Key Features
Clean 10 mm Mortises This Kreg Tool KLTJC-M10 mortise bit is built to cut 10 mm mortises for loose tenon joinery. The carbide-tipped cutter is there for one reason: cleaner finished walls and more consistent fit in real woodworking stock. Controlled Depth The included stop collar helps you set mortise depth accurately instead of eyeballing it. That matters when you want repeatable joinery across multiple parts without creeping too deep. Made for MortiseMate This is not a general-purpose drill bit. It is designed specifically for use with the Kreg MortiseMate loose tenon jig and matching loose tenon workflow, which is the whole point if you want the system to work as intended.
Overview
The Kreg Tool KLTJC-M10 10 mm mortise bit with stop collar is a joinery accessory made for cutting accurate mortises in wood when used with the Kreg MortiseMate system. This is a mortise bit designed for loose tenon joinery. If you are building furniture, cabinetry, face frames, or solid-wood assemblies and want repeatable mortises without stepping into a full benchtop mortiser setup, this is the part that handles the cutting.
From the images, the cutter is marked 10 mm, so the job here is straightforward: produce a mortise sized for 10 mm loose tenon work. That size matters because joinery only works when the mortise, the tenon, and the setup all agree. Instead of trying to adapt a random bit, this bit is matched to the MortiseMate workflow, which saves setup time and reduces fit issues.
The business end uses a carbide tip, and that is one of the more important details on a bit like this. In practical terms, carbide helps the bit hold its edge longer and cut cleaner in repeated use. For woodworkers making multiple mortises across rails, stiles, legs, or case parts, cleaner cutting means less cleanup and more confidence when parts come together at glue-up.
The included stop collar is just as important as the cutter itself. Mortise depth is one of those details that separates a snug, predictable joint from one that needs fixing later. A stop collar gives you a hard reference so you can repeat the same depth across matching parts, which is exactly what you want when making loose tenon joints in production runs or even one careful project.
Design-wise, this is clearly a purpose-built accessory rather than a generic woodworking bit. The product images show it being installed in a drill and used through the Kreg MortiseMate loose tenon jig, which tells you how Kreg intends it to be used: guided, repeatable, system-based joinery. That is a big deal for users who want a simpler path to mortise-and-tenon style construction without switching to a dedicated mortising machine.
Compatibility is also very clear. This bit is exclusively for use with the Kreg MortiseMate loose tenon jig and loose tenons. That means it is the right buy for someone already working in that Kreg joinery platform or planning to start with it. If you are shopping for a general drilling or boring bit, this is not that. If you want a matched cutter for the MortiseMate setup, it makes much more sense.
Who should buy it? Woodworkers, cabinet installers, trim carpenters, and serious DIY users who want clean loose tenon joinery with a guided jig system. If your work involves furniture parts, boxes, casework, frames, or panel assemblies where alignment and joint strength matter, this kind of system-specific mortise bit is a practical piece of the process.
Cut Clean Mortises with a Matched System
The Kreg Tool KLTJC-M10 10 mm mortise bit is made to do one job well: cut clean mortises for loose tenon joinery. Because it is a dedicated MortiseMate accessory, setup is more straightforward than piecing together a workaround with a random bit.
- 10 mm cutter size is marked on the bit
- Carbide tip is built for cleaner finished mortises
Set Depth Once and Repeat It
Depth control is where loose tenon joinery gets consistent, and the stop collar is there to make that easier. Once set correctly, it helps keep matching mortises uniform across multiple parts, which is what saves time during dry-fit and glue-up.
- Includes stop collar for controlled mortise depth
- Designed specifically around the Kreg MortiseMate workflow
What’s in the Box
- (1) 10 mm mortise bit
- (1) Stop collar
Key Specifications
| Bit Size | 10 mm |
|---|---|
| Tip Material | Carbide-tipped |
| Tool Type | Mortise bit |
| Depth Control | Stop collar included |
| Primary Use | Loose tenon joinery |
| Compatibility | Kreg MortiseMate loose tenon jig and loose tenons |
Compatibility
Jig System Exclusively for use with the Kreg MortiseMate loose tenon jig. Joinery Format Designed for loose tenon joinery using matching loose tenons within the MortiseMate system.
Built For
Woodworking Cabinetry Furniture Building Loose Tenon Joinery Casework Trim and Finish Carpentry
Pro Tip
Before cutting your project parts, set the stop collar and run a test mortise in the same species and thickness of scrap. It is the fastest way to confirm depth and tenon fit before you start making matching joints for real.
Tool Nut’s Take
Tool Nut’s Take
Kreg Tool KLTJC-M10 mortise bit that keeps the system honest
If you are using MortiseMate, this is the kind of matched accessory that makes the setup worth owning in the first place.
- Who it’s for: Woodworkers and carpenters using the Kreg MortiseMate system for repeatable loose tenon joinery.
- Why it stands out: The 10 mm carbide-tipped cutter and included stop collar are aimed at two things that matter most here: clean mortises and consistent depth.
- Worth knowing: This is a system-specific mortise bit, not a catch-all drilling accessory, so buy it when you need the right cutter for the MortiseMate workflow.
Common Questions
- What size mortises is this bit made to cut? The bit is marked 10 mm, so it is intended for 10 mm mortise work.
- Is this a general-purpose woodworking bit? No. The product imagery states it is exclusively for use with the Kreg MortiseMate loose tenon jig and loose tenons.
- Why does it include a stop collar? The stop collar is used to help set precise mortise depth for more repeatable joinery.
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