12-28 Drill Bits | McMaster-Carr

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2 Products

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

Combination Drill Bit/Taps

Spiral Flute

Drill holes and cut threads without switching tools. Made of high-speed steel, these taps are for use on most metal and plastic. The square shank is compatible with tap holders for drill presses and milling machines. All have a plug chamfer with 3-5 chamfered cutting threads, so they're suitable for start-to-finish tapping.

Taps with spiral flutes keep chips clear by drawing them back toward the tap and out of the hole.

Uncoated taps are strong enough for most tapping jobs but have a shorter tool life.

For technical drawings and 3-D models, click on a part number.

Inch

Thread			Drill Bit						Plug Chamfer
Size	Lg.	Overall Lg.	Size	Decimal Size Equivalent	Point Angle	Flute Type	Thread Type	Pitch Dia. Limit		Each
Uncoated High-Speed Steel
12-28	21/32"	2 3/8"	15 ga.	0.18"	110°	Spiral	UNF	H3	0000000	000000