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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: (4 reviews)
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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.


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.


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.


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.


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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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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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