The CMT 543.190.51 Mortising Chisel and Bit Set is a 3/4" diameter HSS (High-Speed Steel) tool designed for cutting clean, square mortise holes in wood. Built for use on any standard drill press mortising attachment or dedicated mortising machine, this chisel and bit set makes traditional mortise-and-tenon joinery more precise and repeatable. Whether you are crafting furniture, building door frames, or tackling timber joinery, having a properly sized, high-quality mortising chisel set is the foundation of a strong and accurate joint.

Key Features

• 3/4" Cutting Diameter - produces a full 3/4" wide square mortise in a single plunge, matching standard tenon stock dimensions for accurate joinery without additional setup.
• HSS (High-Speed Steel) Construction - high-speed steel holds a sharp cutting edge through repeated use in both hardwoods and softwoods, reducing the frequency of resharpening and downtime at the machine.
• 3/4" Shank - the 3/4" shank fits the chuck of most standard drill press mortising attachments and benchtop or floor-standing mortising machines, ensuring a secure, wobble-free hold during cutting.
• Right-Hand (RH) Rotation - designed for right-hand rotation, which is the standard direction of virtually all drill press and mortising machine spindles, so the tool works correctly without any special configuration.
• Single-Tooth Bit Design (Z=1) - the single-tooth auger bit centers aggressively in the workpiece, evacuating waste material efficiently while the surrounding square chisel pares the walls clean in one pass.
• Compatible with Standard Mortising Attachments - fits any standard drill press mortising attachment or dedicated mortising machine, giving the set broad compatibility across a wide range of shop setups.

Why This Product

• Reliable mortise-and-tenon joinery starts with the right chisel size - a 3/4" mortising chisel and bit is one of the most commonly needed sizes for furniture construction, door and window frame work, and general wood joinery, making this set a practical addition to any woodworking shop.
• HSS material means durability through demanding use - high-speed steel resists heat buildup during cutting, which helps the tool maintain its edge longer when working through dense hardwoods or high-volume production tasks.
• One tool, one pass - the combined chisel-and-bit design cuts and squares the mortise hole simultaneously, eliminating the need for a separate chiseling step and saving time on every joint.
• Broad machine compatibility reduces limitations - because this set is designed for any standard drill press mortising attachment, it is not locked to a single brand of machine, making it a flexible choice for shops with different equipment.

Specifications

• Manufacturer Part Number: 543.190.51
• Brand: CMT Orange Tools
• Diameter: 3/4"
• Shank: 3/4"
• Rotation: RH (Right-Hand)
• Material: HSS (High-Speed Steel)
• Number of Teeth: 1
• Tool Type: Mortising Chisel and Bit Set

Approved Applications

• Cutting square mortise holes in solid hardwood
• Cutting square mortise holes in softwood
• Traditional mortise-and-tenon joinery
• Furniture making and cabinet construction
• Door and window frame construction
• General wood joinery on drill press mortising attachments
• Use on benchtop and floor-standing dedicated mortising machines