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NPT Thread chart

PIPE
FITTING
PIPE SIZE INCH AIR HYDR. THREAD O.D (mm) PIPE I.D (mm)
 6A  1/8″  01  01  10.5  6
8A 1/4″ 02 02 13.8 8
10A 3/8″ 03 04 17.3 10
15A 1/2″ 04 04 21.7 15
20A 3/4″ 06 06 27.2 20
25A 1″ 10 08 34 25
32A 1-1/4″ 12 10 42.7 32
40A 1-1/2″ 14 12 48.6 40
50A 2″ 20 16 60.5 50
65A 2-1/2″ 20 76.3 65
80A 3″ 24 89.1 80
100A 4″ 32 114.3 100
125A 5″ 40 139.8 125