CMT 45 deg. Lock Miter Cutter Head - 5 1/2" Diameter, 1 1/4" Bore is a precision shaper machine cutter head engineered by CMT for milling clean, tight-fitting lock miter joints in stock up to 28mm thick. Designed for spindle moulders and shaper machines, this industrial-grade cutter head makes it straightforward to produce boxes, stretcher bars, picture frames, and a wide range of right angle or parallel joint assemblies. The 45 deg. cutting angle and twin HW carbide knives deliver repeatable accuracy on solid wood, engineered panels, and composite materials alike - making it a reliable workhorse for professional woodworking shops and production environments.

Key Features

• 45 deg. lock miter cutting geometry - produces precise, self-aligning miter joints that lock panels and frames together without complex fixturing, speeding up assembly and improving joint strength.
• 5 1/2" cutter head diameter with 1 1/4" bore (31.75mm) - sized for industrial spindle moulders and shaper machines, delivering stable, high-material-removal passes on thick stock.
• 2 HW (tungsten carbide) knives, 43x23x2mm [Z2] - hardmetal knife inserts provide long cutting life and clean chip removal across solid hardwood, softwood, and panel materials.
• Milling capacity for stock up to 28mm thick - handles real-world panel and solid wood dimensions commonly used in box making, frame construction, and cabinetry without requiring multiple passes.
• 1 1/8" cutting height - offers sufficient profile engagement depth to fully form the lock miter profile in a single pass, reducing setup time and improving throughput.
• Operating speed range of 5500 to 9500 RPM - a wide usable speed window lets operators tune feed rate and surface finish to the material being cut, from dense hardwoods to softer engineered panels.
• Hard aluminium alloy body with high resistance to tensile and yield stress - the cutter head body resists deformation under heavy shaper loads, maintaining concentricity and balance over a long service life.
• Compatible with spindle moulders and shaper machines - integrates directly into standard industrial tooling setups without adapters, reducing changeover time on the shop floor.

Why This Product

• Lock miter joints cut at 45 deg. are self-aligning during glue-up, which means less clamping hardware and faster assembly - making this cutter head a practical choice for box makers and frame builders working at volume.
• The hard aluminium alloy body paired with 2 HW carbide knife inserts balances lightweight handling with the cutting durability needed for repeated production runs on solid wood and panel materials.
• A broad RPM operating range of 5500 to 9500 RPM gives operators flexibility to dial in the right cutting speed for different materials, reducing tear-out on sensitive hardwoods or thin-faced panels.
• The 28mm maximum stock thickness capacity and 1 1/8" cutting height mean this cutter head accommodates the panel thicknesses most commonly used in furniture, cabinetry, and display box production without special modification.

Specifications

• Manufacturer Part Number: 694.011.31
• Brand: CMT Orange Tools
• Cutting Angle: 45 deg.
• Diameter: 5 1/2"
• Bore Diameter: 31.75mm (1 1/4")
• Cutting Height: 1 1/8"
• Maximum RPM: 5500 to 9500
• Number of Teeth: 2
• Knife Dimensions: 43x23x2mm
• Knife Material: HW (Tungsten Carbide)
• Maximum Stock Thickness: 28mm
• Body Material: Hard Aluminium Alloy
• Compatible Machines: Spindle Moulder, Shaper Machine

Approved Applications

• Milling 45 deg. lock miter joints in solid wood and panel stock
• Box construction and stretcher bar fabrication
• Picture frame and display frame production
• Right angle and parallel joint assembly projects
• Industrial moulding on spindle moulder and shaper machines
• Profiling solid wood, panels, and composite sheet materials

What's Included

• 1x CMT 694.011.31 45 deg. Lock Miter Cutter Head (5 1/2" diameter, 1 1/4" bore)
• 2x HW carbide knives, 43x23x2mm [Z2]

Frequently Asked Questions

What machines is this lock miter cutter head compatible with?

This cutter head is designed for use on spindle moulder and shaper machines. It accepts a 1 1/4" (31.75mm) bore, which is a standard industrial spindle diameter on those machine types.

What is the maximum stock thickness this cutter head can mill?

The CMT 694.011.31 is rated for milling lock miter joints in stock with a maximum thickness of 28mm. For best results, material should not exceed this dimension.

What types of materials can this cutter head be used on?

This cutter head performs on all materials but is ideal on solid wood and panels. The 2 HW (tungsten carbide) knife inserts are well suited to solid hardwood, softwood, chipboard, MDF, and similar engineered wood products.

What RPM range should I use when operating this cutter head?

The recommended operating speed range for this cutter head is 5500 to 9500 RPM. Always select a spindle speed within this range that is appropriate for the material being cut and the capacity of your machine.