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HSS NPT Tap

The nominal size of a High Speed Steel Taper Pipe Tap (NPT) is that of the pipe fitting to be tapped, not the actual size of the tap. They are for general use in production tapping or hand operations in a wide range of application material groups.

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Dimensional Specifications
Tap Drill Chart

Tap Drill Chart

Tap Size	Drill Size	Probable % Thread
M3-0.5	40	70-79
5-40	38	65-72
5-44	37	63-71
M3.5-0.6	33	72-81
6-32	36	71-78
6-40	33	69-77
M4-0.7	3.25 mm	74-82
8-32	29	62-69
8-36	29	70-78
10-24	25	69-75
10-32	21	68-76
M5-0.8	4.2 mm	69-77
12-24	16	66-72
12-28	15	70-78
M6-1.0	10	76-84
1/4-20	7	70-75
1/4-28	3	72-80
5/16-18	F	72-77
5/16-24	I	67-75
M8-1.25	6.7 mm	74-80
3/8-16	5/16	72-77
3/8-24	Q	71-79
M10-1.50	8.4 mm	76-82
7/16-14	U	70-75
7/16-20	25/64	65-72
M12-1.75	13/32	69-74
1/2-13	27/64	73-78
1/2-20	29/64	65-72

Tap Size	Drill Size	Probable % Thread
M14-2.0	15/32	76-81
9/16-12	31/64	68-72
9/16-18	33/64	58-65
5/8-11	17/32	75-79
5/8-18	37/64	58-65
M16-2.0	35/64	76-81
3/4-10	21/32	68-72
3/4-16	11/16	71-77
M20-2.5	11/16	74-78
7/8-9	49/64	72-76
7/8-14	13/16	62-67
M24-3.0	53/64	72-76
1-8	7/8	73-77
1-12	59/64	67-72
1-14	15/16	61-67
1-1/8-7	63/64	72-76
1-1/8-8	1	76
1-1/8-12	1-3/16	66-72
M30-3.5	1-3/64	75
1-1/4-7	1-7/64	76
1-1/4-8	1-1/8	76
1-1/4-12	1-11/64	72
1-3/8-6	1-7/32	72
1-3/8-12	1-19/64	72
M36-4.0	1-1/4	82
1-1/2-6	1-11/32	72
1-1/2-8	1-3/8	76
1-1/2-12	1-27/64	72

NPT Tap Size	Taper Pipe Drill Size	Straight Pipe Drill Size
1/8-27	R	11/32
1/4-18	7/16	7/16
3/8-18	37/64	37/64
1/2-14	45/64	23/32
3/4-14	59/64	59/64
1-11.5	1-5/32	1-5/32
1-1/4-11.5	1-31/64	1-1/2
1-1/2-11.5	1-47/64	1-3/4
2-11.5	2-7/32	2-7/32

HSS NPT Tap

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Size Thread Pitch Tap Type Item # Availability Price Quantity UOM

NPT

TAPS100-NPT

In Stock

$174.76548/EA

See Quantity Discounts

1-11.5 HIGH SPEED STEEL PIPE TAP

$174.76548/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$174.76548/ EA

1 1/4

NPT

TAPS125-NPT

In Stock

$246.55588/EA

See Quantity Discounts

1 1/4-11.5 HIGH SPEED STEEL PIPE TAP

$246.55588/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$246.55588/ EA

1 1/2

NPT

TAPS150-NPT

In Stock

$331.43929/EA

See Quantity Discounts

1 1/2-11.5 HIGH SPEED STEEL PIPE TAP

$331.43929/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$331.43929/ EA

NPT

TAPS200-NPT

In Stock

$448.64648/EA

See Quantity Discounts

2-11.5 HIGH SPEED STEEL PIPE TAP

$448.64648/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$448.64648/ EA

HSS NPT Tap

Technical Data

Dimensional Specifications

Dimensional SpecificationsHSS NPT Tap

Tap Drill Chart

Tap Drill Chart

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Size

Thread Pitch

Overall Length

1-11.5 HIGH SPEED STEEL PIPE TAP

1 1/4-11.5 HIGH SPEED STEEL PIPE TAP

1 1/2-11.5 HIGH SPEED STEEL PIPE TAP

2-11.5 HIGH SPEED STEEL PIPE TAP

Tap Size	Thread	Overall Length	Length of Thread	Number of Flutes
1/16	27	2 1/8	11/16	4
1/8	27	2 1/8	3/4	4
1/4	18	2 7/16	1 1/16	4
3/8	18	2 9/16	1 1/16	4
1/2	14	3 1/8	1 3/8	4
3/4	14	3 1/4	1 3/8	5
1	11 1/2	3 3/4	1 3/4	5
1 1/4	11 1/2	4	1 3/4	5
1 1/2	11 1/2	4 1/4	1 3/4	7
2	11 1/2	4 1/4	1 3/4	7
2 1/2	8	5 1/2	2 9/16	8
3	8	6	2 5/8	8
3 1/2	8	6 1/2	2 11/16	8
4	8	6 3/4	2 3/4	8