Drill size cutting taps
P
P
P
55°
55°
55°
Whitworth thread BSW - BS 84
Whitworth pipe thread EN - ISO 228
Rp thread (BSPP) DIN EN 10226-1
Maximum core diam. [mm] D1
Maximum core diam. [mm] D1
Pitch [TPI]
Pitch [TPI]
Pitch [TPI]
Maximum core diam. [mm] D1
Drill size* [mm]
Drill size [mm]
Drill size* [mm]
D
D
D
1/8” 1/4” 3/8” 1/2” 3/4”
28 19 19 14 14
8,637 11,549 15,054 18,773 24,259
8,6 11,5 15,0 18,5 24,0
3/32"
48 40 32 24 24 20
1,912 2,591 3,214 3,744 4,539 5,156 6,589 7,988
1,9
G 1/8"
28 19 19 14 14 14 14
8,848 11,890 15,395 19,172 21,128 24,658 28,418 30,931 35,579 39,592 42,005 45,485 51,428 57,296 63,392 67,080 72,866 79,216 85,566 91,662 98,012 104,362 110,712
8,8 11,8
1/8"
2,55
1/4" 3/8" 1/2" 5/8" 3/4" 7/8"
5/32" 3/16" 7/32"
3,2 3,7 4,5 5,1 6,5 7,9
15,25
19 21
1/4"
24,5
5/16" 3/8" 7/16"
18 16 14 12 12
28,25 30,75
1"
11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11
9,332 10,589 12,177 13,559 16,485 19,355 22,149 24,831 28,006 30,528 33,703 35,961 39,136 41,702
9,25
1 1/8" 1 1/4" 1 3/8" 1 1/2" 1 3/4"
35,5 39,5 41,9
1/2"
10,5
9/16"
12
5/8" 3/4" 7/8"
11
13,5 16,4
45,25
10
51 57
9 8 7 7 6 6 5 5
19,25
2"
1"
22
2 1/4" 2 3/8" 2 1/2" 2 3/4"
63,3
1 1/8" 1 1/4" 1 3/8" 1 1/2" 1 5/8" 1 3/4" 1 7/8"
24,75 27,75
67
72,8 79,1 85,5 91,5
30,3 33,5 35,5
3"
3 1/4" 3 1/2" 3 3/4"
39
98
4,5
41,5 44,5
104
2"
4,5 44,877
4"
110,5
2 1/4" 2 1/2" 2 3/4"
4 4
50,465 56,815
50
56,3 61,5
3,5 62,182 3,5 68,532
3"
68
(*) Prefori secondo DIN 336
1:16
1:16
P
P
1:16
P
60°
60°
55°
Conical gas thread Rc (BSPT) - DIN EN 10226-2
National pipe thread NPT - ANSI B1.20.1
Dryseal national pipe thread NPTF - ANSI B1.20.3
Pitch [TPI]
Drill size** [mm] D1
Pitch [TPI]
Drill size** [mm] D1
Pitch [TPI]
Drill size** [mm] D1
D
t1 [mm]
D
t1 [mm]
D
t1 [mm]
1/16" 1/8" 1/4" 3/8" 1/2" 3/4"
28 28 19 19 14 14
6,2 8,2
11,9 11,9 17,7 18,1
1/16" 1/8" 1/4" 3/8" 1/2" 3/4"
27 27 18 18 14 14
6,15
12 12
1/16" 1/8" 1/4" 3/8" 1/2" 3/4"
27 27 18 18 14 14
6,15
12 12
8,5
8,5
11
11
17,5 17,6 22,9
11
17,5 17,6 22,9
14,5
14,5
14,5 17,8
18
24
17,85
23,5 29,5
25,3 30,6 32,9 32,9 37,2
23,2
23
23 29
23
1"
11 11 11 11
1"
11,5 11,5 11,5 11,5
29
27,4 28,1 28,4 28,4
1"
11,5 11,5 11,5 11,5
27,4 28,1 28,4 28,4
1 1/4" 1 1/2"
38 44
1 1/4" 1 1/2"
37,8
1 1/4" 1 1/2"
37,8 43,8
44 56
2"
55,5
2"
2"
56
** For conical threads tapered drill holes are preferable. Please request specific tables.
252 | vergnano
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