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Thread tools \ Core hole tables, thread cutting, thread forming, thread milling

nominal gear core hole core dia. female thread 3B nominal gear core hole core dia. female thread 3B
dia. (drill) dia. dia. (drill) dia.
per inch mm min. mm max. mm per inch mm min. mm max. mm
No. 10-32 4,20 4,054 4,255 1/2-20 11,60 11,463 11,661
No. 12-28 4,75 4,602 4,816 9/16-18 13,00 12,913 13,122
No. 1/4-28 5,60 5,466 5,662 5/8-18 14,60 14,501 14,702
5/16-24 7,00 6,906 7,109

core hole diameter for thread cutting and thread milling
UNF thread ASME B1.1

nominal gear core hole core dia. female thread 2B nominal gear core hole core dia. female thread 2B
(drill) Ø
(drill) Ø
dia. DIN 336 dia. DIN 336
per inch mm min. mm max. mm per inch mm min. mm max. mm
No. 1-72 1,55 1,473 1,610 7/16-20 9,90 9,728 10,033
No. 2-64 1,85 1,755 1,910 1/2-20 11,50 11,328 11,608
No. 3-56 2,15 2,024 2,197 9/16-18 12,90 12,751 13,081
No. 4-48 2,40 2,271 2,459 5/8-18 14,50 14,351 14,681
No. 5-44 2,70 2,550 2,741 3/4-16 17,50 17,323 17,678
No. 6-40 2,95 2,819 3,023 7/8-14 20,40 20,269 20,650
No. 8-36 3,50 3,404 3,607 1-12 23,25 23,114 23,571
No. 10-32 4,10 3,962 4,166 1 1/8-12 26,50 26,289 26,746
No. 12-28 4,60 4,496 4,724 1 1/4-12 29,50 29,464 29,921
1/4-28 5,50 5,359 5,588 1 3/8-12 32,75 32,639 33,096
5/16-24 6,90 6,782 7,036 1 1/2-12 36,00 35,814 36,271
3/8-24 8,50 8,382 8,636

core hole diameter for thread cutting and thread milling
BSW (Whitworth) thread BS84

core hole
nominal dia. gear core hole core dia. female thread nominal dia. gear (drill) dia. core dia. female thread
(drill) dia.
per inch mm min. mm max. mm per inch mm min. mm max. mm
W 1/16 60 1,20 1,045 1,230 W 5/8 11 13,50 12,918 13,558
W 3/32 48 1,80 1,704 1,912 W 3/4 10 16,25 15,797 16,483
W 1/8 40 2,50 2,362 2,591 W 7/8 9 19,25 18,611 19,353
W 5/32 32 3,20 2,952 3,214 W 1 8 22,00 21,334 22,147
W 3/16 24 3,60 3,407 3,745 W 1 1/8 7 24,50 23,928 24,832
W 7/32 24 4,50 4,201 4,539 W 1 1/4 7 27,75 27,103 28,007
W 1/4 20 5,10 4,724 5,156 W 1 3/8 6 30,50 29,504 30,528
W 5/16 18 6,50 6,130 6,590 W 1 1/2 6 33,50 32,679 33,703
W 3/8 16 7,90 7,492 7,987 W 1 5/8 5 35,50 34,769 35,963
W 7/16 14 9,20 8,789 9,330 W 1 3/4 5 39,00 37,944 39,138
W 1/2 12 10,50 9,989 10,591 W 2 4,5 44,50 43,571 44,877
W 9/16 12 12,00 11,577 12,179

core hole diameter for thread cutting and thread milling
(Whitworth) pipe thread (in accordance with DIN ISO 228-1)

core hole core hole
nominal dia. gear (drill) Ø core dia. female thread nominal dia. gear (drill) Ø core dia. female thread
DIN 336 DIN 336
per inch mm min. mm max. mm per inch mm min. mm max. mm
G 1/16 28 6,80 6,561 6,843 G 7/8 14 28,25 27,877 28,418
G 1/8 28 8,80 8,566 8,848 G 1 11 30,75 30,291 30,931
G 1/4 19 11,80 11,445 11,890 G 1 1/8 11 35,50 34,939 35,579
G 3/8 19 15,25 14,950 15,395 G 1 1/4 11 39,50 38,952 39,592
G 1/2 14 19,00 18,631 19,172 G 1 1/2 11 45,25 44,845 45,485
G 5/8 14 21,00 20,587 21,128 G 1 3/4 11 51,00 50,788 51,428
G 3/4 14 24,50 24,117 24,658 G 2 11 57,00 56,656 57,296
core hole diameter for thread cutting and thread milling
steel-armoured pipe thread according to DIN 40430

core hole
nominal dia. gear core hole core dia. female thread nominal dia. gear (drill) dia. core dia. female thread
(drill) dia.
per inch mm min. mm max. mm per inch mm min. mm max. mm
Pg 7 20 11,40 11,280 11,430 Pg 21 16 26,90 26,780 27,030
Pg 9 18 14,00 13,860 14,010 Pg 29 16 35,50 35,480 35,730
Pg 11 18 17,30 17,260 17,410 Pg 36 16 45,50 45,480 45,730
Pg 13.5 18 19,00 19,060 19,210 Pg 42 16 52,50 52,480 52,730
Pg 16 18 21,30 21,160 21,310 Pg 48 16 57,80 57,780 58,030

Source: Hahn+Kolb Werkzeuge GmbH
Technical data subject to change. www.iconridge.com
Availability subject to country specific rules and regulations. 156

0317_EN_2018_KERN[21847484]-W.indd 320 12/17/2018 3:32:21 PM