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Which drill sizes to use when tapping a thread?

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Raffles
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Joined: 14 Apr 2009
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PostPosted: 15:17 - 08 May 2010    Post subject: Which drill sizes to use when tapping a thread? Reply with quote
When tapping a 5mm thread and a 6mm thread into aluminium which respective drill sizes should I use?
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hmmmnz
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PostPosted: 15:32 - 08 May 2010    Post subject: Reply with quote
go down 1mm on both
its actually 4.2 for a 5mm but 4 is fine
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Blue_SV650S
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PostPosted: 15:47 - 08 May 2010    Post subject: Re: Which drill sizes to use when tapping a thread? Reply with quote
Raffles wrote:
When tapping a 5mm thread and a 6mm thread into aluminium which respective drill sizes should I use?


M5 = 4.2mm drillbit
M6 = 5mm drillbit
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Raffles
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PostPosted: 16:48 - 08 May 2010    Post subject: Reply with quote
Thank you boys, very much helpfull. There's some Thumbs Up heading your way.
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Nufkamp
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PostPosted: 21:48 - 08 May 2010    Post subject: Reply with quote
For other thread sizes go here

https://www.simetric.co.uk/sidrill.htm
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V2
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Joined: 06 Feb 2006
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PostPosted: 23:09 - 08 May 2010    Post subject: Reply with quote
Just look on the side of the tap and if it says M5 X 0.8 then 5-0.8 = 4.2mm , M6 X 1.0 then 6-1= 5mm etc
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steven_191
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Joined: 31 May 2009
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PostPosted: 23:13 - 08 May 2010    Post subject: Reply with quote
Here's a good guide I've found easy to remember. Only a guide tho. You subtract the the thread pitch from the bolt size you want. Eg m6x1.25. So you would drill 4.75mm. I think the equivilent is 4.8mm.
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V2
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PostPosted: 23:15 - 08 May 2010    Post subject: Reply with quote
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oldbiker
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Joined: 15 Nov 2009
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PostPosted: 23:45 - 08 May 2010    Post subject: Reply with quote
steven_191 wrote:
Here's a good guide I've found easy to remember. Only a guide tho. You subtract the the thread pitch from the bolt size you want. Eg m6x1.25. So you would drill 4.75mm. I think the equivilent is 4.8mm.


This is correct for all iso threads, that is any thread with a 60 degree angle on the thread profile . so for any metric or ba thread subtract the pitch from the diameter.

well done steven_191 you are awarded top marks for this weeks class
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Old Thread Alert!

The last post was made 16 years, 14 days ago. Instead of replying here, would creating a new thread be more useful?
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