Thread standards

Here you will find an overview of the most frequently used thread standards. The appropriate outside diameter and pitch are also indicated for the thread size.

Thread metric

M thread acc. to EN 60423, IEC 423 or BS 6053 ISO 68, DIN 13
M O.D. Pitch
8 8 1
10 10 1
12 12 1,5
16 16 1,5
20 20 1,5
25 25 1,5
32 32 1,5
40 40 1,5
50 50 1,5
63 63 1,5

Thread PG

PG thread acc. to DIN 40430
 
PG O.D. Pitch
7 12,5 1,27
9 15,2 1,41
11 18,6 1,41
13,5 20,4 1,41
16 22,5 1,41
21 28,3 1,588
29 37,0 1,588
36 47,0 1,588
42 54,0 1,588
48 59,3 1,588

Thread UNEF

UNEF thread acc. to ANSI/ASME B 1.1
UNEF O.D. Pitch
1/2"-2812,7 12,7 0,9070
5/8"-24 15,875 1,0580
3/4"-20 19,050 1,2700
7/8"-20 22,225 1,2700
15/16"-20 23,813 1,2700
1"-20 25,400 1,2700
1 3/16"-18 30,163 1,4110
1 7/16"-18 36,513 1,4110
1 3/4"-18 44,450 1,7205
2"-18 50,800 1,9706

Thread Whitworth-R

G thread acc. To JIS B 0204, DIN ISO 2289-1 or BS 2779
CTG R O.D. Pitch
  1/4" 13,16 1,340
G 16 1/2" 20,96 1,810
G 22 3/4" 26,44 1,810
G 28 1" 33,25 2,310
G 36 1 1/4" 41,91 2,208
G 42 1 1/2" 47,80 2,310
G 54 2" 59,61 2,310

Thread NPT

NPT thread acc. to ANSI/ASME B 1.20.1
NPT O.D. Pitch
1/4" 13,716 1,411
3/8" 17,145 1,411
1/2" 21,336 1,814
3/4" 26,670 1,814
1" 33,401 2,208
1 1/4" 42,164 2,208
1 1/2" 48,260 2,208
2" 60,325 2,208