10 Best Router Bits for Flattening Slabs in 2023

Woodworking is an art. You can get creative with a simple piece of wood and probably make it one of the most beautiful things in the world. Who knows?

But, the chief enemy of creativity is ‘lack of perfect tools! You know, Picasso can’t become legendary Picasso without his pencils and canvases. You also need some woodworking tools like a CNC machine with some top-notch router bits to show your creativity.

best router bit for flattening slabs

Visit any expert woodworking guy, you’ll most likely notice hundreds of different router bits. They always use the best router bit for flattening slabs and designing their canvases aka wood pieces.

A good router bit will not only save your time and energy but also ensures the best wood crafting. As you’re already here, you might have lots of queries in your mind about this gadget.

Just read on, and we’re going to cover almost everything you might need to know about this handy tool along with some recommendations.



Editor's Rating


BINSTAK CNC Spoilboard Surfacing Router Bits

5 out of 5

Insert Carbide Slab Flattening Router Bit

5 out of 5

ROOCBIT CNC Spoilboard Surfacing Slab Flattening Router Bit

4.5 out of 5

CNC Spoilboard Surfacing Wood Planer Bit

4 out of 5

Amana Tool – Insert Mini Surfacing & Rabbeting Flycutter

4.5 out of 5

List of 10 Best Router Bits for Flattening Slabs

Whether you are an expert wood maker or hobbyist, it’s very common to get confused while choosing a pitch-perfect router bit. But, we have already done comprehensive market research in search of the right tool for your job.

Here’s the list of the best router bits you may use for your next woodworking task.

1. BINSTAK CNC Spoilboard Surfacing Router Bit

BINSTAK CNC Spoilboard Surfacing Router Bits

Versatility, smoothness, and preciseness, are the main three attributes of this router bit. All of it makes this tool stand out from others.

The very first thing of this tool you will notice is none other than its carbide-tipped bit. The tip is sharp and can be used for a long time with minimal sharpening. Its blade can cut up to 2 diameters in length.

There’s a heat-resistant Teflon coating in this CNC router bit. This coating makes the maintenance process easier and suitable for industrial usage. It can trim and flatten the wooden slabs pretty smoothly than others within its budget range.

By the way, the solid wood surface isn’t the only application area of this tool. You can also use this 1/2″ shank on particle board, medium-density fibreboard aka MDF, acrylic, plywood panels, and other custom wooden surfaces too. Just don’t use it on any metallic element.

Moreover, this versatile woodworking tool works fine with not only CNC machines but also works with other automatic routers and table-mounted or handheld routers too.

Technical specification:

  • Carbide tipped bit
  • ½ inches shank
  • 2 inches cutting diameter
  • ½ inches cut length
  • 3 wings


  • Comes with protective rubber/wax on the blade
  • Compatible with both automatic and manual routers
  • Easy to set up with the router
  • Can design a smoother surface
  • Larger cutting diameter


  • Becomes dull on hardwoods
  • Might need to sharpen before first-time use

2. Insert Carbide Slab Flattening Router Bit for Planing

Insert Carbide Slab Flattening Router Bit for Planing

If you want to invest in a sturdy yet budget-friendly router bit, then this might be the most perfect tool for you. The design, cutting efficiency, and industrial-grade architecture make it the one that everyone prefers.

It contains 3 wings in it and all of these are tipped with carbide. Carbide makes the tips sharper and super strength. Further, the shank length and wing length make it a balanced tool for your CNC machine.

To ensure a high-quality finish, there are four cutting edges in it. These four edges will allow you to rotate the knife if needed. Thus if one side becomes dull, replace the carbide inserts using only a simple screwdriver.

Usually, this planer is good for flattening wood slabs. But, it also works pretty well with the plywood panels, particle boards, acrylics, MDF, etc. Even it is also pretty cheaper than solid carbide spiral bits and brazed router bits.

However, this router bit works not only with the CNC or other automatic routers but also suits well with the trimming machines or engraving machines too.

Technical specification:

  • Carbide made structure
  • 2 inches cutting diameter
  • ½ inches shank
  • 3 wings
  • Spiral type tool flute


  • Easy to change blades
  • Durable construction
  • Budget-friendly
  • Sharp-edged
  • Versatile


  • Tough to balance
  • Inserts look dull

3. ROOCBIT CNC Spoilboard Surfacing Slab Flattening Router Bit

ROOCBIT CNC Spoilboard Surfacing Slab Flattening Router Bit

If you want to improve your woodworking experience, this ROOCBIT might be a good tool for you. Its architecture ensures an accurate cut every time you use it.

The blade of ROOCBIT best spoilboard surfacing bit is made of hard alloy. You know, the hard alloy made tools have an extended lifespan than the traditional blades. Further, its body is electroplated. Thus, you shouldn’t worry about any kind of rust issues.

You can remove or change the blade only by using a simple screwdriver. Thus it becomes a perfect choice for novice users. On the other hand, it also saves your processing cost, isn’t it?

Like the previous BINSTAK bit, most of the traditional router bits are designed only for use in the planks. But, this nifty tool can be used on aluminum too! Besides aluminum, it can flatten the normal surfaces like plywood panel, MDF, hard wooden surface, acrylic, particle board, etc.

Technical specification

  • 2- ½ inches cutting diameter
  • Hard alloy made blade
  • Screw offset design
  • Electroplated blade
  • Contains 4 wings


  • Good for the novice users
  • Offers smoother planing
  • Leaves no burr edges
  • Longer blade life
  • Can cut faster


  • Can’t be used on the hard aluminum surfaces
  • Screws get loosen after extreme usage

4. CNC Spoilboard Surfacing Wood Planer Bit

CNC Spoilboard Surfacing Wood Planer Bit

BINSTAK is one of the most popular brands in the router bit industry. They have manufactured lots of CNC machine tools over the years. As the fourth-best router bit for planing wood, we have also chosen a product of BINSTAK. Let’s have a look at how it performs.

The very first noticeable part of this tool is its wings. While most of the traditional CNC router bits come with 3 wings, you will get 4 wings in it. Thus you will get a better woodworking experience from this half-inch shank tool.

All of these 4 wings are made of super-strength steel. There will be 4 solid carbide inserts on those wings. All of these blades are heavily sharped and work great with any kind of timber. Being attached with screws, users can also change the blade using a simple screwdriver.

Another major advantage of this tool is its cutting diameter. While other router bits can be around 2 inches, this spoil board best surfacing router bit can cut exactly 3 inches! It’s really great to speed up your woodworking task.

Technical Specification:

  • Heavy-duty Carbide made body
  • 3 inches cutting diameter
  • Industrial insert knives
  • ½ inches shank
  • 4 wings


  • Comes with extra 4 screws
  • Larger cutting diameter
  • Higher efficiency
  • More balanced
  • More wings


  • Consumes more machine oil
  • Can’t cut with aluminum

5. Amana Tool – Insert Mini Surfacing & Rabbeting Flycutter

Amana Tool - Insert Mini Surfacing & Rabbeting Flycutter

Woodworking is the process of expressing the creativity of a woodworker. They are nothing but an artist who uses wooden surfaces as his canvas. Just like the other artists, the carpenter or hobbyist woodworkers also need the most perfect tool for their job.

While thinking about perfection, the only woodworking tool that pops into my mind is the Amana tool. Let’s focus on a few specific features of this tool.

The best feature of this router bit is its unique 2+2 carbide-made insert knife design. The first two knives work as up-shear and others work as a cutting flute. These knives look so beautiful and work more precisely than the normal CNC router bits.

The combination of these uniquely designed knives makes the planing process buttery smoother. Further, the blades are also made with Amana-exclusive carbide.

It ensures that users will get the best possible surface planing, rabbeting, or leveling experience from this tool.

Another major advantage of this machine appliance is its ability to work with large surface areas. For example, you can use it on hardwood, MDF, fiberboard, softwood, balsa core, plastic, fly cutter, high-density urethane (HDU Board), ultra-high molecular weight polyethylene (UHMWPE), etc.

Technical specification

  • Built with Amana-exclusive carbide
  • Better planing for 90° corners
  • 1 – ½ inches cutting diameter
  • 2+2 unique blade design
  • 4 different wing design


  • Uniquely designed for precise planing
  • Able to work with large surfaces
  • Maximum cutting efficiency
  • Works with all routers
  • Longer screws


  • Wings are only 0.1 inches’ lower
  • Requires frequent maintenance

6. BINSTAK 1/4″ Shank 1″ Cutting Diameter Wood Planer Bit


Here goes another decent-quality wood planer bit from BINSTAK. This planer bit is specially designed for those who are looking for a smaller and lightweight router bit.

Unlike the previous BINSTAK slab flattening router bit, they didn’t add 3/4 wings in it. Rather than that, they added only 2 blades to it. Both of these blades are designed with an anti-kickback design and built with super-strength steel.

The shank is also smaller than the normal router flattening bits. Its shank is only ¼ inches in length. Though the size of its carbide inserts is 12*12mm, its cutting diameter is only 1 inch and the max R.P.M is 18000.

Another satisfying fact about this bit is that you can use all 4 edges of the carbide inserts. These blades can be used for any kind of resurfacing, slab flattening, planing, or designing your wooden canvas.

Though the size is smaller, you won’t miss a single feature from this tool. For example, blades are easily removable, can plain almost all wooden surfaces, suits with both automated and manual machines, trimming machines, engraving machines, etc.

Technical Specification

  • 1-inch cutting diameter
  • All 4 edges are usable
  • Only ¼ inches shank
  • Max RPM 18000
  • 2 wings design


  • Improved finishing
  • Steel made blade
  • Smaller in size
  • Sharper blade
  • Balanced


  • Replacing the blades are a little bit difficult
  • Small screws aren’t up to the mark

7. Amana Tool RC-2248 Rabbeting Flycutter Slab Leveler & Surface Planer Router Bit

Amana Tool RC-2248 Rabbeting Flycutter Slab Leveler & Surface Planer Router Bit

Amana Tool has been developing industrial quality woodworking tools for over the last 40 years. We have already reviewed a decent router bit in this list. In this section, we are going to review another best router bit for flattening slabs or spoil boards.

The strongest point of this tool is its blade and RPM. This blade is suitable enough to work on almost any wooden surface. From the spoil boards to the hardwood, softwood, Balsa core, MDF, it is applicable everywhere.

The blade of this router planing bit is made of Amana-exclusive carbide. These carbide blades are totally insane. Besides the extra-sharp edges, you can operate this blade within 24,000 RPM (max).

Its rotating speed and sharper edges make it an unbeatable choice as a wood slabbing router bit. Even when the knives become dull, you can replace those just by using a simple screwdriver. Amana recommends using HMA-12 as the replacement.

Technical Specification

  • Cutting diameter 1 – ½ inches
  • Supports 24,000 RPM (max)
  • Cutting depth ¼ inches
  • Shank size ¼ inches
  • 2 wings


  • Precise cutting
  • Smaller in size
  • Sharper blade
  • Long lasting
  • Lightweight


  • No extra sets of screws will be available in the box
  • Blades need to be changed more frequently

8. KOWOOD 1/2” Inch Shank 2-1/4” (Dia.) Bottom Cleaning Router Bits

KOWOOD 1/2” Inch Shank 2-1/4” (Dia.) Bottom Cleaning Router Bits

KOWOOD is a brand of trust among DIY hobbyists and wordsmiths. While reviewing the router bits, we also collected a few tools from KOWOOD. After a series of thorough inspections, we have finally chosen this one.

The very first functionality of this router bit that amazed us is its vibration. This router sled bit can work a lot more smoothly than we’ve imagined. Probably KOWOOD makes it possible by keeping it smaller as well as using high-grade carbide to manufacture it.

Its ¼ inches shank along with the 2 – ½ inches carbide tipped blade results in smoother surfacing on any wooden surface. Being a smaller tool, you can also use it to clean up the old grooves, dadoes, or any kind of surfacing cuts.

Though this planing bit comes in a smaller architecture, its efficiency isn’t a single bit less than the traditional router bits.

You can use this tool with a wide range of routers including the table-routers and handheld routers. By the way, it can handle the highest 16,000 rpm. Don’t surpass it.

Technical Specification

  • High grade carbide tipped blade
  • Overall diameter 2 – ¼ inches
  • Shank diameter ¼ inches
  • 11/16 inch cutting depth
  • Highest RPM 16,000


  • Vibrates less while spinning
  • Razor sharp cutting edges
  • Bottom cleaning facility
  • Smaller in size
  • Durable


  • The middle point doesn’t touch the surface completely
  • Comparatively slower router speed

9. TIDEWAY Double Flute Carbide Tipped Cleaning Bottom Router Bit

TIDEWAY Double Flute Carbide Tipped Cleaning Bottom Router Bit

Now, we are talking about a router bit that would appeal to both novice and professionals in the woodworking arena. But, check out our review on this product below before making up your mind about investing in it.

TIDEWAY declares that their product can cut precisely, smoothly, and leaves no burr edges. Well, that’s true. Its anti-kickback design and minimal form factor offer more stability and precise cutting than the traditional router bits.

Further, the blade is tipped with Tungsten steel. You know, Tungsten is 5X stronger than traditional steel. The Tungsten tip along with the Industrial grade micro grain carbide(HRA92) makes the slicing, surfacing, and planing smoother than ever.

The bottom section is 2 inches wide and offers a bottom cleaning facility. So, its 15 mm rabbet won’t leave any dust or splinter on your wooden canvas.

Another interesting fact about this router bit is its Teflon coating. Teflon is a heat-resistant material. So, a layer of Teflon makes the product totally heat resistant.

You might already notice that we didn’t talk about the shank size or cutting diameter of this tool. Well, you got us! Actually, TIDEWAY made this tool in 19 different sizes. And the cutting diameter depends on the size of the tool.

The TIDEWAY router bit comes in a firm plastic box. This box protects this tool from any kind of damage it may fall into. Unlike the packages of other tools, you don’t need to throw away the package. Instead of that, use the package to store the tool after using it.

Technical Specification

  • Tungsten steel tipped blade
  • 15 mm deep rabbets
  • 19 different sizes
  • ½ inches shank
  • Teflon coated


  • Bottom cleaning facility
  • Extra sharper blade
  • Heat coated layer
  • Splinter free
  • Versatile


  • Blades need to sharpen frequently
  • Narrower cutting depth

10. Amana Tool 45525 Carbide Tipped 1-1/8 Dia x 1/2 CH x 1/4 Shank x 1-19/32 3-Flute Router Bit

Amana Tool 45525 Carbide Tipped 1-1/8 Dia x 1/2 CH x 1/4 Shank x 1-19/32 3-Flute Router Bit

Amana is a pacesetter in the woodworking industry. This brand produces lots of high-quality router bits over the years. And as the last product on our list, we have chosen the Amana Tool 45525 router bit as a decent tool. Let’s see whether it’s a worthy choice or not.

First of all, this tool is an all-in-one solution for pro wordsmiths. It offers a full range of applications for CNC, slab flattening routers and other routers. From spiral tooling to diamond tooling, tool holders, insert tooling, you can do everything you want with this tool.

The blade of this industrial quality tool is made of carbide. Thus you’ll get a smoother cutting experience every time you’ll use it. You will get 1.13 inches’ diameter by using its ½ inches shank.

While talking about the blade, the obvious next aspect is the blunt issue. Well, Amana attached the blades by using screws. So, you have nothing to worry about replacing or sharpening the tool. You can easily re-sharpen it without affecting the original state.
Cool! Isn’t it?

Technical Specification

  • 1.13 inches cutting diameter
  • Carbide tipped blade
  • ½ inches shank
  • 3 flutes


  • Maximum cutting efficiency
  • Faster blade removal
  • Highest quality cut
  • Ergonomic design
  • Easy to sharpen


  • Burns the wood while slowing down too much
  • Poor edge-retention

So, that’s all from us. We hope you will be able to choose your desired router planing bit from here.

Comparison Chart for Flattening Slab Router Bit for Planing

Here’s a simple comparison chart that will help you to select a worthy product for investment.

Product Name

Blade Material

Shank Size

Cutting Diameter

Tool Flute Type

Number of Wings

BINSTAK CNC Spoilboard


½ inch

2 inches



Insert Carbide


½ inch

2 inches



ROOCBIT Slab Flattening Router Bit

Electroplated Hard Alloy

½ inch

2 - ½



CNC Spoilboard Surfacing

Heavy Duty Carbide

½ inch

3 inches



Amana Tool – Insert Mini Surfacing

Amana exclusive Carbide

½ inch

1 - ½



BINSTAK 1/4″ Shank 1″ Cutting Diameter


¼ inch

1 inch



Amana Tool RC-2248

Amana exclusive Carbide

¼ inch

1 - ½



KOWOOD 1/2” Inch Shank 2-1/4” (Dia.)

Carbide tipped

½ inch

2 – ¼ inch



TIDEWAY Double Flute

Tungsten steel tipped

½ inch




Amana Tool 45525

Carbide tipped

¼ inch

1.13 inches



Things to Consider Before Buying a Router Bit for Planing

Flattening Slab Router Bit for Planing

We just presented our top 10 recommended router bits in the previous section. All of those are capable of doing a great job on woodworking. If you want to get the perfect one from this list, you have to pay attention to several selection criteria.

Let’s talk about those facts in short.

Shank Size

Shank is the cylindrical bottom of a router bit that is inserted into the router’s collet. Actually, the core value of a router bit depends on its shank size.

The most commonly used shank widths are ½ inches and ¼ inches. Both of those can be attached to a wide variety of routers. The ½ inch shanks are more efficient, versatile, reliable, and suitable for large jobs.

On the other hand, the ¼ inch shanks are good for light jobs which don’t need any kind of deep cutting.

Blade Material

The blade is the only part of a router bit that comes in direct contact with the wooden surface. Only a higher quality blade can ensure efficient surfacing and wood planing.

There are basically three different materials that are widely used as the blade material. Those are carbide, steel alloy, solid steel, etc. Most novice users tend to feel the urge of purchasing steel routers because of their lower price range.

The most efficient blade material is carbide. It is more rigid and provides better service in the long run. However, carbide is available in several quality grades. Amongst those, the most common grades are C2 and C3.

C3 is considered comparatively higher graded than C2. C3 can maintain its sharpness for a long time and is less prone to chipping. On the contrary, C2 is a comparatively more economic choice but it becomes dull more quickly.

However, we have noticed that manufacturers are using other blade materials on their router bits. For example, TIDEWAY tipped their blades with Tungsten and it works really well!

Anti-Kickback Technology

Decent woodworking requires the highest level of skill and tools legibility. And the carpenters need the best router bits to turn a normal wooden piece into art.

The router bits with anti-kickback technology help the wordsmiths to get the ultimate precision from a tool. So, try to invest in a tool that offers anti-kickback technology.


Installing a blade in the router bit feels like a walk in the park. Most of the blades are attached to the shank by using screws. So, you’ll need nothing but a simple screwdriver to attach or remove the blades.


Router bits are available in different shapes and designs. It’s obvious that not all of these will suit your machine. However, most of the advanced router bits are compatible with a wide range of router collets. Thus, people don’t manually check the compatibility issue most of the time.

But, different machines require different router bits to get the most perfect result. So, check the router bit properly whether it is compatible with your device or not before purchasing. It will save both time and money in the long run.


The Revolutions Per Minute aka RPM indicates the number of rotations per minute. The higher RPM will help you to get your job done within a minimum time. However, the average RPM of a router bit is around 20,000. Try to get a tool with as high rpm as possible.

Flute Section

Besides choosing a tool with higher RPM, you should consider the flute section too. It is one of the most important parts of a router bit that has a direct impact on the speed and cutting quality.

Normally the lower number of flutes results in a faster cutting. But, if you want a better quality finishing, you must need a tool with more flutes. So, it is recommended to purchase a flute with 2/3 flutes.

It might result in comparatively slower cutting, but you will be pleased to watch the perfect finishing.

Tool Balancing

Vibration is one of the most distracting factors for professional woodworkers. It not only hinders the delicate wood design but also ruins the surface. So, you must choose a router bit that doesn’t vibrate excessively while spinning.

However, you must keep an eye on the spinning issue too. Only a combination of good spinning and reduced vibration can deliver you the ultimate surfaced wood.

How to Flatten a Slab with A New Bit

In-depth full discussion the way to flatten live edge wood slab.

Frequently Asked Questions

What router bit to use for planing?

Every router bit with a durable infrastructure and sharper blade can be used for planing a timber surface efficiently. You might have already noticed that we reviewed the top 10 router bits which are available in the market right now.

You can choose any of those based on your requirements and budget. Please check the comparison table if you are running out of time. It will help you to get a quick decision.

Can I use my router to plane wood?

Yes, you can! Attach a high-quality router bit with your router and you can plane even the large piece of timbers with ease.

Should I choose the straight bit or the spiral one?

Basically, it depends on your project. The straight bits are renowned for their stable performance on stock surfaces. On the contrary, you should choose the spiral bits if you are working on a smoother surface.

Which shank width should I choose for my router?

The shanks are mainly available in two different sizes. Most of those are ½ inches or ¼ inches. You should choose any of those based on your requirements and project.

The ¼ inches shanks are suitable for novices or part-time hobbyists. These shanks can handle lightweight jobs properly. But, you shouldn’t opt for these shanks if you prefer deep cutting.

Contrariwise, ½ inches shanks are comparatively more reliable and efficient for large jobs. If you want a smoother and more professional cutting experience in a woodworking task, go for the ½ inches shanks.

When should I change the blade of my router bit?

Change the blade only when it feels dull. As simple as that!

But, you should have a look at two facts before changing. First of all, you can use all four edges of a blade in most cases. So, if an edge feels dull, just loosen up the screw and rotate the blade. That’s it! You just get a sharper blade again.

Secondly, you can easily sharpen those blades when it gets dull. A good quality router bit doesn’t lose its original cutting ability even after a series of the sharpening process.

What is a bottom-cleaning router bit?

Bottom cleaning router bits are a special kind of router bit that offers a faster and cleaner cut. The bottom cleaning function is especially needed while you are working on a large timber piece with a large portion of your wood remaining exposed.

These router bits are extremely useful to clean up the previously cut grooves, surface cuts, or even the dadoes too.

Last Words

It is very necessary to select the best router bit for planing to work seamlessly on a woodworking project. We hope this article has touched everything you’ll need to know about router bits.

Feel free to use the comment box below if you want to know anything about router bits. Our experts will provide professional answers to all of your inquiries ASAP.


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