Carbide Taps | McMaster-Carr

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Taps

Cut threads into holes so screws, bolts, and rods fit snugly. Our basic taps have straight flutes that are good for most jobs.

Carbide—The hardest and most wear-resistant taps. They last 10 times longer than high-speed steel for the best performance on hard and abrasive materials like nickel and fiberglass. Carbide can be brittle, however, so these taps require a rigid machine tool holder to prevent breakage and should not be used for hand tapping.

Titanium Aluminum Nitride (TiAlN) Coated—No taps last longer. These are the best for high-speed, high-temperature drilling of tough materials such as iron and titanium.

Plug Chamfer—These taps thread through holes and blind holes. The tapered section is shorter than a taper chamfer and longer than bottoming chamfer. As a result, they're easier to turn than bottoming taps but require more force than taper taps.

Bottoming Chamfer—Cut all the way to the bottom of blind holes with taps that have the shortest taper. Since these require the most force to turn, they’re often used to finish holes started by taper- or plug-chamfer taps.

Number of Flutes—Taps with fewer flutes have more space to capture chips, so you won’t have to clear them as often. However, they can be more difficult to keep straight in the hole.

						Drill Bit			Plug Chamfer		Bottoming Chamfer
	Thread Size	Thread Lg.	Overall Lg.	Thread Type	No. of Flutes	Size	Decimal Size Equiv.	Shank Type		Each		Each
Carbide





				Titanium Aluminum Nitride (TiAlN) Coated
				0-80	9/32"	1 5/8"	UNF	2	3/64"	0.0469"	Square	0000000	000000	———	0
				2-56	7/16"	1 3/4"	UNC	2	51 Ga.	0.067"	Square	0000000	00000	0000000	000000
				4-40	5/16"	1 7/8"	UNC	2	43 Ga.	0.089"	Square	0000000	00000	0000000	00000
				6-32	3/8"	2"	UNC	3	36 Ga.	0.1065"	Square	0000000	00000	0000000	00000
				8-32	3/8"	2 1/8"	UNC	4	29 Ga.	0.136"	Square	0000000	00000	0000000	00000
				10-24	1/2"	2 3/8"	UNC	4	25 Ga.	0.1495"	Square	0000000	00000	0000000	00000
				10-32	1/2"	2 3/8"	UNF	4	21 Ga.	0.159"	Square	0000000	00000	0000000	00000
				1/4"-20	5/8"	2 1/2"	UNC	4	7 Ga.	0.201"	Square	0000000	000000	0000000	000000
				1/4"-28	5/8"	2 1/2"	UNF	4	3 Ga.	0.213"	Square	0000000	000000	0000000	000000
				5/16"-18	11/16"	2 23/32"	UNC	4	F	0.257"	Square	0000000	000000	0000000	000000
				3/8"-16	3/4"	2 15/16"	UNC	4	5/16"	0.3125"	Square	0000000	000000	0000000	000000
				1/2"-13	15/16"	3 3/8"	UNC	4	27/64"	0.4219"	Square	0000000	000000	0000000	000000
				9/16"-12	1"	3 19/32"	UNC	4	31/64"	0.4844"	Square	0000000	000000	———	0
				5/8"-11	1 1/16"	3 13/16"	UNC	4	17/32"	0.5313"	Square	0000000	000000	0000000	000000
				3/4"-10	1 7/32"	4 1/4"	UNC	4	21/32"	0.6563"	Square	0000000	000000	0000000	000000
				3/4"-16	1 7/32"	4 1/4"	UNF	4	11/16"	0.6875"	Square	0000000	000000	———	0
				M3 × 0.5 mm	5/16"	1 15/16"	Metric	3	2.5 mm	0.0984"	Square	0000000	00000	0000000	00000
				M4 × 0.7 mm	3/8"	2 1/8"	Metric	4	3.3 mm	0.1299"	Square	0000000	00000	0000000	00000
				M5 × 0.8 mm	1/2"	2 3/8"	Metric	4	4.2 mm	0.1654"	Square	0000000	00000	0000000	00000
				M6 × 1 mm	5/8"	2 1/2"	Metric	4	5 mm	0.1969"	Square	0000000	000000	0000000	000000
				M8 × 1.25 mm	11/16"	2 23/32"	Metric	4	6.7 mm	0.2638"	Square	0000000	000000	0000000	000000
				M10 × 1.5 mm	1 1/4"	2 31/32"	Metric	4	8.5 mm	0.3346"	Square	0000000	000000	0000000	000000

Chip-Clearing Taps for Aluminum, Brass, and Bronze

Long, gummy strands from soft metals won’t get stuck on the tap or in the hole. With two layers of slippery coating over spiral flutes, these taps prevent chip buildup that can harm the threads and the tap.

Cobalt Steel

Tough and wear resistant, cobalt taps last twice as long as high-speed steel. They also can run at higher temperatures without damage to their cutting edges.

Spiral Flute for Through Holes—Left-hand flutes push chips ahead of the tap and out of through holes.

Spiral Flute for Blind Holes—Pull chips back toward the tap so they won't build up in blind holes.

					Drill Bit			Spiral Flute for Through Holes			Spiral Flute for Blind Holes
	Thread Size	Thread Lg.	Overall Lg.	Thread Type	Size	Decimal Size Equiv.	Shank Type	No. of Flutes		Each	No. of Flutes		Each
Plug Chamfer



		Spiral Flute for Through Holes

				Titanium Nitride (TiN) Coated/Chromium Carbide (CrC) Coated
				2-56	5/16"	1 49/64"	UNC	51 Ga.	0.067"	Square	2	0000000	000000	—	———	0
				4-40	5/16"	2 13/64"	UNC	43 Ga.	0.089"	Square	2	0000000	00000	—	———	0
				5-40	5/16"	2 13/64"	UNC	38 Ga.	0.1015"	Square	2	0000000	00000	—	———	0
				6-32	11/32"	2 13/64"	UNC	36 Ga.	0.1065"	Square	2	0000000	00000	—	———	0
				8-32	7/16"	2 31/64"	UNC	29 Ga.	0.136"	Square	2	0000000	00000	—	———	0
				10-24	15/32"	2 49/64"	UNC	25 Ga.	0.1495"	Square	2	0000000	00000	—	———	0
				10-32	15/32"	2 49/64"	UNF	21 Ga.	0.159"	Square	2	0000000	00000	—	———	0
				1/4"-20	19/32"	3 5/32"	UNC	7 Ga.	0.201"	Square	2	0000000	00000	—	———	0
				1/4"-28	19/32"	3 5/32"	UNF	3 Ga.	0.213"	Square	2	0000000	00000	—	———	0
				5/16"-18	19/32"	3 35/64"	UNC	F	0.257"	Square	2	0000000	00000	—	———	0
				5/16"-24	19/32"	3 35/64"	UNF	I	0.272"	Square	2	0000000	00000	—	———	0
				3/8"-16	3/4"	3 15/16"	UNC	5/16"	0.3125"	Square	2	0000000	00000	—	———	0
				7/16"-14	23/32"	3 15/16"	UNC	U	0.368"	Square	3	0000000	00000	—	———	0
				7/16"-20	23/32"	3 15/16"	UNF	25/64"	0.3906"	Square	3	0000000	00000	—	———	0
				1/2"-13	29/32"	4 21/64"	UNC	27/64"	0.4219"	Square	3	0000000	00000	—	———	0
				1/2"-20	29/32"	4 21/64"	UNF	29/64"	0.4531"	Square	3	0000000	00000	—	———	0
				M3 × 0.5 mm	5/16"	2 13/64"	Metric	2.5 mm	0.0984"	Square	2	0000000	00000	—	———	0
				M3.5 × 0.6 mm	11/32"	2 13/64"	Metric	2.9 mm	0.1142"	Square	2	0000000	00000	—	———	0
				M4 × 0.7 mm	7/16"	2 31/64"	Metric	3.3 mm	0.1299"	Square	2	0000000	00000	—	———	0
				M5 × 0.8 mm	15/32"	2 49/64"	Metric	4.2 mm	0.1654"	Square	2	0000000	00000	—	———	0
				M6 × 1 mm	15/32"	3 5/32"	Metric	5 mm	0.1968"	Square	2	0000000	00000	—	———	0
				M7 × 1 mm	19/32"	3 35/64"	Metric	6 mm	0.2362"	Square	2	0000000	00000	—	———	0
				M8 × 1.25 mm	19/32"	3 35/64"	Metric	6.7 mm	0.2638"	Square	2	0000000	00000	—	———	0
				M10 × 1.25 mm	23/32"	3 15/16"	Metric	8.7 mm	0.3425"	Square	2	0000000	00000	—	———	0
				M10 × 1.5 mm	23/32"	3 15/16"	Metric	8.5 mm	0.3346"	Square	2	0000000	00000	—	———	0
				M12 × 1.25 mm	27/32"	4 21/64"	Metric	10.8 mm	0.4251"	Square	3	0000000	00000	—	———	0
				M12 × 1.5 mm	27/32"	4 21/64"	Metric	10.5 mm	0.4133"	Square	3	0000000	00000	—	———	0
				M12 × 1.75 mm	27/32"	4 21/64"	Metric	10.2 mm	0.4016"	Square	3	0000000	00000	—	———	0

				Bottoming Chamfer



						Spiral Flute for Blind Holes

								Titanium Nitride (TiN) Coated/Chromium Carbide (CrC) Coated
								2-56	5/16"	1 49/64"	UNC	51 Ga.	0.067"	Square	—	———	0	3	0000000	000000
								4-40	5/16"	2 13/64"	UNC	43 Ga.	0.089"	Square	—	———	0	3	0000000	00000
								5-40	5/16"	2 13/64"	UNC	38 Ga.	0.1015"	Square	—	———	0	3	0000000	00000
								6-32	11/32"	2 13/64"	UNC	36 Ga.	0.1065"	Square	—	———	0	3	0000000	00000
								8-32	7/16"	2 31/64"	UNC	29 Ga.	0.136"	Square	—	———	0	3	0000000	00000
								10-24	15/32"	2 49/64"	UNC	25 Ga.	0.1495"	Square	—	———	0	3	0000000	00000
								10-32	15/32"	2 49/64"	UNF	21 Ga.	0.159"	Square	—	———	0	3	0000000	00000
								1/4"-20	19/32"	3 5/32"	UNC	7 Ga.	0.201"	Square	—	———	0	3	0000000	00000
								1/4"-28	19/32"	3 5/32"	UNF	3 Ga.	0.213"	Square	—	———	0	3	0000000	00000
								5/16"-18	19/32"	3 35/64"	UNC	F	0.257"	Square	—	———	0	3	0000000	00000
								3/8"-16	3/4"	3 15/16"	UNC	5/16"	0.3125"	Square	—	———	0	3	0000000	00000
								1/2"-13	29/32"	4 21/64"	UNC	27/64"	0.4219"	Square	—	———	0	3	0000000	00000
								M3 × 0.5 mm	5/16"	2 13/64"	Metric	2.5 mm	0.0984"	Square	—	———	0	3	0000000	00000
								M4 × 0.7 mm	7/16"	2 31/64"	Metric	3.3 mm	0.1299"	Square	—	———	0	3	0000000	00000
								M5 × 0.8 mm	15/32"	2 49/64"	Metric	4.2 mm	0.1654"	Square	—	———	0	3	0000000	00000
								M6 × 1 mm	15/32"	3 5/32"	Metric	5 mm	0.1968"	Square	—	———	0	3	0000000	00000
								M10 × 1.5 mm	23/32"	3 15/16"	Metric	8.5 mm	0.3346"	Square	—	———	0	3	0000000	00000
								M12 × 1.5 mm	27/32"	4 21/64"	Metric	10.5 mm	0.4133"	Square	—	———	0	3	0000000	00000
								M12 × 1.75 mm	27/32"	4 21/64"	Metric	10.2 mm	0.4016"	Square	—	———	0	3	0000000	00000

Thread Mills

Cut a range of thread sizes with a single tool. These thread mills can also produce both right-hand and left-hand threads. All are made of solid carbide with an aluminum-titanium-nitride (AlTiN) coating, so they have high strength and excellent wear resistance, even when cutting hard and abrasive material. Use them in a CNC machine that allows helical interpolation.

When used for internal threading, thread mills can create threads of any size equal to or greater than the minimum size listed. They leave space in the hole for chips to fall, and a broken thread mill can fall into the hole without damaging the workpiece.

For Internal Threads (UNC, UNEF, UNF, UNJ, UNS)

Image of ProductInUse. Front orientation. Thread Mills. For Internal Threads.

Thread mills cut internal UNC, UNEF, UNF, UNJ, or UNS threads, but the threads they create have a fixed pitch.

	Threads per In.	Thread Lg.	Overall Lg.	No. of Flutes	Shank Size		Each
Aluminum Titanium Nitride (AlTiN)-Coated Carbide


	No. 4	40	3/16"	2 1/2"	2	1/4"	0000000	0000000
	No. 6	32	17/64"	2 1/2"	3	1/4"	0000000	000000
	No. 8	32	17/64"	2 1/2"	3	1/4"	0000000	000000
	No. 10	24	11/32"	2 1/2"	3	1/4"	0000000	000000
	No. 10	32	21/64"	2 1/2"	3	1/4"	0000000	000000
	1/4"	20	33/64"	2 1/2"	3	1/4"	0000000	000000
	5/16"	18	5/8"	2 1/2"	3	1/4"	0000000	000000
	3/8"	16	25/32"	3"	4	5/16"	0000000	000000
	1/2"	13	7/8"	3"	4	3/8"	0000000	000000

For Internal Threads (Metric)

Thread mills cut internal metric threads, but the threads they create have a fixed pitch.

	Thread Pitch, mm	Thread Lg.	Overall Lg.	No. of Flutes	Shank Size		Each
Aluminum Titanium Nitride (AlTiN)-Coated Carbide


	M5	0.8	21/64"	2 9/32"	3	0.2362"	0000000	0000000
	M6	1	31/64"	2 9/32"	3	0.2362"	0000000	000000
	M8	1.25	21/32"	2 9/32"	3	0.2362"	0000000	000000

For Internal/External Threads (UNC, UNEF, UNF, UNS) and Internal Threads (UNJ)

Image of ProductInUse. Front orientation. Thread Mills. For External Threads, For Internal Threads.

Thread mills have a single cutting point that cuts internal/external UNC, UNEF, UNF, or UNS threads in a range of different pitches on both the inside and outside of the workpiece. They can also cut internal UNJ threads in a range of different pitches.

	Threads per In.	Overall Lg.	Shank Size	Neck Dia.		Each
Aluminum Titanium Nitride (AlTiN)-Coated Carbide


	No. 2	56 to 80	1 1/2"	1/8"	0.034"	0000000	000000
	No. 4	40 to 64	2"	3/16"	0.045"	0000000	00000
	No. 6	32 to 64	2"	3/16"	0.049"	0000000	00000
	No. 8	32 to 56	2"	3/16"	0.07"	0000000	00000
	No. 10	24 to 56	2"	3/16"	0.075"	0000000	00000
	No. 12	24 to 56	2"	3/16"	0.08"	0000000	00000
	1/4"	18 to 56	2 1/2"	1/4"	0.104"	0000000	00000
	5/16"	16 to 48	2 1/2"	1/4"	0.153"	0000000	00000
	3/8"	14 to 40	3"	3/8"	0.192"	0000000	00000
	1/2"	12 to 32	3"	3/8"	0.24"	0000000	00000

Drill Out Tap Extractor Sets for Screw Thread Taps

After using a large-diameter bit to drill a starter hole in a broken tap, drill out the tap with one of these tools. Sets include multiple extractors for use with different tap sizes and two picks for removing the remains.

No. of Pieces	Includes	For Tap Size	Overall Lg.	OD	Material	Container Type		Each
7	Four Tap Extractors, Pin Vise, Two Picks	No. 4, No. 5, No. 6, No. 8, No. 10, No. 12, 1/4", 5/16", 3/8", 7/16", 1/2", M3, M3.5, M4, M5, M6, M7, M8, M10, M12	1 1/4" 1 1/2" 2" 2 1/2"	1/8" 5/64" 3/16" 1/4"	Carbide	Plastic Case	0000000	0000000

Drill Out Tap Extractors for Screw Thread Taps

After using a large-diameter bit to drill a starter hole in a broken tap, drill out the tap with one of these tools. Remove the remains with a scriber or pick.

For Tap Size	OD	Overall Lg.	Material	Each
No. 4, No. 5, No. 6, M3, M3.5	5/64"	1 1/4"	Carbide	000000
No. 8, No. 10, No. 12, M4, M5	1/8"	1 1/2"	Carbide	00000
1/4", 5/16", M6, M7	3/16"	2"	Carbide	00000
5/16", 3/8", 7/16", 1/2", M8, M10, M12	1/4"	2 1/2"	Carbide	00000

Friction Drill Bits for Tapping Sheet Metal

Pair these bits with a friction drill and a collet (sold separately) and mount on a drill press, milling machine, or CNC machine to use friction heat to melt through sheet metal and quickly produce a hole with a lip. The lip that is formed is approximately three times the material thickness.

Friction Drill Bits								Friction Drill Collets
For Hole Thread Size	Dia.	Shank Dia., mm	For Material Thk. Range	Min. Rotation Speed, rpm	Material		Each		Each
6-32	0.12"	6	0.0394" to 0.0591"	2,300	Tungsten Carbide	0000000	000000	00000000	000000
8-32	0.15"	6	0.0394" to 0.0591"	2,200	Tungsten Carbide	0000000	00000	00000000	00000
10-24	0.17"	6	0.0394" to 0.0787"	2,100	Tungsten Carbide	0000000	00000	00000000	00000
1/4"-20	0.22"	8	0.0394" to 0.0787"	2,000	Tungsten Carbide	0000000	00000	00000000	00000
5/16"-18	0.28"	8	0.0394" to 0.0984"	1,600	Tungsten Carbide	0000000	000000	00000000	00000
3/8"-16	0.34"	10	0.0394" to 0.0984"	1,500	Tungsten Carbide	0000000	000000	00000000	00000
1/2"-13	0.46"	14	0.0339" to 0.1181"	1,300	Tungsten Carbide	0000000	000000	00000000	00000