|
Pipe
Engagement
Length
of Thread on Pipe to Make a Tight Joint
|
|
Nominal
Pipe Size
(Inches)
|
Dimension
A
(Inches)
|
Nominal
Pipe Size
(Inches)
|
Dimension
A
(Inches)
|
|
1/8
|
¼
|
1
– ½
|
11/16
|
|
¼
|
3/8
|
2
|
¾
|
|
3/8
|
3/8
|
2
– ½
|
15/16
|
|
½
|
½
|
3
|
1
|
|
¾
|
9/16
|
4
|
1
– 1/8
|
|
1
|
11/16
|
5
|
1
– ¼
|
|
1
– ¼
|
11/16
|
6
|
1
– 5/16
|
|
Dimensions
do not allow for variation in tapping or threading
|
Drill Sizes for Pipe Taps
|
Nominal
Pipe Size
(Inches)
|
Tap
Drill Size
(Inches)
|
Nominal
Pipe Size
(Inches)
|
Tap
Drill Size
(Inches)
|
|
1/8
|
11/32
|
1
– ½
|
1
– 23/32
|
|
¼
|
7/16
|
2
|
2
– 3/16
|
|
3/8
|
19/32
|
2
– ½
|
2
– 9/16
|
|
½
|
23/32
|
3
|
3
– 3/16
|
|
¾
|
15/16
|
4
|
4
– 3/16
|
|
1
|
1
– 5/32
|
5
|
5
– 5/16
|
|
1
– ¼
|
1
- ½
|
6
|
6
– 5/16
|
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