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

nominal core hole nominal core hole
(drill) Ø
(drill) Ø
dia. gear DIN 336 core dia. female thread 2B dia. gear DIN 336 core dia. female thread 2B
per inch mm min. mm max. mm per inch mm min. mm max. mm
No. 1-64 1,55 1,425 1,580 1/2-13 10,80 10,592 11,024
No. 2-56 1,85 1,694 1,872 9/16-12 12,20 11,989 12,446
No. 3-48 2,10 1,941 2,146 5/8-11 13,50 13,386 13,868
No. 4-40 2,35 2,157 2,385 3/4-10 16,50 16,307 16,840
No. 5-40 2,65 2,487 2,698 7/8-9 19,50 19,177 19,761
No. 6-32 2,85 2,642 2,896 1-8 22,25 21,971 22,606
No. 8-32 3,50 3,302 3,531 1 1/8-7 25,00 24,638 25,349
No. 10-24 3,90 3,683 3,937 1 1/4-7 28,00 27,813 28,524
No. 12-24 4,50 4,343 4,597 1 3/8-6 30,75 30,353 31,115
1/4-20 5,10 4,978 5,258 1 1/2-6 34,00 33,528 34,290
5/16-18 6,60 6,401 6,731 1 3/4-5 39,50 38,938 39,802
3/8-16 8,00 7,798 8,153 2-4.5 45,00 44,679 45,593
7/16-14 9,40 9,144 9,550
core hole diameter for thread cutting and thread milling
MJ thread DIN ISO 5855

nominal dia. x core hole nominal dia. x core hole
pitch P (drill) dia. core dia. female thread 5H* pitch P (drill) dia. core dia. female thread 5H*
mm mm min. mm max. mm mm mm min. mm max. mm
MJ 3 x 0.50 2,60 2,513 2,653 MJ 8 x 1.00 7,10 7,026 7,216
MJ 4 x 0.70 3,40 3,318 3,498 MJ 8 x 1.25 6,90 6,782 6,994
MJ 5 x 0.80 4,30 4,221 4,421 MJ 10 x 1.00 9,10 9,026 9,216
MJ 6 x 0.50 5,55 5,513 5,625 MJ 10 x 1.25 8,90 8,782 8,994
MJ 6 x 0.75 5,35 5,269 5,419 MJ 10 x 1.50 8,60 8,539 8,775
MJ 6 x 1.00 5,10 5,026 5,216 MJ 12 x 1.75 10,40 10,295 10,560
MJ 8 x 0.50 7,55 7,513 7,625 MJ 16 x 2.00 14,20 14,051 14,351
MJ 8 x 0.75 7,35 7,269 7,419
* MJ 3 x 0.50 to MJ 5 x 0.80 core dia. female thread 6H
core hole diameter for thread cutting and thread milling
UNJC thread ISO 3161

nominal core hole nominal core hole
dia. gear (drill) dia. core dia. female thread 3B dia. gear (drill) dia. core dia. female thread 3B
per inch mm min. mm max. mm per inch mm min. mm max. mm
No. 6-32 2,85 2,733 2,939 3/8-16 8,20 7,978 8,255
No. 8-32 3,55 3,393 3,599 7/16-14 9,60 9,346 9,639
No. 10-24 4,00 3,795 4,064 1/2-13 11,00 10,798 11,095
No. 12-24 4,60 4,455 4,704 9/16-12 12,40 12,228 12,482
No. 1/4-20 5,30 5,113 5,387 5/8-11 13,80 13,627 13,904
5/16-18 6,75 6,563 6,833

core hole diameter for thread cutting and thread milling
UNJF thread ISO 3161

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. 6-40 3,00 2,888 3,053 3/8-24 8,60 8,494 8,679
No. 8-36 3,60 3,480 3,663 7/16-20 10,00 9,876 10,084
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 core hole nominal core hole
(drill) Ø
(drill) Ø
dia. gear DIN 336 core dia. female thread 2B dia. gear DIN 336 core dia. female thread 2B
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

Source: Hahn+Kolb Werkzeuge GmbH
Technical data subject to change. www.iconridge.com 285
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