Q: What's a lock miter joint good for?
It creates an interlocking corner that guarantees an accurate fit and adds more gluing surface than a standard miter, making it a stronger joint, especially in veneer plywood box construction.
16J7508 - 1 1/2" x 1/2" x 1/4" 45° Lock Miter Bit
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Our professional/industrial grade bits have tungsten carbide inserts ground on CNC (Computer Numeric Control) machines using 600x diamond wheels. Tungsten carbide maintains its hardness at high temperatures and holds an edge far longer than high-carbon or high-speed steels. The bit bodies have a non-stick coating for easy resin removal.
For better safety, the 45° lock miter bits should be used only in a router table equipped with a fence and not used free hand.
Each includes an advanced polymer friction-fit holder that can be mounted horizontally or upright.
It creates an interlocking corner that guarantees an accurate fit and adds more gluing surface than a standard miter, making it a stronger joint, especially in veneer plywood box construction.
No, this lock miter bit is designed for router-table use with a fence rather than freehand routing, for safety.
Rout two trial end-grain pieces and fit them together; if they're misaligned, adjust the bit height by only half the error and test again.
The bit removes the entire reference surface of the workpiece, so the outfeed end loses support after passing the bit; using larger stock and trimming to size afterward, or a support fixture, helps prevent this.
Match it to your stock thickness: the 1 1/2" bit suits 3/8" to 3/4" material, while the 1 3/4" bit handles thicker 1/2" to 1 1/2" stock for a half-blind joint.
| Materials | Tungsten carbide inserts; steel body |
| Dimensions | 1 1/2" diameter bit (3/8"–1/2" stock, blind joint; 5/8"–7/8" stock, half-blind joint); 1 3/4" diameter bit (1/2"–3/4" stock, blind joint; 1"–1 1/2" stock, half-blind joint) |
| Compatibility | 1 1/2" bit fits 1/4" or 8mm shank routers; 1 3/4" bit fits 1/2" or 8mm shank routers |
| Includes | Lock miter bits; friction-fit holder |
| Color/Finish | Non-stick coating for resin release |
| Package Quantity | 1 item |
| Safety | Designed for router-table use with a fence; not recommended freehand. |
| Warranty | Lee Valley Satisfaction Guarantee |
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45° Lock Miter Bits
Our professional/industrial grade bits have tungsten carbide inserts ground on CNC (Computer Numeric Control) machines using 600x diamond wheels. Tungsten carbide maintains its hardness at high temperatures and holds an edge far longer than high-carbon or high-speed steels. The bit bodies have a non-stick coating for easy resin removal.
For better safety, the 45° lock miter bits should be used only in a router table equipped with a fence and not used free hand.
Each includes an advanced polymer friction-fit holder that can be mounted horizontally or upright.