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Specialized Router Bits: Screw Slot Bits for Cutting Countersinks and Counter-Bores
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Screw Slot Bits from MLCS These Screw Slot Bits from MLCS allow your router to replace a drill press in cutting quick, accurate screw slots.

Making slots for screws — rather than simply drilling around pilot holes — is sometimes essential to allow for wood movement or for adjustability. But making those slots can be really putzy.

Countersink cut with a router bit One slot cutting bit will cut a slot with a countersink for laying in the screw.

Did you know you can get a router bit to cut those slots? Two, in fact: one to make a slot with a countersink for a flathead screw, another for a counterbored slot for a roundhead screw. Both are proportioned for #8 screws.

Counterbore cut screw slot Another bit is capable of cutting the counterbore slot for a #8 screw, and along with a plunge router can make blind slots.

Use the bit in a plunge router (or in a table-mounted router) to cut a slot in one quick operation.

posted on December 1, 2008 by Bill Hylton
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One thought on “Specialized Router Bits: Screw Slot Bits for Cutting Countersinks and Counter-Bores”

  • Teri Henderson
    Teri Henderson March 18, 2015 at 6:00 am

    How well would this bit hold up in a plunge router performing counter sink hole for screws in 1/2" phenolic material vs a slot? The phenolic material is medium to high density.

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