Comparison table of inch threads

 

Nominal diameter  BSW (W) UNC UNF UNEF BSF Thread diameter    Nominal diameter  BSP (G) Thread diameter 
Inch TPI TPI TPI TPI TPI mm   Inch TPI mm
No. 0 - - 80 - - 1,520   G 1/8" 28 9,728
No. 1 - 64 72 - - 1,850   G 1/4" 19 13,157
No. 2 - 56 64 - - 2,180   G 3/8" 19 16,662
No. 3 - 48 56 - - 2,520   G 1/2" 14 20,955
No. 4 - 40 48 - - 2,850   G 5/8" 14 22,911
No. 5 - 40 44 - - 3,170   G 3/4" 14 26,441
No. 6 - 32 40 - - 3,500   G 7/8" 14 30,201
No. 8 - 32 36 - - 4,160   G 1" 11 33,249
No. 10 - 24 32 - - 4,830   G 1 1/8" 11 37,897
No. 12 - 24 28 32 - 5,490   G 1 1/4" 11 41,910
1/16" 60 - - - - 1,587   G 1 3/8" 11 44,323
3/32" 48 - - - - 2,381   G 1 1/2" 11 47,803
1/8" 40 - - - - 3,175   G 1 3/4" 11 53,746
5/32" 32 - -     3,969   G 2" 11 59,614
3/16" 24 - - - 32 4,762   G 2 1/4" 11 65,710
7/32" 24 - - - 28 5,556   G 2 1/2" 11 75,184
1/4" 20 20 28 32 26 6,350   G 2 3/4" 11 81,534
5/16" 18 18 24 32 22 7,938   G 3" 11 87,884
3/8" 16 16 24 32 20 9,525   G 3 1/4" 11 93,980
7/16" 14 14 20 28 18 11,113   G 3 1/2" 11 100,330
1/2" 12 13 20 28 16 12,700   G 3 3/4" 11 106,680
9/16" 12 12 18 24 16 14,288   G 4" 11 113,030
5/8" 11 11 18 24 14 15,876        
11/16" - - - 24 14 17,463        
3/4" 10 10 16 20 12 19,051        
13/16" - - - 20 12 20,638        
7/8" 9 9 14 20 11 22,226        
15/16" - - - 20 11 23,813        
1" 8 8 12 20 10 25,401        
11/16" - - - 18 - 26,988        
11/8" 7 7 12 18 9 28,576        
13/16" - - - 18 - 30,163        
11/4" 7 7 12 18 9 31,751        
15/16" - - - 18 - 33,338        
13/8" 6 6 12 18 8 34,926        
17/16" - - - 18 - 36,512        
11/2" 6 6 12 1 8 38,101        
15/8" 5 5 - 18 8 41,277        
13/4" 5 5 - 18 7 44,452        
17/8" 4,5 4,5 - 18 - 47,627        
2" 4,5 4,5 - 18 7 50,802        
2 1/4" 4 4,5 - - - 57,152        
2 1/2" 4 4 - - - 63,502        
2 3/4" 3,5 4 - - - 69,853        
3" 3,5 4 - - - 76,203