Angled view of a surfacing router bit with gold-colored cutting inserts.
SpeTool insert surfacing bit and insert dimension diagram beside a routed wood sample
SpeTool W05004 ATS spoilboard surfacing router bit, 1-1/4-inch diameter (product image)
SpeTool insert surfacing bit beside wood boards and examples of wood-based materials
SpeTool W05004 ATS spoilboard surfacing router bit, 1-1/4-inch diameter (product image)

SpeTool W05004 ATS Coated Insert Mini Surfacing & Rabbeting Flycutter 2+2 Flute Design 1-1/4" Diameter x 1/4" Shank Router Bit

SKU: IP2FS-1-1/4-D1/4-4T-ATS
Sale price$51.99 USD

Shipping calculated at checkout


Spoilboard Surfacing Router Bits are built for fast, smooth, and precise flattening of CNC spoilboards, slabs, and large wood surfaces. With ultra-sharp carbide inserts and a durable body, they deliver clean cuts, extend tool life, and reduce sanding—perfect for keeping your CNC bed true and ready for accurate machining.

Excellent For Cutting:

  • MDF
  • Chipboard
  • Hardwood
  • Plastic
  • Plywood
  • Fiberboard
  • Softwood
  • Acrylic

TOOL SPECS: ¼" shank, 1-¼" (31.75 mm) cutting diameter, 2+2 flute design with 10×10×2.2 mm four-edge carbide inserts for precise surfacing.

FAST & EFFICIENT: Dual main cutters quickly remove material, while twin up-shear scorers smooth the surface in fewer passes.

LONG-LASTING VALUE: ATS-coated carbide inserts provide up to 2× tool life—rotate or replace inserts, not the whole bit.

239 in stock
Quantity:
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Smooth starts with the right bit.

Frequently Asked Questions

Designed for leveling and cleaning the sacrificial spoilboard on CNC tables or router sleds. Wide diameter and multiple flutes ensure efficient flattening.

A ½" shank offers greater rigidity and less vibration compared to thinner shanks.

Replaceable insert bits (like Amana's with 4-sided knives) offer better longevity—cheaper over time versus replacing entire bits.

Absolutely—surfacing bits perform flat surfacing much faster than small end mills, significantly reducing runtimes.

Yes—but may still require sanding afterward for full smoothness.

Community reports describe dust clouds on “cosmic scales”—strong dust collection is essential.

Routers with 2¼ HP+, ½" collet, variable speed, and soft start are preferred. Examples: Porter-Cable 890, Bosch 1617 EVS.

Some recommend raising spoilboard height or using a shorter sled to compensate.

Yes—take shallow passes, reduce RPM, and keep bit moving to avoid burning.

Use appropriate feed/fine passes and larger diameter bits; users reported no ridges on 5×8’ table using 2.5" bit.

  • 5 stars: 21 (78%)
  • 4 stars: 6 (22%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
A
Alejandro L.
Excellent Surfacing Bit

Right out of the box it cuts perfectly and leaves a fantastic finish. Make sure to periodically turn the carbide inserts for a longer lasting bit.

J
Johnny
1-¼ Surfacing and Rabbeting flycutter

This tool cuts great in walnut and maple stock. No burning and is very fast. It leaves a very smooth surface.

G
Gary
This is a nice tool

For slab or wasteboard flattening on Cnc. Have been happy with the finish I’ve been getting.

T
Terese Schroeder
It does cut good other than ripping the wood.

The flat bit rips the wood somewhat.

R
Rotten Guatemalan
Works well on wood. Not so well on rocks.

Works fine. Leaves a reasonably smooth milled finish, easy to sand to finished smoothness. Cutters last well and new faces align perfectly, leaving the same reasonably smooth milled finish.

Don't run into that rock that the tree incorporated into its trunk. Wish Amazon sold a rock detector. But the replacement bit worked just as well as the first one. This was a good purchase.

j
jeff Baucher
Sharp fine cut

Nice price

p
pk
Awesome flattening bit!

Ive only been woodworking for about a year now. I made my first epoxy table and made my own router sled to flatten. The biggest bit I had at the time was 3/4". It worked well but knew if I was going to do it again I needed to upgrade my bit. I have a Bosch 1617 router so I didn't want to go too big. I've used this bit to flatten epoxy tables, walnut and cherry slabs, end grain cutting boards and more. It cuts smooth, leaves a great finish with no tear out or anything and stays sharp. I havn't needed to rotate or replace the blades yet. It works so well I've been considering trying the 2" version. Worth every penny!

J
Jim B
Great Value in a Surfacing Bit

I purchased a flattening jig for cutting boards that I am making and needed a flattening bit. Got a much more expensive bit when I purchased the jig and also purchased this SpeTool bit because I new it would be available the next day when I needed it. The SpeTool bit outperformed the much more expensive bit and left a very smooth surface when surfacing endgrain hardwoods. Highly recommended.

N
Nate
Works good

Works as it should, no complaints

A
Al K.
Excellent surfacing bit

Very smooth cut at 120 ipm. No burn marks and no sanding required.

J
Jayne Roberson
Awesome product

I was hesitating to purchase this bit. I'm glad I did. So easy to smooth a surface, I needed to cut only a 1/4 inch out of the top of a circle, did a great job.

D
Dana W.
Great bit for plank flattening

I am new to a router sled and didn't know what type of bit to purchase. I purchased two. The first one went dull almost immediately. This bit is wonderful. It is smaller than the first bit I tried but it cut through my walnut plank very well. I like that the individual cutting heads can be turned when they dull to keep your bit sharp. I have not had to turn them yet but feel I will need to when I finish my 8 foot plank.

A
Amazon Customer
Works great

Good bit works great love that I have multiple uses from one blade

E
E. Petersdorf
Worked great!

Did exactly what I expected and left a clean surface behind

T
Thomas Dahl
High quality router bit

High quality router bit

H
Hannah
Clean end grain cut

I bought it to trim end grain using a trim router. Left a nice surface. Only used once thus far, so I cannot comment on durability. Thus far, I’m happy with the cut and the price, with the former being more important than the latter.

p
pixelmechanic
Creates a nice flat working surface

Used this for planing a CNC bed. Worked great.

D
Dara G.
Gets a decent finish

One blade sits lower. Finish is clean if you feed it slow. Could've had a better price.

T
Todd Family
Great Finish

At least for the woodworking that I do, I could not ask for better. The blades are super sharp and durable, they can be rotated, which provides for longevity, this thing hogs off material and most importantly it leaves a great finish.

Depending on what Im making, I have even skipped sanding afterwards.

T
Tim
Gets the job done.

A good budget bit that gets the job done. Works best taking light passes at slower pace.

R
Roadking
Super clean cut

Used to surface the spoil board on my CNC. Cut quickly and smoothly, leaving a nice clean, flat surface.

D
Douglas Navarro Guevara
parece ser la broca ideal para el trabajo deseado

Creo que me será muy útil.

C
Claude
Works great

I made a sled for my hand held router and this flattening bit worked great. Smoothed and leveled both sides of a 36” diameter table top easily and fast.

J
Joseph L.
Brillant.

It was giving me clean cuts to level a table. It is super sharp though, slipped while attaching and had to tape up a slight wound! Classic user error.

Z
Zack Hryndej
Far superior to any others I’ve tried

All the other bits I’ve tried resulted in burning and uneven passes, but this bit is sharp and leaves a perfect finish

T
Troy Bisgard
Monster

This thing is a beast! Remarkably better than any surfacing bit I've ever had. Thank you

J
Johan
Aggressive work finisher.

So worthwhile.

Angled view of a surfacing router bit with gold-colored cutting inserts.

SpeTool W05004 ATS Coated Insert Mini Surfacing & Rabbeting Flycutter 2+2 Flute Design 1-1/4" Diameter x 1/4" Shank Router Bit

USD 51.99