Counterboring—Enlarge the top of an existing hole to create a cylindrical-shaped opening with a flat bottom that acts as a seat for the head of a screw or wood plug.

The same tool lets you drill and counterbore holes with enough clearance for socket head screws.

	Dia.
For Screw Size, mm	Body, mm	Shank	Drill Tip, mm	Overall Lg.	Number of Flutes	For Use On		Each
Uncoated High-Speed Steel
10	16.66	1/2"	10.32	2 5/32"	2	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	00000000	000000

Tap and Drill Bit Sets

Set with Metal Case

Drill and tap a variety of hole sizes. These taps and drill bits are for use on metal and plastic.

High-speed steel taps and drill bits have a longer tool life than carbon steel. Uncoated high-speed steel taps and drill bits are strong enough for most jobs but don’t last as long as other high-speed steel taps and drill bits. Use them for small-scale jobs.

Plug-chamfer taps are a versatile choice for most tapping applications. With 3-5 chamfered cutting threads, they require moderate torque and are often used for start-to-finish tapping of through holes and closed-end holes. However, they do not start threads as easily as taper chamfers. When using them to tap closed-end holes, be sure to leave sufficient space at the bottom for chips to accumulate.

Uncoated High-Speed Steel Taps
No. of Pieces	Chamfer Type	Tap Sizes Included	No. of Flutes	Drill Bit Sizes Included	Drill Bit Material	Container Type		Each
36	Plug	1 each of sizes: 6-32 6-40 8-32 8-36 10-24 10-32 12-24 12-28 1/4"-20 1/4"-28 5/16"-18 5/16"-24 3/8"-24 3/8"-16 7/16"-14 7/16"-20 1/2"-13 1/2"-20	3, 4	1 each of sizes: 25/64" 27/64" 29/64" 5/16" 36 ga 33 ga. 25 ga. 21 ga. 16 ga. 15 ga. 7 ga. 3 ga. F I Q U 2 each of size 29 ga.	Black Oxide High-Speed Steel	Metal Case	0000000	0000000

2 Products

About Counterbores

Metric Size Drill-Point Counterbores

Tap and Drill Bit Sets