Slot cutters are used to cut a slot perpendicular to the router shaft. The slot cutter is like a little saw blade. It requires a Slot Cutter Arbor to mount it in the router. The height of the slot is controlled by the kerf of the slot cutter blade. The depth of cut is controlled by the size of bearing on the slot cutter arbor.

Slot cutters are 1-7/8" in diameter with a 5/16" arbor hole.

Depth of cut by bearing size - Bearings and arbors sold separately

Use 5/16" ID x 1-3/8" OD bearing for 1/4" depth of cut.
Use 5/16" ID x 1-1/8" OD bearing for 3/8" depth of cut.
Use 5/16" ID x 7/8" OD bearing for 1/2" depth of cut
Use 5/16" ID x 3/4" OD bearing for 9/16" depth of cut.
Use 5/16" ID x 5/8" OD bearing for 5/8" depth of cut.

Note: Slot cutter arbor and bearing are NOT included and must be purchased separately.

You can use a 5/32" kerf slot cutter to cut slots for biscuit joints. If you are considering this, we recommend you check the Whiteside Biscuit Joining Router Bit . It includes the slot cutter, arbor & bearings sized for joining with #0, #10 & #20 biscuits.

Kerf	Outside Diameter	Arbor Size	HW #	Whiteside #
1/16"	1-7/8"	5/16"	101551	6700A
3/32"	1-7/8"	5/16"	101552	6703A
1/8"	1-7/8"	5/16"	101553	6705A
5/32"	1-7/8"	5/16"	101554	6708A ♦
3/16"	1-7/8"	5/16"	101555	6709A
1/4"	1-7/8"	5/16"	101556	6710A
♦ 5/32" is used for cutting biscuit slots.

About Whiteside

Whiteside Machine Company was founded in 1970 in Bill Whiteside's basement where he supplied tooling to NC's huge furniture making industry. Whiteside is still family-owned but has now grown to occupy a 40,000 square foot factory in Claremont, NC.

Whiteside offers a full range of router bits. Their rigid quality control and precision manufacturing techniques have repeatedly resulted in highest ratings in Fine Woodworking magazine tool reviews.

In the years that we've sold Whiteside router bits, we've experienced the company's commitment to excellent quality and superb customer service. We think you'll be pleased each time you use these fine tools in your shop.

We toured the Whiteside factory in Episode 1 of The Highland Woodworker . Watch the whole episode or just the factory tour (about 6:30).

Groove Forming Router Bits