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  • Lock Miter Router Bits

  • Video
  • Reviews
Make frames, boxes, right angle and parallel angle joints.

2 flute, carbide tipped. To join materials at 90° by cutting a 45° miter and a perfect matching tongue & groove glue joint. This joint not only increases mechanical strength, but also increases glue surface area and automatically aligns parts. Set-up blocks sold separately below.

Lock Miter Instructions (PDF)

Lock Miter Router Bits
Item # Thickness
of Stock
Large Dia. Shank
Size
Set-Up Block  
#5547 3/8 to 1/2" 1-3/8" 1/4" #9750 $29.95
#5548 1/2 to 3/4" 2" 1/4" #9751 $37.50
#7847 3/8 to 1/2" 1-3/8" 1/2" #9750 $36.50
#7849 1/2 to 3/4" 2" 1/2" #9751 $38.50
#7850 1/2 to 1-1/8" 2-3/4" 1/2" #9753 $47.50

Set-Up blocks sold separately below.

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MLCS lock mitre router bits

all customer reviews and ratings

Average Customer Rating: (5 reviews)
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limit the glue (5/5), May 22, 2015

By tom siegel (Charlevoix MI US)

Test cut in 12" long dry oak was absolutely perfect. Found the set up guide blocks useful.

Lept to a 7 foot long cut in walnut for box beams for a king size bed. Absolutely loved an earlier review suggesting leaving 1/16th or so in thickness when milling your own stock. I used a drum sander to remove the excess after the miter .. avoided risk of snipe on the planer .. got a knife edge.

Had early problem with glue-up. The tongue and groove, when using a single bit and single fence setting, are apparently so tight, there is little to no room for glue squeeze out .. especially in a 7 foot long joint.

Resorted to gluing only the 45 degree flat surfaces, leaving the tongue and grooves dry. Much better fit. Got the minimum desired squeeze out at the 90 degree inside and outside edges making for a very tight looking edge.

In my project, with the box frame still in three sides, I glued in some ribs to make up for any loss of strength I caused by not gluing the tongues and grooves.


strong drawer joint (5/5), May 31, 2013

By Ken Rupkalvis (San Antonio TX US)

I used this bit to make many drawer boxes for a very large desk. It's rock solid after glue up and very square off the router. I found the setup block helpful in that it cut setup time significantly.


Nice Joint (5/5), Oct 24, 2012

By John McCormick (Spring Te US)

I too used this bit to make table legs because I did not want to show a glue joint down the piece. I was very happy with the outcome. The setup block was nice but not 100% necessary.

Also, if you are milling your own wood to thickness, I recommend that you leave a sixteenth or so on the thickness before routing the lock miter. This way, you are not producing a sharp edge to ride on the out feed fence. Mill to final thickness after the miter has been routed.

Best of all, the joint produces a near perfect 90 degree joint with little effort. Just make sure to clamp it tight.


Very Versitile (5/5), Sep 5, 2012

By Paul Smith (Altoona PA US)

If you want to build a table leg made from 4 pieces of wood this is the answer. Used it to make legs for a Craftsman design dining room table. Many of my woodworking pals thought the legs were solid, but I explained how this bit works and a couple added this bit to their collections. Also, this is a great bit for making drawer boxes. The front, sides and back interlock and make a joint of unprecedented strength. Also, the set-up block is a near necessity for accurate joints. There are alternative set-ups but the block is easiest.


Avid DIY (5/5), Aug 5, 2012

By Paul J Schneider (Red Lodge MT US)

I have used this product and found it to be very useful, and would recommend it to anyone wanting a secure joint in their woodworking. The video is most helpful.


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  • Set-Up Blocks for Lock Miter Bits

  • Reviews
Save time, effort and wood.

The pre-cut joint profile allows quick, proper height adjustments with accurate setup everytime. The size of the set-up blocks varies: #9753 is 3-3/4" x 1-1/2", #9750 is 4" x 1-7/8", #9751 is 3-3/4" x 1-7/8". They're manufactured from ultra high molecular weight polymer. Items #9750 and #9751 are for 1/2" and 3/4" stock. Item #9753 is for 3/4" stock only. Instructions included. Note: The joint may need to be fine tuned after the first cut to get a perfect fit.

Set-Up Block for Lock Miter Instructions(PDF)

Set-Up Blocks for Lock Miter Bits
Item # Set-Up Block Profile Price  
#9750 Set-Up block for lock miter bits #5547 & #7847 $10.95
#9751 Set-Up block for lock miter bits #5548 & #7849 $10.95
#9753 Set-Up block for lock miter bits #7850 $10.95
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MLCS set-up blocks for mitre bits

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Average Customer Rating: (2 reviews)
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great cutter (5/5), Aug 19, 2014

By dennis curtis (myrtle point OR US)

just got my lock miter bit today. worked perfectly.. ordered the set up block for 1/2-3/4 stock. block setup made it fast and accurate. save yourself time, buy the setup block..


Non-laminated table legs (5/5), Oct 27, 2012

By John McCormick (Spring Te US)

I got my lock miter bit in a few weeks ago. I have use it to create table legs for a dining table I am making. I didn't want lamination joints showing where I built up the thickness so I used 3/4 inch stock and made essentially column for the legs. They turned out great. I ran a few practice boards and it didn't take me long to figure out it is best to leave the thickness about 1/16 inch from the final thickness just to have an edge to run along the out feed fence.


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  • Two Piece 22-1/2° Lock Miter Set

  • Reviews
Carbide Tipped Lock Miter Set

2 flute, carbide tipped 1/2" shank set. The 2 bit system joins material at 45° by cutting a 22-1/2° miter. Makes a perfect matching, strong tongue and groove joint. Easy set-up. Use for octagonal shapes on corner cabinet, entertainment centers, etc. For 1/2" to 15/16" stock. Set-Up Block sold separately below.

Lock Miter Instructions (PDF)

Lock Miter Router Bits
Item # Thickness
of Stock
Shank
Size
Set-Up Block  
#7740 1/2 to 15/16" 1/2" #9756 $49.95

Set-Up block sold separately.

Set-Up Block for Lock Miter Set #7740
Item # Set-Up Block Profile Price  
#9756 For two piece lock miter set #7740 (3/4" stock only) $10.95
MLCS lock mitre router bits

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