Size mm | Pitch mm | Tapping Drill Sizes | |||
---|---|---|---|---|---|
Preferred | Alternative | ||||
mm | Inch | mm | Inch | ||
8.0 | 1.00 | 7.1 | 9/32 | 7.0 | |
10.0 | 1.25 | 8.9 | 8.8 | 11/32 | |
12.0 | 1.25 | 27/64 | 10.8 | ||
12.0 | 1.50 | 27/64 | 10.5 | ||
14.0 | 1.50 | 1/2 | 12.5 | ||
16.0 | 1.50 | 14.75 | 37/64 | 14.5 | |
18.0 | 1.50 | 21/32 | 16.5 | ||
20.0 | 1.50 | 47/64 | 18.5 | ||
22.0 | 1.50 | 13/16 | 20.5 | ||
24.0 | 2.00 | 7/8 | 22.0 |
Size mm | Pitch mm | Tapping Drill Sizes | |||
---|---|---|---|---|---|
Preferred | Alternative | ||||
mm | Inch | mm | Inch | ||
2.0 | 0.40 | 1.6 | 1.6 | 1/16 | |
2.5 | 0.45 | 2.1 | 2.05 | ||
3.0 | 0.50 | 2.55 | 2.5 | ||
3.5 | 0.60 | 2.95 | 2.9 | ||
4.0 | 0.70 | 3.4 | 3.3 | ||
4.5 | 0.75 | 3.8 | 3.7 | ||
5.0 | 0.80 | 4.3 | 11/64 | 4.2 | |
6.0 | 1.00 | 5.1 | 13/64 | 5.0 | |
7.0 | 1.00 | 6.1 | 6.0 | 15/64 | |
8.0 | 1.25 | 6.9 | 6.8 | 17/64 | |
9.0 | 1.25 | 7.9 | 5/16 | 7.8 | |
10.0 | 1.50 | 8.6 | 11/32 | 8.5 | |
11.0 | 1.50 | 9.5 | 3/8 | ||
12.0 | 1.75 | 13/32 | 10.2 | ||
14.0 | 2.00 | 12.2 | 31/64 | 12.0 | 15/32 |
16.0 | 2.00 | 14.25 | 9/16 | 14.0 | 35/64 |
18.0 | 2.50 | 15.75 | 15.5 | 39/64 | |
20.0 | 2.50 | 45/64 | 17.5 | 11/16 | |
22.0 | 2.50 | 25/32 | 19.5 | 49/64 | |
24.0 | 3.00 | 21.0 | 53/64 | ||
27.0 | 3.00 | 61/64 | 24.0 | 15/16 | |
30.0 | 3.50 | 26.5 | 1-3/64 | ||
33.0 | 3.50 | 1-11/64 | 29.5 | 1-5/32 | |
36.0 | 4.00 | 1-17/64 | 32.0 | 1-1/4 |
Size Inch | Threads per Inch | Tapping Drill Sizes | ||||
---|---|---|---|---|---|---|
Preferred | Alternative | |||||
mm | Inch | mm | Inch | |||
No 2 | 56 | 1.85 | 1.8 | |||
No 3 | 48 | 2.1 | 2.05 | 5/64 | ||
No 4 | 40 | 2.35 | 3/32 | 2.3 | ||
No 5 | 40 | 2.65 | 2.6 | |||
No 6 | 32 | 2.85 | 2.8 | 7/64 | ||
No 8 | 32 | 3.5 | 3.4 | |||
No 10 | 24 | 3.9 | 5/32 | 3.8 | ||
No 12 | 24 | 4.5 | 4.4 | 11/64 | ||
1/8* | 40 | 2.65 | 2.6 | |||
5/32* | 32 | 3.3 | 3.1 | 1/8 | ||
3/16* | 24 | 3.8 | 3.7 | |||
7/32* | 24 | 4.6 | 4.5 | |||
1/4 | 20 | 5.2 | 13/64 | 5.1 | ||
5/16 | 18 | 6.6 | 17/64 | 6.5 | 1/4 | |
3/8 | 16 | 8.1 | 8.0 | 5/16 | ||
7/16 | 14 | 9.5 | 3/8 | 23/64 | ||
1/2 | 13 | 11.0 | 10.8 | 27/64 | ||
9/16 | 12 | 12.2 | 31/64 | |||
5/8 | 11 | 13.8 | 35/64 | 13.5 | 17/32 | |
11/16* | 11 | 15.25 | 15.0 | 19/32 | ||
3/4 | 10 | 21/32 | 16.5 | 41/64 | ||
13/16* | 10 | 23/32 | 18.0 | |||
7/8 | 9 | 19.5 | 49/64 | |||
1 | 8 | 7/8 | 22.5 | |||
1-1/8 | 7 | 25.0 | 63/64 | |||
1-1/4 | 7 | 1-7/64 | 28.0 | |||
1-3/8 | 6 | 31.0 | 1-7/32 | 1-13/64 | ||
1-1/2 | 6 | 1-11/32 | 34.0 | 1-21/64 |
Size Inch | Threads per Inch | Tapping Drill Sizes | |||
---|---|---|---|---|---|
Preferred | Alternative | ||||
mm | Inch | mm | Inch | ||
No 5 | 44 | 2.7 | 2.65 | ||
No 6 | 40 | 2.95 | 2.9 | ||
No 8 | 36 | 3.6 | 9/64 | 3.5 | |
No 10 | 32 | 4.1 | 4.0 | 5/32 | |
No 12 | 28 | 4.7 | 4.6 | ||
1/8* | 40 | 2.65 | 2.6 | ||
5/32* | 32 | 3.3 | 3.1 | 1/8 | |
3/16* | 32 | 4.1 | 3.9 | 5/32 | |
7/32* | 32 | 4.9 | 4.8 | 3/16 | |
1/4 | 28 | 5.5 | 7/32 | 5.4 | |
5/16 | 24 | 6.9 | 6.8 | ||
3/8 | 24 | 8.5 | 8.4 | ||
7/16 | 20 | 10.0 | 25/64 | 9.8 | |
1/2 | 20 | 11.5 | 29/64 | ||
9/16 | 18 | 33/64 | 12.8 | ||
5/8 | 18 | 14.5 | 37/64 | ||
11/16* | 16 | 16.0 | 5/8 | 15.75 | |
3/4 | 16 | 17.5 | 11/16 | ||
13/16* | 16 | 3/4 | 19.0 | ||
7/8 | 14 | 13/16 | 20.5 | ||
1 | 12 | 23.5 | 59/64 | ||
1* | 14 | 15/16 | 23.5 | ||
1 1/8 | 12 | 26.5 | 1 3/64 | ||
1 1/4 | 12 | 1 11/64 | 29.5 | ||
1 3/8 | 12 | 33.0 | 1 19/64 | ||
1 1/2 | 12 | 36.0 | 1 27/64 |
Size Inch | Threads per Inch | Tapping Drill Sizes | |||
---|---|---|---|---|---|
Preferred | Alternative | ||||
1/16* | 60 | 1.2 | 3/64 | 1.05 | |
3/32 | 48 | 1.9 | 1.75 | ||
1/8 | 40 | 2.55 | 2.5 | 3/32 | |
5/32* | 32 | 3.2 | 1/8 | 2.95 | |
3/16 | 24 | 3.7 | 3.6 | 9/64 | |
7/32 | 24 | 4.5 | 4.3 | 11/64 | |
1/4 | 20 | 5.1 | 5.0 | 3/16 | |
5/16 | 18 | 6.5 | 6.4 | 1/4 | |
3/8 | 16 | 7.9 | 5/16 | 7.8 | 19/64 |
7/16 | 14 | 9.5 | 9.2 | 23/64 | |
1/2 | 12 | 10.5 | 13/32 | ||
9/16 | 12 | 12 | 15/32 | ||
5/8 | 11 | 13.5 | 17/32 | 33/64 | |
3/4 | 10 | 16.5 | 41/64 | 16.0 | 5/8 |
7/8 | 9 | 3/4 | 19.0 | 47/64 | |
1 | 8 | 22.0 | 55/64 | 27/32 | |
1-1/8 | 7 | 31/32 | 24.5 | 61/64 | |
1-1/4 | 7 | 28.0 | 1-3/32 | 27.5 | 1-5/64 |
1-1/2 | 6 | 33.5 | 1-5/16 | 33.0 | 1-19/64 |
1-3/4 | 5 | 39.0 | 1-17/32 | 38.5 | 1-33/64 |
2 | 41/2 | 44.5 | 1-49/64 | 44.0 | 1-3/4 |
Size | Pitch mm | Tapping Drill Sizes | |||
---|---|---|---|---|---|
Preferred | Alternative | ||||
mm | Inch | mm | Inch | ||
3/16 | 32 | 4.0 | 5/32 | 3.9 | |
1/4 | 26 | 5.3 | 5.2 | 13/64 | |
5/16 | 22 | 6.8 | 17/64 | 6.7 | |
3/8 | 20 | 8.3 | 21/64 | 8.2 | 5/16 |
7/16 | 18 | 9.5 | 3/8 | ||
1/2 | 16 | 7/16 | 11.0 | 27/64 | |
9/16 | 16 | 1/2 | 12.5 | 31/64 | |
5/8 | 14 | 14.0 | 35/64 | 13.8 | 17/32 |
3/4 | 12 | 16.5 | 21/32 | ||
7/8 | 11 | 25/32 | 19.5 | 49/64 | |
1 | 10 | 57/64 | 22.5 | 7/8 | |
1-1/4 | 9 | 28.5 | 1-1/8 | 1-7/64 | |
1-1/2 | 8 | 34.5 | 1-23/64 | 1-11/32 | |
1-3/4 | 7 | 40.5 | 1-19/32 | 40.0 | 1-37/64 |
Size Inch | Threads per Inch | Tapping Drill Sizes | |||
---|---|---|---|---|---|
With Reamer | Without Reamer | ||||
mm | Inch | mm | Inch | ||
1/8 | 28 | 8.0 | 5/16 | 8.4 | 21/64 |
1/4 | 19 | 10.8 | 27/64 | 11.2 | 7/16 |
3/8 | 19 | 14.25 | 9/16 | 14.75 | 37/64 |
1/2 | 14 | 45/64 | 23/32 | ||
3/4 | 14 | 23.0 | 29/32 | 15/16 | |
1 | 11 | 29.0 | 1-9/64 | 30.0 | 1-11/64 |
1-1/4 | 11 | 37.5 | 1-15/32 | 38.5 | 1-33/64 |
1-1/2 | 11 | 43.5 | 1-23/32 | 44.5 | 1-3/4 |
2 | 11 | 2-5/32 | 2-3/16 |
Size Inch | Threads per Inch | Tapping Drill Sizes | |||
---|---|---|---|---|---|
Preferred | Alternative | ||||
mm | Inch | mm | Inch | ||
1/8 | 28 | 8.8 | 8.7 | 11/32 | |
1/4 | 19 | 11.8 | 15/32 | 11.5 | 29/64 |
3/8 | 19 | 15.25 | 15.0 | 19/32 | |
1/2 | 14 | 19.0 | 3/4 | 47/64 | |
5/8 | 14 | 21.0 | 53/64 | 13/16 | |
3/4 | 14 | 24.5 | 31/32 | 61/64 | |
7/8 | 14 | 1-7/64 | 28.0 | ||
1 | 11 | 1-7/32 | 30.5 | ||
1-1/4 | 11 | 39.5 | 1-35/64 | 39.0 | |
1-1/2 | 11 | 45.5 | 1-25/32 | 45.0 | 1-49/64 |
2 | 11 | 2-1/4 | |||
2-1/2 | 11 | 2-27/32 | |||
3 | 11 | Hole size 3.369 - 3.344 inch |
Size Inch | Threads per Inch | Tapping Drill Sizes | |||
---|---|---|---|---|---|
With Reamer | Without Reamer | ||||
mm | Inch | mm | Inch | ||
1/8 | 27 | 8.3 | 21/64 | 8.4 | |
1/4 | 18 | 10.8 | 27/64 | 11.2 | 7/16 |
3/8 | 18 | 14.25 | 9/16 | 14.25 | 9/16 |
1/2 | 14 | 17.5 | 11/16 | 45/64 | |
3/4 | 14 | 22.5 | 57/64 | 23.0 | 29/32 |
1 | 11-1/2 | 28.5 | 1-1/8 | 29.0 | 1-9/64 |
1-1/4 | 11-1/2 | 37.0 | 1-15/32 | 37.5 | 1-31/64 |
1-1/2 | 11-1/2 | 43.5 | 1-23/32 | 44.0 | 1-47/64 |
2 | 11-1/2 | 2-3/16 | 2-13/64 |