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] D 1
Maximum core diam. [mm] D 1
Drill size [mm]
Drill size* [mm]
Drill size* [mm]
Pitch [TPI]
Pitch [TPI]
Pitch [TPI]
Maximum core diam. [mm] D 1
BSW
G
Rp
3/32" 48 1/8" 40 5/32" 32 3/16" 24 7/32" 24 1/4" 20 5/16" 18 3/8" 16 7/16" 14 1/2" 12 9/16" 12 5/8" 11 3/4" 10 7/8" 9
1,912 2,591 3,214 3,744 4,539 5,156 6,589 7,988 9,332
1,9
G 1/8" 28 1/4" 19 3/8" 19 1/2" 14 5/8" 14 3/4" 14 7/8" 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
8,8
1/8” 28 1/4” 19 3/8” 19 1/2” 14 3/4” 14
8,637 11,549 15,054 18,773 24,259
8,6
2,55
11,8
11,5 15,0 18,5 24,0
3,2 3,7 4,5 5,1 6,5 7,9
15,25
19 21
24,5
28,25 30,75
1" 11
9,25
1 1/8" 11 1 1/4" 11 1 3/8" 11 1 1/2" 11 1 3/4" 11
35,5 39,5 41,9
10,589 12,177 13,559 16,485 19,355 22,149 24,831 28,006 30,528 33,703 35,961 39,136
10,5
12
13,5 16,4
45,25
51 57
19,25
2" 11
1" 8
22
2 1/4" 11 2 3/8" 11 2 1/2" 11 2 3/4" 11
63,3
1 1/8" 7 1 1/4" 7 1 3/8" 6 1 1/2" 6 1 5/8" 5 1 3/4" 5
24,75 27,75
67
72,8 79,1 85,5 91,5
30,3 33,5 35,5
3" 11
3 1/4" 11 3 1/2" 11
39
98,012 98 3 3/4" 11 104,362 104 4" 11 110,712 110,5
1 7/8" 4,5 41,702 2" 4,5 44,877
41,5 44,5
2 1/4" 4 2 1/2" 4
50,465 56,815
50
56,3 61,5
2 3/4" 3,5 62,182 3" 3,5 68,532
68
(*) Drill size according to 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
Drill size** [mm] D 1
Drill size** [mm] D 1
Drill size** [mm] D 1
Pitch [TPI]
Pitch [TPI]
Pitch [TPI]
Rc
NPT
NPTF
t1 [mm]
t1 [mm]
t1 [mm]
1/16" 28 1/8" 28 1/4" 19 3/8" 19 1/2" 14 3/4" 14 1" 11 1 1/4" 11 1 1/2" 11
6,2 8,2
11,9 11,9 17,7 18,1
1/16" 27 1/8" 27 1/4" 18 3/8" 18 1/2" 14 3/4" 14
6,15
12 12
1/16" 27 1/8" 27 1/4" 18 3/8" 18 1/2" 14 3/4" 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
23
1" 11,5 29
27,4 28,1 28,4 28,4
1" 11,5 29
27,4 28,1 28,4 28,4
38 44
1 1/4" 11,5 37,8 1 1/2" 11,5 44
1 1/4" 11,5 37,8 1 1/2" 11,5 43,8
2" 11
55,5
2" 11,5 56
2" 11,5 56
** For conical threads tapered drill holes are preferable. Please request specific tables.
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