About 8000 rpm and never run a depth of more than half the diameter..That being said I usually run a roughing of about 1/16 to 1/8 inch per pass...You can also google feed and speed rate charts...But a lot will depend on your router.

Can this be used on a CNC machine to cut aluminum sheets?

Asked by wslymsgrv May 10, 2019

It could be used in a wood cutting CNC machine for sure. I would use an endmill in my Bridgeport Mill for metal cutting. No doubt it would cut aluminum sheets, but this shape of bit wuold have a tendency to catch or snag thin sheets. I would use a different shape/style bit with a rounded nose. Also, an "up Spiral" will tend to lift the metal sheet, increasing the possibility of snagging. A piece of sheet metal caught on a rotating machine is a very dangerous thing. If you have no other choice, use clamps and heavy gloves.

Can I cut laminate counter top

Asked by Asif August 26, 2018


anyone know if this is a good bit to cut plastic with??

Asked by glenn July 13, 2018

Yes, use light cuts, plastic tens to melt.

Isn't the picture of this bit incorrect? An up-spiral bit should wind toward the tip on the righ...

Asked by Jumbliah April 19, 2018

An up spiral indicates the waste is pulled toward the router. If you were using the bit in a hand held router the waste would go up ward. If you were using the bit in a router table the waste would go downward toward the router.

What exactly is the purpose of this bit?

Asked by SB March 1, 2018

The 'up-spiral' or perhaps it could be called an 'out-spiral' bit, produces a smooth cut which lifts and removes debris out from the channel being cut, instead of leaving it full of shavings, with all the advantages others have mentioned. HOWEVER, such a spiral bit has the SLIGHT disadvantage of occasionally causing some break-out (chipping) of the edge of a channel because the cutting force is at an angle. For this reason, you would not use this bit (and should seek out a 'DOWN-spiral bit) if the definition of the edge of the channel is important, such as when routing a detailed pattern or letters/name. You will usually see down-spiral bits in small diameters where the need to avoid tear-out is most important. For most work, I find up-spiral bits preferable to straight bits, and worth the slight extra cost.

Is this bit available in 1/2 inch width?

Asked by Norm August 15, 2017

Yes, it is.

Can this be used to cut aluminum moving horizontal?

Asked by Sal July 27, 2017

I wouldn't use it that way.

can this be used in a CNC router

Asked by Lenny May 12, 2017

It would work well in that application

1/4 in. x 1 in. Carbide Up Spiral Router Bit - page 2

Customer Reviews

  • 4.1
    out of 150 reviews
  • 81% recommend this product
Filter by:
Showing 1-10 of 150 reviews
Worked good. Used in in my router in a circle cutting jig.
Worked good. Used in in my router in a circle cutting jig.
by sparky
doing 1/4" pass on pine bit snapped.. wasted 20$
bought Diablo for quality, could have bought Riobi same junk
by disappointed
1 person found this helpful
I'm going to go ahead and assume my bit was an outlier in terms of quality. During the bit's fir...
I'm going to go ahead and assume my bit was an outlier in terms of quality. During the bit's first use, while attempting a 1/4" lap in hickory, the bit literally snapped off. I bought this to replace a Ryobi bit, especially with all the reviews stating that there was no burning of the wood using this bit. Feel like I wasted $20.
by EWCChris
4 people found this helpful
Excellent for cutting circle out
I used this with my Ryobi fixed base router in a rudimentary circle jig. I cut a 21" hole out of a table I built for my Big Green Egg. Smooth, non-burnt edges in the finished cut on the 1x6 slats. Such a nice finish I'll be usig the circle cut out for a homemade wall clock. Very happy with this bit!
by MattW
1 person found this helpful
1/4 in. x 1 in. Carbide up spiral router bit
This bit has cut over 30' in cherry wood so far and has performed without burning and left a smooth finish. The bit is easy to guide and does not chatter.
by BSK
1 person found this helpful
I do a lot of detail work and this thing cuts beautifully, easy to control, clean cut and doesn't seem to stop cutting perfectly. I love this product and all of the diablo cutting tools.
by jaybird
2 people found this helpful
Would not cut very well burns the wood as it cuts
Would not cut very well burns the wood as it cuts
by Mad
Response from DiabloProductExpertJun 11, 2021
Thank you very much for taking time to share such thoughtful commentary. Our team is here to help. Please give us a call and we’ll do our best to make this right: 800-334-4107. You can also email us if that’s preferred at customerservice@diablotools.com. We look forward to speaking with you!
Rating provided by a verified purchaser...
Rating provided by a verified purchaser
by HomeDepotCustomer
It broke in half 30 seconds into the cut.
It broke in half 30 seconds into the cut.
by Router
Response from DiabloProductExpertMay 11, 2021
Thank you very much for the thoughtful feedback! We'd love an opportunity to help with this. Please contact us and we'll get started right away: call 800-334-4107 or email customerservice@diablotools.com. We look forward to speaking with you!
Worked well until it broke!...
Worked well until it broke!
by escyr
Response from DiabloProductExpertMay 3, 2021
Thank you for the thoughtful input. Please know that we take our customers’ feedback seriously and will be sharing this with the team for review. In the meantime, we’d love to further discuss your experience. When you have a moment, give us a call at 800-334-4107 or email customerservice@diablotools.com.
Showing 1-10 of 150 reviews