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Taps

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3D wireframe of a tap by Vergnano

Drill size

Cutting taps

ISO Metric corse thread
ISO Metric coarse thread DIN 13
MPitch[mm]Maximum core diameter(tol. 6H) [mm] D₁Drill size*[mm]
10,250,785 (1)0,75
1,10,250,885 (1)0,85
1,20,250,985 (1)0,95
1,40,31,142 (1)1,1
1,60,351,3211,25
1,7 (3)0,351,4211,35
1,80,351,5211,45
20,41,6791,6
2,20,451,8381,75
2,3 (3)0,41,9381,9
2,50,452,1382,05
2,6 (3)0,452,2382,1
30,52,5992,5
3,50,63,0102,9
40,73,4223,3
4,50,753,8783,7
50,84,3344,2
615,1535
716,1536
81,256,9126,8
91,257,9127,8
101,58,6768,5
111,59,6769,5
121,7510,44110,2
14212,21012
16214,21014
182,515,74415,5
202,517,74417,5
222,519,74419,5
24321,25221
27324,25224
303,526,77126,5
333,529,77129,5
36432,27032
39435,27035
424,537,79937,5
454,540,79940,5
48543,29743
52547,29747
565,550,79650,5
60 (3)5,554,79654,5
64 (3)658,30558
68 (3)662,30562
(*)
Drill size according to DIN 336
(1)
Tolerance 5H
(2)
Tolerance 4H
(3)
Size not included in DIN 336
ISO Metric fine thread
ISO Metric fine thread DIN 13
MPitch[mm]Maximum core diameter(tol. 6H) [mm] D₁Drill size*[mm]
2 (3)0,251,774 (2)1,75
2,3 (3)0,252,0852,05
2,50,352,2212,15
30,352,7212,65
3,50,353,2213,15
40,53,5993,5
4,50,54,0994
50,54,5994,5
5,50,55,0995
60,755,3785,2
70,756,3786,2
80,757,3787,2
817,1537
90,758,3788,2
918,1538
100,759,3789,2
1019,1539
101,258,9128,8
110,7510,37810,2
11110,15310
12 (3)0,7511,37811,2
12111,15311
121,2510,91210,8
121,510,67610,5
14113,15313
141,2512,91212,8
141,512,67612,5
15114,15314
151,513,67613,5
16115,15315
161,514,67614,5
17116,15316
171,515,67615,5
18117,15317
181,516,67616,5
18216,21016
20119,15319
201,518,67618,5
20218,21018
22121,15321
221,520,67620,5
22220,21020
24123,15323
241,522,67622,5
24222,21022
M 25124,15324
251,523,67623,5
25223,21023
261,524,67624,5
27126,15326
271,525,67625,5
27225,21025
28127,15327
281,526,67626,5
28226,21026
30129,15329
301,528,67628,5
30228,21028
30327,25227
321,530,67630,5
32230,21030
331,531,67631,5
33231,21031
33330,25230
351,533,67633,5
361,534,67634,5
36234,21034
36333,25233
381,536,67636,5
391,537,67637,5
39237,21037
39336,25236
401,538,67638,5
40238,21038
40337,25237
421,540,67640,5
42240,21040
42339,25239
451,543,67643,5
45243,21043
45342,25242
481,546,67646,5
48246,21046
48345,25245
501,548,67648,5
50248,21048
50347,25247
521,550,67650,5
52250,21050
52349,25249
(*)
Drill size according to DIN 336
(1)
Tolerance 5H
(2)
Tolerance 4H
(3)
Size not included in DIN 336
ISO Metric coarse thread - DIN 8140-2
ISO Metric coarse thread DIN 8140 Part 2
EG-MDrill size*[mm]
33,15
44,2
55,25
66,3
88,4
1010,5
1212,5
1414,5
1616,5
(*)
Drill size according to DIN 336
8-UN thread - ASME B1.1
8-UN thread ASME B1.1
8-UNPitchTPIMaximum core diameter(tol. 3B) [mm] D₁Drill size*[mm]
11/8″825,51925,4
11/4″828,69428,6
13/8″831,86931,8
11/2″835,04435,0
15/8″838,21938,1
13/4″841,39441,3
17/8″844,56944,5
2″847,74447,7
(*)
Drill size according to DIN 336
Unified coarse thread UNC ASME - B1.1
Unified coarse thread UNC ASME – B1.1
UNCPitchTPIMaximum core diameter(tol. 3B) [mm] D₁Drill size*[mm]
Nr. 1641,5821,55
Nr. 2561,8721,85
Nr. 3482,1462,1
Nr. 4402,3852,35
Nr. 5402,6972,65
Nr. 6322,8962,85
Nr. 8323,5283,5
Nr. 10243,9503,9
Nr. 12244,5904,5
1/4″205,2505,1
5/16″186,6806,6
3/8″168,0828
7/16″149,4419,4
1/2″1310,88110,8
9/16″1212,30112,2
5/8″1113,69313,5
3/4″1016,62416,5
7/8″919,52019,5
1″822,34422,25
1 1/8″725,08225
1 1/4″728,25828
1 3/8″630,85130,75
1 1/2″634,02634
1 3/4″539,56039,5
2″4,545,36745
(*)
Drill size according to DIN 336
Unified fine thread - UNF ASME B1.1
Unified fine thread UNF ASME – B1.1
UNFPitchTPIMaximum core diameter(tol. 3B) [mm] D₁Drill size*[mm]
Nr. 0801,3061,25
Nr. 1721,6131,55
Nr. 2641,9131,85
Nr. 3562,1972,15
Nr. 4482,4592,4
Nr. 5442,7412,7
Nr. 6403,0122,95
Nr. 8363,5973,5
Nr. 10324,1684,1
Nr. 12284,7174,6
1/4″285,5635,5
5/16″246,9956,9
3/8″248,5658,5
7/16″209,9479,9
1/2″2011,52411,5
9/16″1812,96912,9
5/8″1814,55414,5
3/4″1617,54617,5
7/8″1420,49320,4
1″1223,36323,25
1 1/8″1226,53826,5
1 1/4″1229,71329,5
1 3/8″1232,88832,75
1 1/2″1236,06336
(*)
Drill size according to DIN 336
Whitworth thread - BS 84
Whitworth thread BSW – BS 84
BSWPitchTPIMaximum core diameter[mm] D₁Drill size*[mm]
3/32″481,9121,9
1/8″402,5912,55
5/32″323,2143,2
3/16″243,7443,7
7/32″244,5394,5
1/4″205,1565,1
5/16″186,5896,5
3/8″167,9887,9
7/16″149,3329,25
1/2″1210,58910,5
9/16″1212,17712
5/8″1113,55913,5
3/4″1016,48516,4
7/8″919,35519,25
1″822,14922
1 1/8″724,83124,75
1 1/4″728,00627,75
1 3/8″630,52830,3
1 1/2″633,70333,5
1 5/8″535,96135,5
1 3/4″539,13639
1 7/8″4,541,70241,5
2″4,544,87744,5
2 1/4″450,46550
2 1/2″456,81556,3
2 3/4″3,562,18261,5
3″3,568,53268
(*)
Drill size according to DIN 336
Whitworth pipe thread - EN ISO 228
Whitworth pipe thread EN – ISO 228
GPitchTPIMaximum core diameter[mm] D₁Drill size*[mm]
G 1/8″288,8488,8
1/4″1911,89011,8
3/8″1915,39515,25
1/2″1419,17219
5/8″1421,12821
3/4″1424,65824,5
7/8″1428,41828,25
1″1130,93130,75
1 1/8″1135,57935,5
1 1/4″1139,59239,5
1 3/8″1142,00541,9
1 1/2″1145,48545,25
1 3/4″1151,42851
2″1157,29657
2 1/4″1163,39263,3
2 3/8″1167,08067
2 1/2″1172,86672,8
2 3/4″1179,21679,1
3″1185,56685,5
3 1/4″1191,66291,5
3 1/2″1198,01298
3 3/4″11104,362104
4″11110,712110,5
(*)
Drill size according to DIN 336
Rp thread (BSPP) - DIN EN 10226-1
Rp thread (BSPP) DIN EN 10226-1
RpPitchTPIMaximum core diameter[mm] D₁Drill size*[mm]
1/8”288,6378,6
1/4″1911,54911,5
3/8″1915,05415
1/2″1418,77318,5
3/4″1424,25924,0
(*)
Drill size according to DIN 336
Conical gas thread Rc (BSPT) taper 1:16 - BS 21 and DIN EN 10226-2
Conical gas thread Rc (BSPT) – DIN EN 10226-2
RcPitchTPIDrill size**[mm] D₁t1 [mm]
1/16″286,211,9
1/8″288,211,9
1/4″191117,7
3/8″1914,518,1
1/2″141824
3/4″1423,525,3
1″1129,530,6
1 1/4″113832,9
1 1/2″114432,9
2″1155,537,2
(**)
For conical threads tapered drill holes are preferable. Please request specific tables.
National pipe thread, taper 1:16 - ASME/ANSI B1.20.1
National pipe thread NPT – ANSI B1.20.1
NPTPitchTPIDrill size**[mm] D₁t1 [mm]
1/16″276,1512
1/8″278,512
1/4″181117,5
3/8″1814,517,6
1/2″1417,8522,9
3/4″1423,223
1″11,52927,4
1 1/4″11,537,828,1
1 1/2″11,54428,4
2″11,55628,4
(**)
For conical threads tapered drill holes are preferable. Please request specific tables.
Dryseal National pipe thread, taper 1:16 - ASME/ANSI B1.20.3
Dryseal national pipe thread NPTF – ANSI B1.20.3
NPTFPitchTPIDrill size**[mm] D₁t1 [mm]
1/16″276,1512
1/8″278,512
1/4″181117,5
3/8″1814,517,6
1/2″1417,822,9
3/4″142323
1″11,52927,4
1 1/4″11,537,828,1
1 1/2″11,543,828,4
2″11,55628,4
(**)
For conical threads tapered drill holes are preferable. Please request specific tables.

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