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4300 Catalog
General Technical
U31
Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
http://www.parker.com/tfd
Dimensions and pressures for reference only, subject to change.
NPTF and BSPT Dimensions
Male NPTF
Female NPTF
Table U22 — NPTF Dimensions
1) For bottoming taps only.
Table U23 — BSPT Dimensions
1) For bottoming taps only.
Male BSPT
Female BSPT
Thread
Size
NPTF
O.D.
Male Thread
Large Dia.
D Min.
Thread
Length
B Min.
Tap Drill
Depth
1)
E
Chmf.
Dia.
1/8-27
0.41
0.31
0.38
0.42
1/4-18
0.55
0.44
0.47
0.55
3/8-18
0.68
0.47
0.53
0.69
1/2-14
0.85
0.59
0.69
0.85
3/4-14
1.06
0.63
0.75
1.06
1-11 1/2
1.33
0.75
0.84
1.34
1 1/4-11 1/2
1.67
0.78
0.84
1.68
1 1/2-11 1/2
1.91
0.81
0.88
1.92
2-11 1/2
2.39
0.81
0.91
2.39
Thread
Size
BSPT
O.D.
Male Thread
Large Dia.
D Min.
Thread
Length
B Min.
Tap Drill
Depth
1)
E
Chmf.
Dia.
1/8-28
0.39
0.31
0.38
0.42
1/4-19
0.53
0.44
0.47
0.55
3/8-19
0.67
0.47
0.53
0.69
1/2-14
0.84
0.59
0.69
0.85
3/4-14
1.06
0.63
0.75
1.06
1-11
1.33
0.75
0.84
1.34
1 1/4-11
1.67
0.78
0.84
1.68
1 1/2-11
1.90
0.81
0.88
1.92
2-11
2.37
0.81
0.91
2.39