The CMT 855.503.11 Lock Miter Bit is a precision-engineered router bit designed to cut strong, interlocking 45 deg. miter joints for box construction, frames, stretcher bars, and right-angle or parallel joinery projects. Built with a 2 3/4 in. cutting diameter and a 1/2 in. shank, this two-flute tungsten carbide bit handles stock from 19/32 in. up to 1 1/8 in. thick, giving woodworkers a versatile single-bit solution for both miter and parallel glue joints. The anti-kickback body design keeps each pass controlled and consistent, whether you are running solid hardwood on a router table or milling MDF panels for cabinetry.

Key Features

• Tungsten Carbide (HW) Cutting Edges - industrial-grade carbide retains a sharp edge longer through dense hardwoods and composite sheet goods, reducing the need for frequent resharpening.
• Anti-Kickback Body Design - limits the depth of cut per pass, so the bit stays in control and the workpiece feeds smoothly, lowering the risk of dangerous kickback at the router table.
• 45 deg. Lock Miter Geometry - mills a self-aligning interlocking miter profile that registers parts together during glue-up, eliminating the need for complicated clamping setups on box and frame joints.
• 2-Flute (2-tooth) Configuration - balanced cutting action produces a cleaner surface finish on the miter face, reducing sanding and prep time before assembly.
• Right-Hand (RH) Rotation - compatible with standard handheld routers, router tables, and CNC routing machines that use conventional right-hand spindle rotation.
• 1/2 in. Shank - the larger shank diameter compared to a 1/4 in. shank provides greater rigidity and reduced vibration when cutting with a 2 3/4 in. diameter bit, resulting in a more accurate and cleaner joint profile.
• 19/32 in. to 1 1/8 in. Material Thickness Range - accommodates a broad range of stock thicknesses in a single setup, making the bit practical for cabinet sides, box panels, and frame stock without changing tooling.
• Parallel Joinery Capability - the same bit profile that cuts lock miter joints can also mill parallel glue joints by repositioning the workpiece flat on the table, so one bit serves two joint types.

Why This Product

• A single bit handles both lock miter and parallel glue joint profiles by simply changing workpiece orientation - so woodworkers can tackle boxes, frames, and stretcher bars without swapping tooling mid-project.
• The interlocking 45 deg. miter profile self-registers mating parts during assembly, which keeps corners square and dramatically simplifies glue-up clamping on box and cabinet projects.
• The anti-kickback body limits material engagement on each pass, making this bit a safer and more forgiving choice for routing large-diameter profiles in hardwood and composite materials.
• The 19/32 in. to 1 1/8 in. working thickness range covers typical cabinet panel and frame stock dimensions, and the range can be extended further by adding a second smaller bit - giving this tool long-term versatility in a production or shop environment.

Specifications

• Manufacturer Part Number: 855.503.11
• Brand: CMT Orange Tools
• Angle: 45 deg.
• Diameter: 2 3/4 in.
• Cutting Height: 1 1/4 in.
• Total Length: 2 3/4 in.
• Shank: 1/2 in.
• Maximum Material Thickness: 19/32 in. to 1 1/8 in.
• Number of Teeth: 2
• Rotation: Right-Hand (RH)
• Cutting Material: Tungsten Carbide (HW)

Approved Applications

• Box and cabinet corner construction using 45 deg. lock miter joints
• Frame and stretcher bar joinery
• Right-angle joint milling in hardwood, softwood, plywood, and MDF
• Parallel glue joint milling using the same bit with an adjusted workpiece orientation