DRILL SIZE CUTTING TAPS
P
P
60°
60°
ISO Metric coarse thread DIN 8140 Part 2
8-UN thread ASME B1.1
Maximum core diam. (tol. 3B) [mm] D 1
Drill size* [mm]
Drill size* [mm]
Pitch [TPI]
EG-M
8-UN
EG-M 3
3,15
1 1/8" 8 1 1/4" 8 1 3/8" 8 1 1/2" 8 1 5/8" 8 1 3/4" 8 1 7/8" 8
25,519 28,694 31,869 35,044 38,219 41,394 44,569 47,744
25,4 28,6 31,8 35,0 38,1 41,3 44,5 47,7
4 5 6 8
4,2
5,25
6,3 8,4
10 12 14 16
10,5 12,5 14,5 16,5
2" 8
P
P
60°
60°
Unified coarse thread UNC ASME - B1.1
Unified fine thread UNF ASME - B1.1
Maximum core diam. (tol. 3B) [mm] D 1
Maximum core diam. (tol. 3B) [mm] D 1
Drill size* [mm]
Drill size* [mm]
Pitch [TPI]
Pitch [TPI]
UNC
UNF
Nr. 1 64 Nr. 2 56 Nr. 3 48 Nr. 4 40 Nr. 5 40
1,582 1,872 2,146 2,385 2,697 2,896 3,528 3,950 4,590 5,250 6,680 8,082 9,441
1,55 1,85
Nr. 0 80 Nr. 1 72 Nr. 2 64 Nr. 3 56 Nr. 4 48 Nr. 5 44 Nr. 6 40 Nr. 8 36 Nr. 10 32 Nr. 12 28 1/4" 28 5/16" 24 3/8" 24 7/16" 20 1/2" 20 9/16" 18
1,306 1,613 1,913 2,197 2,459 2,741 3,012 3,597
1,25 1,55 1,85 2,15
2,1
2,35 2,65 2,85
2,4 2,7
Nr. 6 Nr. 8
32 32
3,5 3,9 4,5 5,1 6,6
2,95
Nr. 10 24 Nr. 12 24 1/4" 20 5/16" 18 3/8" 16 7/16" 14 1/2" 13 9/16" 12 5/8" 11 3/4" 10
3,5 4,1 4,6 5,5 6,9 8,5 9,9
4,168 4,717 5,563 6,995 8,565 9,947 11,524 12,969 14,554 17,546 20,493 23,363 26,538 29,713 32,888 36,063
8
9,4
10,881 12,301 13,693 16,624 19,520 22,344 25,082 28,258 30,851 34,026 39,560
10,8 12,2 13,5 16,5 19,5
11,5 12,9 14,5 17,5 20,4
5/8" 18 3/4" 16 7/8" 14
7/8"
9 8 7 7 6 6 5
1"
22,25
1 1/8" 1 1/4" 1 3/8" 1 1/2" 1 3/4"
25 28
1" 12
23,25
1 1/8" 12 1 1/4" 12 1 3/8" 12 1 1/2" 12
26,5 29,5
30,75
34
32,75
39,5
36
2" 4,5 45,367
45
(*) Drill size according to DIN 336
265
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