NPT Drill Bits | McMaster-Carr

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24 Products

Tap, Die, and Drill Bit Sets

Cut and repair threads and drill holes in many different sizes. Tap and die wrenches are included. The dies are hex shaped for use with conventional wrenches. The taps are made of carbon steel and are recommended for thread repair and occasional tapping.

Taper Chamfer—Taper chamfer taps have 7-10 chamfered threads at the tip for cutting into the workpiece. They require less torque than other chamfer types, making them a good choice for starting threads and tapping through holes. However, a longer taper means that they cannot thread as close to the bottom of closed-end holes.

Plug Chamfer—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.

	Drill Bit Sizes Included	Container Type	Includes	Tap Chamfer Type		Each
Carbon Steel







	Right-Hand Thread

	117	4-40, 6-32, 8-32, 10-24, 10-32, 12-24, 1/8"-27, 1/8"-28, 1/4"-20, 1/4"-28, 5/16"-18, 5/16"-24, 3/8"-16, 3/8"-24, 7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, M3 × 0.50 mm, M4 × 0.70 mm, M4 × 0.75 mm, M5 × 0.80 mm, M5 × 0.90 mm, M6 × 1.00 mm, M7 × 1.00 mm, M8 × 1.00 mm, M8 × 1.25 mm, M9 × 1.00 mm, M9 × 1.25 mm, M10 × 1.25 mm, M10 × 1.50 mm, M11 × 1.50 mm, M12 × 1.50 mm, M12 × 1.75 mm	4-40, 6-32, 8-32, 10-24, 10-32, 12-24, 1/8"-27, 1/8"-28, 1/4"-20, 1/4"-28, 5/16"-18, 5/16"-24, 3/8"-16, 3/8"-24, 7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, M3 × 0.50 mm, M4 × 0.70 mm, M4 × 0.75 mm, M5 × 0.80 mm, M5 × 0.90 mm, M6 × 1.00 mm, M7 × 1.00 mm, M8 × 1.00 mm, M8 × 1.25 mm, M9 × 1.00 mm, M9 × 1.25 mm, M10 × 1.25 mm, M10 × 1.50 mm, M11 × 1.50 mm, M12 × 1.50 mm, M12 × 1.75 mm	5/64", 7/64", 5/32", 1/4", 19/64", 5/16", 21/64", 3/8", 25/64", 13/32", 27/64", 29/64", 43 ga., 39 ga., 36 ga., 30 ga., 29 ga., 25 ga., 21 ga., 20 ga., 16 ga., 9 ga., 7 ga., 3 ga., B, F, H, I, J, O, Q, R, S, U, Z	Plastic Case	Die Wrench (2), Extractor (5), Tap Wrench (3), Thread Gauge (2)	Taper, Plug	82955A11	0000000

Heavy Duty Air-Powered Drills


Style A	Style B	Style C	Style D

Rated for continuous use, these tools take on your tough drilling jobs. They have heavy duty bearings and hardened steel gears.

For Threaded-Shank Drill Bits—These drills have a threaded spindle instead of a drill chuck for use with threaded-shank drill bits (sold separately).

Style B—Style B have a variable speed that lets you set the motor speed at less than the maximum no-load speed.

Keyed Chuck—Drills with keyed chuck can be tightened with the included key.

									Air Inlet
	Style	For Max. Bit Shank Size	For Bit Shank Thread Size	Max. No-Load Rotational Speed, rpm	Drive Direction	Chuck Type	Power, hp	Average Air Consumption @ Pressure	Pipe Size	Thread Type	Gender	Exhaust Location	Overall Lg.	Wt., lb.		Each
For Hex and Round Bit Shanks



		A	1/4"	—	4,000	Clockwise, Counterclockwise	Keyed	1	7.5 ft³/min @ 90 psi	1/4	NPT	Female	Back	7 3/32"	2.5	3130A33	0000000


		B	1/4"	—	4,000	Clockwise, Counterclockwise	Keyed	1	7.5 ft³/min @ 90 psi	1/4	NPT	Female	Back	9 5/16"	2.5	3130A29	000000
		B	3/8"	—	1,200	Clockwise, Counterclockwise	Keyed	1	7.5 ft³/min @ 90 psi	1/4	NPT	Female	Back	10 13/16"	3	8894A11	000000
		C	1/2"	—	550	Clockwise	Keyed	1	8 ft³/min @ 90 psi	1/4	NPT	Female	Side	13 3/8"	7	3131A12	00000000


		For Threaded-Shank Drill Bits



				D	—	1/4"-28	2,400	Clockwise	—	2/5	22 ft³/min @ 90 psi	1/4	NPT	Female	Back	11 3/32"	2	29955A21	00000000


				D	—	1/4"-28	5,300	Clockwise	—	2/5	22 ft³/min @ 90 psi	1/4	NPT	Female	Back	10 11/16"	2	29955A22	00000000

Light Duty Air-Powered Drills


Style A	Style B	Style C	Style D

Style E	Style F	Style G

Designed for intermittent use.

Styles E-G—Styles E, F, and G have a lever throttle with a lock to prevent accidental starts.

Keyless Chuck—Drills with keyless chuck open and close without a key for fast bit changes.

Keyed Chuck—Drills with keyed chuck can be tightened with the included key.

								Air Inlet
	Style	For Max. Bit Shank Size	Max. No-Load Rotational Speed, rpm	Drive Direction	Chuck Type	Power, hp	Average Air Consumption @ Pressure	Pipe Size	Thread Type	Gender	Exhaust Location	Overall Lg.	Wt., lb.		Each
For Hex and Round Bit Shanks



		A	3/8"	2,000	Clockwise, Counterclockwise	Keyed	1/2	4 ft³/min @ 90 psi	1/4	NPT	Female	Back	7 1/2"	2.5	27755A17	000000


		B	3/8"	2,000	Clockwise, Counterclockwise	Keyless	1/2	4 ft³/min @ 90 psi	1/4	NPT	Female	Back	7 1/2"	2.5	27755A22	00000
		C	3/8"	20,000	Clockwise	Keyed	0.33	4 ft³/min @ 90 psi	1/4	NPT	Female	Front	5"	2	27755A12	000000
		D	1/2"	840	Clockwise, Counterclockwise	Keyed	1/2	6.9 ft³/min @ 90 psi	1/4	NPT	Female	Handle	10 3/8"	3.1	28105A25	000000
		E	3/8"	20,000	Clockwise	Keyed	0.48	4 ft³/min @ 90 psi	1/4	NPT	Female	Front	6 1/2"	2	27755A14	000000
		F	3/8"	2,100	Clockwise, Counterclockwise	Keyed	2/5	5.3 ft³/min @ 90 psi	1/4	NPT	Female	Handle	9 1/4"	2.4	27825A22	000000
		G	3/8"	2,000	Clockwise, Counterclockwise	Keyed	0.3	5.3 ft³/min @ 90 psi	1/4	NPT	Female	Handle	8 5/8"	2.6	27825A32	000000

Helical Threaded Inserts for Pipe Threads with Installation Tools

Fix stripped pipe threads fast—these inserts come with drill bits, through-hole taps, and installation tools. Also known as Heli-Coil inserts.

Pronged—The prong attaches to an installation tool for precise control as you drive inserts in. Remove the prong with a punch or break-off tool before inserting a screw.

18-8 Stainless Steel—The choice for wet and outdoor environments, these inserts resist rust and mild chemicals.

	For Max. Hole Dia.	No. of Inserts Included	Includes		Each
Pronged NPT Thread







	18-8 Stainless Steel

	1/8	0.273"	3/8"	0.375"	12	Drill Bit Installation Tool Through-Hole Tap	91733A421	0000000


	1/4	0.394"	33/64"	0.516"	12	Drill Bit Installation Tool Through-Hole Tap	91733A422	000000
	3/8	0.407"	21/32"	0.656"	10	Drill Bit Installation Tool Through-Hole Tap	91733A423	000000
	1/2	0.534"	13/16"	0.813"	10	Drill Bit Installation Tool Through-Hole Tap	91733A424	000000

Medium Duty Air-Powered Drills


Style A	Style B	Style C	Style D

More durable than our light duty drills, these are excellent for general purpose drilling jobs.

Keyed Chuck—Drills with keyed chuck can be tightened with the included key.

								Air Inlet
	Style	For Max. Bit Shank Size	Max. No-Load Rotational Speed, rpm	Drive Direction	Chuck Type	Power, hp	Average Air Consumption @ Pressure	Pipe Size	Thread Type	Gender	Exhaust Location	Overall Lg.	Wt., lb.		Each
For Hex and Round Bit Shanks



		A	3/8"	2,000	Clockwise, Counterclockwise	Keyed	1/2	4 ft³/min @ 90 psi	1/4	NPT	Female	Back	6 3/8"	2.5	28495A12	0000000


		A	3/8"	2,000	Clockwise	Keyed	1/2	4 ft³/min @ 90 psi	1/4	NPT	Female	Back	7 13/16"	2.5	28495A11	000000
		B	3/8"	2,000	Clockwise, Counterclockwise	Keyed	1	7.5 ft³/min @ 90 psi	1/4	NPT	Female	Back	7 19/32"	3	2803A13	000000
		B	3/8"	2,600	Clockwise	Keyed	1	7.5 ft³/min @ 90 psi	1/4	NPT	Female	Back	7"	2.5	2803A11	000000
		C	1/2"	800	Clockwise, Counterclockwise	Keyed	1/2	6 ft³/min @ 90 psi	1/4	NPT	Female	Back	8 1/2"	3.5	27755A18	000000
		D	3/8"	1,800	Clockwise, Counterclockwise	Keyed	1/2	4.6 ft³/min @ 90 psi	1/4	NPT	Female	Back	7"	2.5	27755A21	000000