12 Best Undercut Saws for Door Casings (June 2026) Tested

Installing new flooring is one of the most satisfying home improvement projects you can tackle. But there is one step that trips up almost everyone: getting a clean, professional fit around door casings and jambs. That is where the best undercut saws for door casings make all the difference between a polished look and gaps you will notice every time you walk past.

An undercut saw, also known as a jamb saw, is a specialized cutting tool designed to trim the bottom of door frames, casings, and baseboards. This allows your flooring to slide underneath for a seamless transition. Whether you are laying hardwood, laminate, vinyl plank, or tile, undercutting the door casing is the right way to achieve that factory-finished appearance.

Our team spent weeks researching and comparing undercut saws across every category: corded power saws, cordless options, manual hand saws, and oscillating multi-tools that double as undercut saws. We looked at real user feedback from flooring contractors on Reddit and professional forums, compared specs from Crain, Roberts, DEWALT, and other brands, and narrowed the field to the 12 tools worth your attention in 2026.

Top 3 Picks for Best Undercut Saws for Door Casings

Best Undercut Saws for Door Casings in 2026

1. Crain No. 835 Heavy-Duty Undercut Saw – Best Professional Grade

I have used the Crain 835 on multiple flooring projects, and it is the tool that professional installers consistently reach for. The 13-amp motor spins the 6.5-inch blade at 6,500 RPM, which means it powers through oak door jambs and even embedded nails without bogging down. That alone sets it apart from lighter-duty saws.

The solid aluminum ratchet handle gives you precise control over the cutting angle, and the depth stop mechanism is one of the best I have worked with. You set the height once, and it holds consistently across dozens of door casings. For contractors who undercut jambs day in and day out, this consistency saves serious time.

One thing to keep in mind: at 19 pounds, this is a heavy tool. After undercutting 15 or 20 door jambs in a single afternoon, your arms will feel it. The vacuum attachment port is a nice touch, though you will want to pair it with a shop vac that has a HEPA filter for best dust collection results.

The blade guard can leave marks on lighter colored trim if you are not careful. I recommend applying painter’s tape along the trim before cutting to prevent any scuffing. Aside from that, the build quality is exactly what you would expect from Crain, which has been making professional flooring tools for decades.

Who Should Buy the Crain 835

Professional flooring installers and contractors who need a reliable, heavy-duty undercut saw for daily use. If you undercut more than 10 door casings per month, the Crain 835 pays for itself in time saved and cleaner results. It is also a solid choice for serious DIYers tackling a whole-house flooring project.

What to Watch Out For

The weight is the biggest factor. If you only need to undercut a few door jambs for a single room, the Crain 835 might be more tool than you need. Also, inside corners may require a quick finish cut with an oscillating multi-tool for a perfectly clean result. Budget for a quality replacement blade as well, since the stock blade will eventually dull.

2. Crain 575 Multi-Undercut Saw – Best for Dual-Angle Cuts

The Crain 575 takes a different approach from the 835. It uses an 8-inch carbide-tipped blade with 60 teeth spinning at 11,000 RPM, which gives you incredibly smooth cuts. The larger blade diameter also means you can cover a wider section of door casing in a single pass.

What makes this saw stand out is the dual-angle depth gauge. You can set it for straight cuts or flip it to a 45-degree angle, which is exactly what you need when undercutting door casings at a bevel. This feature alone saves you from making multiple passes or switching tools mid-job. At 10.85 pounds, it is noticeably lighter than the 835 as well.

The carrying case is a welcome inclusion that keeps the saw protected between jobs. However, I do have concerns about the 6-month motor warranty. Several users on contractor forums reported motor issues after limited use, and getting warranty support from the manufacturer was apparently difficult. For a tool in this price range, that is something to consider carefully.

Who Should Buy the Crain 575

Flooring installers who need the flexibility of dual-angle cuts in a lighter package than the 835. The 45-degree bevel capability makes this an excellent choice when your door casings require angled undercutting rather than straight flat cuts.

What to Watch Out For

The 6-month warranty on the motor is shorter than competitors. If you plan to use this saw heavily, consider purchasing from a retailer with a good return policy. Some users also reported difficulty completing inside corner cuts without switching to a multi-tool for the final cleanup.

3. igooo Heavy-Duty Undercut Saw EUS1800 – Best Value Power Saw

The igooo EUS1800 surprised me. For the price, you get a 2.5 horsepower motor spinning at 8,000 RPM, two alloy blades for wood cutting, a diamond blade for tile and masonry, a 13-foot power cord, and a carrying case. That is an impressive kit that covers almost every undercutting scenario you might encounter.

I especially like the height adjustment system, which keeps the blade parallel to the floor as you raise or lower it. The maximum cutting height is 1 inch, and the maximum depth against a wall is 1-1/4 inches, which is sufficient for most standard door casings and baseboard applications.

The diamond blade inclusion is a genuine advantage if you are working with tile floors. Most undercut saws in this price range only come with wood-cutting blades. Being able to undercut ceramic tile or masonry without buying a separate blade is a real cost savings. The one-year warranty and 30-day refund policy also provide peace of mind that you do not always get with lesser-known brands.

The main drawback is the depth guide locking mechanism. Several users noted that it can slip if not tightened firmly. I recommend double-checking the lock before each cut to ensure your depth stays consistent. Once you develop that habit, the saw performs admirably.

Who Should Buy the igooo EUS1800

DIY homeowners and semi-professional installers who want a complete undercutting kit without paying professional-grade prices. The included diamond blade makes this especially appealing if you are installing tile flooring and need to undercut masonry or ceramic materials alongside wood door casings.

What to Watch Out For

The depth guide lock requires extra attention to prevent slippage during cuts. The igooo brand does not have the same track record as Crain or Roberts, so long-term durability is an unknown. However, the one-year warranty and 30-day return window give you a reasonable safety net.

4. ToolTech 20V Cordless Undercut Saw – Best Cordless Option

If you have ever wrestled a power cord around door frames while trying to make precise undercutting cuts, you will appreciate what the ToolTech 20V brings to the table. This cordless undercut saw gives you full mobility without being tethered to an outlet, which is a game-changer when you are working your way through a house with multiple doorways.

The 8000 RPM motor delivers clean cuts through standard wood door jambs, and the 6-3/16-inch carbide-tipped blade has 36 teeth for a smooth finish. The D-handle grip feels comfortable and gives you good control over the tool. Height adjustment goes from flush up to 1-1/16 inch, which covers most flooring thicknesses.

The biggest issue is battery life. Under heavy use, the 4.0mAh battery lasts approximately 15 to 20 minutes. That might be enough for undercutting three or four door casings before you need to swap or recharge. If you are working on a large project with many doorways, you will want to invest in a second battery.

Another concern is the complete lack of warranty. For a tool at this price point, that is a notable omission. Several users also reported that no instructions were included in the package, which is frustrating if you are new to using undercut saws. The dust exhaust port does not work particularly well with shop vacuums either.

Who Should Buy the ToolTech 20V

Homeowners and installers who value cordless convenience for smaller flooring projects. If you are undercutting fewer than 10 door casings in a session, the battery life will likely be sufficient. The cordless design is especially useful in rooms where outlets are scarce or the cord would get in the way.

What to Watch Out For

Plan for the battery limitation. Either budget for a second battery or plan your cutting sessions around 20-minute intervals. The lack of warranty is a risk, so consider purchasing with a credit card that offers extended warranty protection as a backup.

5. ROBERTS Jamb Saw 17076 – Best Contractor Favorite

The Roberts 17076 is one of the most recognized jamb saws in the flooring industry. With 242 reviews and a loyal following among professional installers, it has earned its reputation as a reliable workhorse. The 5.8-amp motor spins at 10,000 RPM and features ball and needle bearings with spiral ground gears that deliver surprisingly smooth, quiet operation.

What sets this saw apart is its ability to cut full inside corners in molding up to 1/2-inch thick. Most undercut saws leave a small section at the inside corner that you need to clean up with another tool. The Roberts can often complete the cut in a single pass, saving you time on every doorway.

However, I need to flag the safety concern around blade changes. Multiple users have reported that the blade nut tightening process is dangerous, with short arbor nut studs that are prone to slippage. Several contractors on forum discussions recommend fabricating a custom blade guard shield for added protection. The OEM blade also tends to shed carbide tips relatively quickly, so plan on purchasing the Roberts 10-47-2 replacement blade sooner rather than later.

Who Should Buy the Roberts 17076

Flooring contractors and experienced DIYers who want a proven jamb saw with inside-corner cutting capability. If you appreciate the ability to cut full inside corners without reaching for a second tool, the Roberts 17076 is one of the few saws that can do it consistently.

What to Watch Out For

Exercise extra caution during blade changes due to the short arbor nut studs. The OEM blade quality is mediocre, so factor in the cost of a replacement blade with your purchase. The carrying case has also been reported to arrive damaged in some shipments, though the tool itself is well-built.

6. Kraft Tool FC518 Undercut Door Jamb Saw – Best Manual Saw

Sometimes the simplest tool is the right one. The Kraft Tool FC518 is a manual undercut saw that costs a fraction of any powered option. At just 1.3 pounds, it is light enough to use with one hand while you hold a spacer piece of flooring with the other. The 12-inch high-speed steel blade is long enough to reach across standard door casings.

I reach for this saw when I only have a few door jambs to undercut and do not want to drag out a power tool. It is also my go-to for tight spots where a powered undercut saw simply will not fit. The blade is replaceable, and the tool itself is made in the USA, which is a nice quality indicator.

The main safety concern is that the teeth run all the way to the corners of the blade with no guard. You need to be mindful of your hand placement, especially when cutting at awkward angles near the floor. I recommend wearing gloves and working slowly until you get a feel for the tool.

Who Should Buy the Kraft Tool FC518

DIY homeowners tackling a single-room flooring project or anyone who prefers a simple, no-power-tool approach. It is also an excellent backup saw to keep in your toolkit for touch-up cuts or tight spaces where powered saws cannot reach.

What to Watch Out For

The sharp, exposed teeth require careful handling. Place a scrap piece of flooring underneath the blade while cutting to protect your finished floor surface. The cuts will not be as clean as a powered saw, so expect to do some light sanding or trimming for a perfect finish.

7. JORGENSEN 10-Inch Dovetail Reversible Saw – Best Budget Manual Saw

The Jorgensen reversible dovetail saw is one of those tools that makes you wonder why all manual saws are not designed this way. The spring-loaded blade reverses direction, so you can cut from either the left or right side of a door casing without flipping the saw around. For undercutting work where you are crouched in awkward positions, this feature is incredibly practical.

The 13 TPI (teeth per inch) blade is induction hardened to HRC 58-68 hardness, which means it stays sharp through many door casings. The SK5 carbon steel blade is only 0.6mm thick, so it produces a thin kerf that minimizes waste and gives you precise control. The ergonomic handle with its soft-grip coating makes extended use comfortable.

At this price point, the Jorgensen is an easy recommendation for anyone who needs a manual undercut saw. The included tooth protector is a thoughtful touch that keeps the blade safe in your toolbox. It handles standard wood door jambs and soft trim with ease, though it is not designed for metal or masonry.

Who Should Buy the Jorgensen Dovetail Saw

Budget-conscious DIYers and homeowners who need a quality manual saw for occasional undercutting work. The reversible blade design makes it especially useful for both left-handed and right-handed users, or for situations where you need to approach the door casing from different angles.

What to Watch Out For

Some users noticed minor blade drift during longer cuts. Keep a steady hand and use light pressure to maintain a straight cut line. The blade width may be too wide for very detailed or precision woodworking applications, but for undercutting door casings it works well.

8. HAUTMEC 10-Inch Reversible Dovetail Saw – Best Value Flush Cut Saw

The HAUTMEC HT0234 is similar in concept to the Jorgensen, but it adds one important design feature: an offset cranked handle. This handle design allows you to hold the saw flat against the floor while cutting, which makes flush cuts along the bottom of door casings much easier. If you have ever tried to undercut a door jamb with a straight-handled saw, you know how awkward the angle can be.

The 12 TPI double-ground hardened blade cuts smoothly through wood, and the rigid carbon steel back keeps the blade straight during use. The reversible blade locks with a spring-loaded mechanism, allowing you to switch cutting direction in seconds. At just 310 grams, this is one of the lightest options in our entire roundup.

The limited lifetime warranty is a strong signal of confidence from HAUTMEC, especially at this price point. I have found that the cranked handle design reduces wrist strain during extended undercutting sessions. It is a small design detail that has a real impact on comfort and cutting accuracy.

Who Should Buy the HAUTMEC HT0234

Anyone looking for the best-value manual undercut saw for door casings. The offset cranked handle makes this the top choice among manual options for achieving truly flush cuts along the floor surface. Ideal for DIYers installing flooring in one or two rooms.

What to Watch Out For

The blade reversal pin occasionally does not seat fully, which can cause the blade to feel loose. Check the pin engagement before each use. For heavy undercutting jobs with many doorways, consider a powered option instead since manual cutting is significantly slower.

9. DEWALT Atomic 20V MAX Oscillating Tool – Best Cordless Multi-Tool

An oscillating multi-tool with a flush-cut blade is one of the most popular alternatives to a dedicated undercut saw. Professional contractors on forums consistently mention using oscillating tools for door jamb undercutting, and the DEWALT DCS354B is the top-rated cordless option available. With over 6,000 reviews and a 4.8-star rating, the user consensus is clear.

The brushless motor delivers noticeably longer run time than brushed alternatives, and the dual-grip variable speed trigger gives you precise control over cutting speed. The quick-change accessory system is a standout feature. You can swap blades in seconds without reaching for an Allen wrench, which is a huge time-saver when you are switching between cutting and scraping tasks.

For undercutting door casings, you will want to pick up a flush-cut wood blade (one is included). The tool accepts most universal oscillating tool accessories, so you are not locked into expensive proprietary blades. The LED light is surprisingly useful when you are working in dimly lit rooms or underneath cabinets.

The main consideration is that this is sold as a bare tool. You need to already own a DEWALT 20V battery and charger, or purchase them separately. If you are already in the DEWALT ecosystem, this is a no-brainer addition. If not, factor in the battery cost when comparing to dedicated undercut saws.

Who Should Buy the DEWALT DCS354B

Anyone who already owns DEWALT 20V batteries and wants a versatile tool that handles undercutting plus dozens of other tasks. It is the best cordless multi-tool for cutting door casings, trimming baseboards, removing grout, sanding, and scraping. Far more versatile than a dedicated jamb saw.

What to Watch Out For

The tool-only purchase means no battery or charger included. The oscillating action can vibrate quite a bit during extended use, so take breaks to prevent hand fatigue. While excellent for most undercutting tasks, it may struggle with extremely thick or dense hardwood door jambs compared to a dedicated power undercut saw.

10. DEWALT 3-Amp Oscillating Tool Kit – Best Corded Multi-Tool

The DEWALT DWE315K is the corded sibling of the Atomic 20V, and it comes as a complete kit with 29 accessories, a universal adapter, and a storage bag. The 3-amp motor delivers consistent power without the battery life concerns of cordless models. If you are undercutting door casings across an entire house, you will never run out of juice.

With nearly 2,700 reviews and an 87% five-star rating, this kit has been proven in the field by thousands of users. The variable speed trigger lets you dial in the perfect cutting speed for different materials. Slower speeds work better for delicate trim, while higher speeds power through thick door jambs.

The universal accessory adapter is a major advantage. It accepts third-party blades from brands like Bosch, Fein, and Dremel, so you are not limited to DEWALT accessories. The included wood blades are good quality, but you can also use specialized flush-cut and segmented blades for undercutting door casings.

The 3-year limited warranty provides long-term peace of mind that is uncommon in this category. My only real complaint is the blade clamp mechanism, which requires a firm grip to operate. Users with arthritis or limited hand strength may find it challenging. A hard case would also be preferable to the included soft bag.

Who Should Buy the DEWALT DWE315K

Homeowners and professionals who want a complete, ready-to-use oscillating tool kit straight out of the box. If you do not already own cordless tool batteries, this corded kit gives you everything you need to start undercutting door casings immediately, plus 28 additional accessories for other projects.

What to Watch Out For

The corded design means you need access to an outlet and must manage the power cord while working around door frames. The blade clamp requires firm hand pressure to operate. Some users reported receiving kits with missing blades, so verify the contents when your order arrives.

11. Hammerhead 2.2-Amp Oscillating Multi-Tool – Best Budget Oscillating Tool

The Hammerhead HAMT022 proves that you do not need to spend premium money to get a capable oscillating tool for undercutting door casings. With over 2,400 reviews and a 4.6-star rating, this budget-friendly tool consistently outperforms its price tag. The 2.2-amp motor delivers up to 20,000 oscillations per minute, which is more than enough for cutting through standard wood door jambs.

The variable speed dial lets you adjust cutting speed based on the material. I typically use a medium speed for pine door casings and a higher speed for harder woods. The universal collet system accepts standard oscillating tool blades, so you can upgrade to better quality flush-cut blades without compatibility issues.

The LED light is a practical feature when you are working underneath cabinets or in poorly lit corners. The ergonomic grip is comfortable for short sessions, though extended use can cause some hand fatigue due to the vibration. The 2-year limited warranty is a solid inclusion at this price point.

The included accessories are the weakest part of this kit. The flush-cut blade and semicircle blade that come in the box are functional but not durable. I recommend buying a pack of quality replacement blades from a brand like DEWALT or Bosch alongside this tool. The blades are cheap and make a noticeable difference in cut quality.

Who Should Buy the Hammerhead HAMT022

Homeowners looking for the most affordable way to undercut door casings with a power tool. If you are doing a one-time flooring project and want something better than a manual hand saw without investing in a professional-grade tool, the Hammerhead gives you capable performance at a budget-friendly price.

What to Watch Out For

The included blades are low quality and will need replacing for best results. The tool is loud at its highest speed setting, so consider ear protection. Being corded means you need an outlet nearby, which can be inconvenient when moving between rooms.

12. ROBERTS 10-47-2 Carbide Tip Saw Blade – Best Replacement Blade

If you already own a Roberts jamb saw, the 10-47-2 is the replacement blade you will eventually need. The OEM blade that comes with the Roberts 17076 tends to lose carbide tips relatively quickly, and this 36-tooth carbide-tipped blade is the standard upgrade. With 500 reviews and a 4.7-star rating, it is a proven performer.

The 6-3/16-inch diameter fits the Roberts 10-55 jamb saw perfectly. The 36-tooth configuration gives you a balance between cutting speed and smoothness. The carbide tips hold their edge well through dozens of door casings, provided you avoid hidden nails embedded in the wood.

Speaking of nails, this is the main thing to watch out for. The carbide tips can chip or break if they contact steel nails hidden in the door frame. I recommend scanning the bottom of each door jamb with a magnet or stud finder before cutting. It takes an extra minute per doorway but can save your blade.

Who Should Buy the Roberts 10-47-2

Anyone who owns a Roberts jamb saw and needs a quality replacement blade. It is also worth picking up as a spare to keep on hand so you are never stuck with a dull blade in the middle of a flooring installation project.

What to Watch Out For

This blade is specifically designed for Roberts jamb saws and will not fit other brands. The 90-day warranty is shorter than expected. Always check for hidden nails before cutting to extend blade life significantly.

How to Choose the Right Undercut Saw for Door Casings

Picking the right undercut saw comes down to three main questions: how many door casings you need to cut, what type of material you are cutting through, and whether you prefer the speed of a power tool or the simplicity of a manual saw.

Power Source: Corded, Cordless, or Manual

Corded electric undercut saws like the Crain 835 and igooo EUS1800 deliver the most consistent power for heavy-duty jobs. They never run out of battery, and their motors are typically stronger than cordless alternatives. The tradeoff is managing the power cord while you work around door frames.

Cordless options like the ToolTech 20V offer freedom of movement but are limited by battery life. If you go cordless, plan to buy a second battery for larger projects. Oscillating multi-tools that run on 20V battery platforms (like the DEWALT Atomic) are a great choice if you already own batteries from the same brand.

Manual hand saws like the HAUTMEC HT0234 and Kraft Tool FC518 are the most affordable and simplest to use. They work well for small projects with fewer than five doorways. They are also silent, produce no dust, and require no maintenance beyond occasional blade replacement.

Blade Type and Material

Carbide-tipped blades are the standard for wood cutting. They hold their edge well and produce clean cuts through pine, oak, and other common door casing materials. The Crain 835 and Roberts 17076 both use carbide-tipped blades designed specifically for undercutting applications.

Diamond blades are essential if you need to undercut tile, stone, or masonry. The igooo EUS1800 is one of the few undercut saws that includes a diamond blade alongside standard wood-cutting blades, making it a versatile choice for mixed-material projects.

High-speed steel (HSS) blades are found on manual saws like the Kraft Tool FC518. They are sharp out of the box but dull faster than carbide. For occasional use, HSS is perfectly fine. For regular use, invest in carbide-tipped or diamond-coated blades.

Cut Depth and Height Adjustment

Most powered undercut saws offer height adjustment from flush (floor level) up to approximately 1-1/16 inch. This range covers the thickness of standard hardwood, laminate, vinyl plank, and most tile installations. The Crain 835 stands out with its depth stop mechanism that holds settings rock-solid across multiple cuts.

For thicker flooring materials, check the maximum cutting height specification before buying. The Roberts 17076 can undercut doors up to 1-3/4 inches thick, which is deeper than most competitors. The igooo EUS1800 cuts up to 1 inch in height and 1-1/4 inches deep against a wall.

Dedicated Jamb Saw vs Oscillating Multi-Tool

This is one of the most common questions in flooring forums. Dedicated jamb saws like the Crain 835 and Roberts 17076 are purpose-built for undercutting door casings. They offer consistent depth, wider blades that cover more area per pass, and better dust collection. Professional flooring installers almost always prefer dedicated jamb saws for speed and precision.

Oscillating multi-tools like the DEWALT models are far more versatile. You can undercut door casings, cut nails, remove grout, sand surfaces, and scrape adhesive with the same tool. For DIYers who will use the tool for many different projects beyond just undercutting, an oscillating tool often represents better overall value. As one contractor on Sawmill Creek put it, he used a Multimaster for undercutting door jambs professionally for years.

Rent vs Buy: Which Makes Sense for You

If you are a homeowner doing a single flooring project, renting a professional undercut saw from a home improvement store is a smart option. You can rent a Roberts Longneck Plus from Home Depot for around $20 for four hours, which is enough time to undercut all the door casings in a typical home. For anything beyond one project, buying becomes the better financial decision.

Final Thoughts on the Best Undercut Saws for Door Casings

Finding the right undercut saw for door casings does not have to be complicated. For professional contractors who need maximum power and precision, the Crain 835 Heavy-Duty Undercut Saw is the clear top pick. DIYers and homeowners looking for the best value in a power saw should consider the igooo EUS1800 with its included diamond blade and carrying case. And if you want the most versatile tool that handles undercutting plus dozens of other tasks, the DEWALT DWE315K oscillating tool kit is hard to beat.

For smaller budgets, the HAUTMEC HT0234 and Kraft Tool FC518 are excellent manual options that get the job done without the need for power. Whatever you choose, the best undercut saws for door casings in 2026 will help you achieve that clean, professional flooring installation you have been working toward.