3/8 NPTF Taps | McMaster-Carr

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	Pipe Size Pipe Size	Show

3/8

	Pipe Size Pipe Size	Hide

	Thread Type Thread Type	Show

NPTF

	Thread Type Thread Type	Hide

	For Use On For Use On

	Thread Direction Thread Direction


Right Hand	Left Hand

	Flute Type Flute Type

	Straight
	Spiral

	Application Application

Through-Hole Threading

Closed-End Hole Threading

	Threads Per Inch Threads Per Inch

	Number of Flutes Number of Flutes

	Material Material

High-Speed Steel

Cobalt Steel

	Finish Finish

Uncoated

Titanium Nitride (TiN) Coated

	Drill Bit Size Drill Bit Size

9/16"

	Shank Type Shank Type

	Square

	Individual/Set Individual/Set

Individual

	Number of Tapping Ends Number of Tapping Ends

	Drill Bit Decimal Size Equivalent Drill Bit Decimal Size Equivalent

0.5625"

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	Thread Length Thread Length

1 1/16"

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Maximum Tapping Depth Maximum Tapping Depth

1 1/16"

	Overall Length Overall Length

2 9/16"

3 1/2"

3 3/4"

	Chamfer Type Chamfer Type

Plug

	Pitch Diameter Limit Pitch Diameter Limit

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9 Products

Pipe and Conduit Thread Taps

Plug Chamfer

Create threads sized for pipe and conduit. For use on most metal and plastic, these high-speed steel taps are durable enough for small-scale tapping jobs, but they're not recommended for production use. They have a square shank that's compatible with tap wrenches and tap holders for drill presses and milling machines.

Uncoated taps are strong enough for most tapping jobs but have the shortest tool life. Titanium-nitride (TiN) coated taps resist heat and wear better than uncoated taps, letting them last up to twice as long.

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. When using them to tap closed-end holes, be sure to leave sufficient space at the bottom for chips to accumulate.

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

NPT and NPTF

					Drill Bit			Plug Chamfer
Pipe Size	Thread Type	Threads Per Inch	Thread Lg.	Overall Lg.	Size	Decimal Size Equivalent	No. of Flutes		Each
Uncoated High-Speed Steel
3/8	NPTF	18	1 1/16"	2 9/16"	9/16"	0.5625"	4	00000000	000000
3/8	NPTF	18	1 1/16"	3 3/4"	9/16"	0.5625"	4	0000000	00000
Titanium Nitride (TiN) Coated High-Speed Steel
3/8	NPTF	18	1 1/16"	2 9/16"	9/16"	0.5625"	4	0000000	00000

Long-Reach Pipe and Conduit Thread Taps

Plug Chamfer

With an extra-long shank, these taps have extended reach for tapping deep and hard-to-reach areas in pipe and conduit. They're made of high-speed steel and are for use on most metal and plastic. The square shank is compatible with tap wrenches and tap holders for drill presses and milling machines.

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

					Drill Bit			Plug Chamfer
Pipe Size	Thread Type	Threads Per Inch	Thread Lg.	Overall Lg.	Size	Decimal Size Equivalent	No. of Flutes		Each
Uncoated High-Speed Steel
3/8	NPTF	18	1 1/16"	6"	9/16"	0.5625"	4	0000000	000000

Left-Hand Pipe and Conduit Thread Taps

Tap left-hand threads for pipe and conduit. For use on most metal and plastic, these high-speed steel taps are durable enough for small-scale tapping jobs, but they're not recommended for production use. The square shank is compatible with tap wrenches and 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. When using them to tap closed-end holes, be sure to leave sufficient space at the bottom for chips to accumulate.

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

					Drill Bit			Plug Chamfer
Pipe Size	Thread Type	Threads Per Inch	Thread Lg.	Overall Lg.	Size	Decimal Size Equivalent	No. of Flutes		Each
Uncoated High-Speed Steel
3/8	NPTF	18	1 1/16"	2 9/16"	9/16"	0.5625"	4	00000000	000000

Chip-Clearing Pipe and Conduit Thread Taps

Also known as interrupted-thread taps, these have extra space between the cutting threads, so large chips fall without packing and high amounts of lubricant can flow between the tap and the workpiece. Made of uncoated high-speed steel, these taps are for use on most metal and plastic. Their square shank is compatible with tap wrenches and 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. When using them to tap closed-end holes, be sure to leave sufficient space at the bottom for chips to accumulate.

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

					Drill Bit			Plug Chamfer
Pipe Size	Thread Type	Threads Per Inch	Thread Lg.	Overall Lg.	Size	Decimal Size Equivalent	No. of Flutes		Each
Uncoated High-Speed Steel
3/8	NPTF	18	1 1/16"	2 9/16"	9/16"	0.5625"	5	00000000	000000

Combination Drill Bit/Pipe and Conduit Thread Taps

Drill and thread holes for pipe and conduit without switching tools. Made of uncoated high-speed steel, these tools are for use on most metal and plastic. Their right-hand spiral flutes keep chips clear by drawing them back toward the tap and out of the hole. With a square shank, they're compatible with tap wrenches and 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 of through holes.

					Drill Bit				Plug Chamfer
Pipe Size	Thread Type	Threads Per Inch	Thread Lg.	Overall Lg.	Size	Decimal Size Equivalent	Point Angle	No. of Flutes		Each
Uncoated High-Speed Steel
3/8	NPTF	18	1 1/16"	3 1/2"	9/16"	0.5625"	118°	4	0000000	0000000

Pipe and Conduit Thread Taps for Stainless Steel and Plastic

The spiral flutes on these pipe and conduit taps keep chips clear by drawing them back out of the hole, so there's no need to reverse the tap while cutting threads. All have a square shank, so they're compatible with tap wrenches and tap holders for drill presses and milling machines.

Titanium-nitride (TiN) coated cobalt steel taps can cut threads in plastic and stainless steel. They resist heat and wear better than high-speed steel taps, letting them last up to twice as long. All have a plug chamfer with 3-5 chamfered cutting threads, so they require moderate torque and are good for start-to-finish tapping.

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

Titanium-Nitride (TiN) Coated Cobalt Steel

Plug Chamfer

					Drill Bit			Plug Chamfer
Pipe Size	Thread Type	Threads Per Inch	Thread Lg.	Overall Lg.	Size	Decimal Size Equivalent	No. of Flutes		Each
3/8	NPTF	18	1 1/16"	2 9/16"	9/16"	0.5625"	4	0000000	000000

Pipe and Conduit Thread Taps for Aluminum, Copper, and Brass

The cutting teeth are shaped to cut smooth threads in soft pipe and conduit material. With a square shank, these taps are compatible with tap wrenches and tap holders for drill presses and milling machines. All have a plug chamfer with 3-5 cutting threads, so they're suitable for start-to-finish tapping. When using them to tap closed-end holes, be sure to leave sufficient space at the bottom for chips to accumulate.

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

					Drill Bit			Plug Chamfer
Pipe Size	Thread Type	Threads Per Inch	Thread Lg.	Overall Lg.	Size	Decimal Size Equivalent	No. of Flutes		Each
Uncoated High-Speed Steel
3/8	NPTF	18	1 1/16"	2 9/16"	9/16"	0.5625"	4	0000000	000000