Paul (Notts)
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| posted on 10/2/08 at 07:05 AM |
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drill size for m6 tap
Quick question...
What size drill bit should I use so that
i can cut a M6 thread?
Cheers
Paul
last job before SVA
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rayward
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| posted on 10/2/08 at 07:28 AM |
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5MM
hth
Ray
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madteg
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| posted on 10/2/08 at 08:26 AM |
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6mm tap
Easy way to work out size
6x1.25mm =-1.25 =4.75 tap
8x1.25mm=-1.25 =6.75 tap
10x1.5mm=-1.5=-1.5=8.5 tap
and so on.
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triumphdave
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| posted on 10/2/08 at 08:38 AM |
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quote:
Originally posted by madteg
Easy way to work out size
6x1.25mm =-1.25 =4.75 tap
8x1.25mm=-1.25 =6.75 tap
10x1.5mm=-1.5=-1.5=8.5 tap
and so on.
6mm tap is 1mm pitch so a 5mm drill 
If you always do what you have always done you will always get what you have always got
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zilspeed
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| posted on 10/2/08 at 08:51 AM |
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Or, use of these here puppies.
Makes the job a real piece of cake.
Your local grumpy engineering supplies shop buried on an industrial estate soemwhere will have them.
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rusty nuts
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| posted on 10/2/08 at 09:21 AM |
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Little tip for drilling for ANY thread size is to take a nut and for the thread you want to tap and find the largest drill bit that goes through
it.
Works with all thread types
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carpmart
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| posted on 10/2/08 at 09:30 AM |
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quote:
Originally posted by rusty nuts
Little tip for drilling for ANY thread size is to take a nut and for the thread you want to tap and find the largest drill bit that goes through
it.
Works with all thread types
Great tip that!
You only live once - make the most of it!
Radical Clubsport, Kwaker motor
'94 MX5 MK1, 1.8
F10 M5 - 600bhp Daily Hack 
Range Rover Sport - Wife's Car
Mercedes A class - Son's Car
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Hellfire
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| posted on 10/2/08 at 10:14 AM |
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Drill & Tap Chart
quote:
Originally posted by rusty nuts
Little tip for drilling for ANY thread size is to take a nut and for the thread you want to tap and find the largest drill bit that goes through
it.
Works with all thread types
This only applies of you want weak threads. Mass produced nuts are produced with oversize bores. They are then thread rolled, this deforms the thread
(not cut) making the thread slightly stronger. IMO - this is not the way to produce a proper tapped hole, though it does work for a while.
It also depends very much on the pitch of the thread. A 6mm Tap is available in 3 (yes 3) common Pitch's. 1mm, 0.75mm and 0.5mm therefore the
drill size varies from size to size.
The prferred way of finding out the drill size is to use a Zeus Book - (Engineers Bible) but if this is not available to you then use a Drill &
Tap Chart like this one
DRILL & TAP CHART
Steve
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bob
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| posted on 10/2/08 at 10:46 AM |
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Plenty of charts on the net, got a few for various jobs i use.
This one is pretty easy to read
linky
and another
[Edited on 10/2/08 by bob]
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carpmart
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| posted on 10/2/08 at 11:28 AM |
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quote:
Originally posted by carpmart
quote:
Originally posted by rusty nuts
Little tip for drilling for ANY thread size is to take a nut and for the thread you want to tap and find the largest drill bit that goes through
it.
Works with all thread types
Great tip that!
It appears it wasn't such a great tip after all! 
You only live once - make the most of it!
Radical Clubsport, Kwaker motor
'94 MX5 MK1, 1.8
F10 M5 - 600bhp Daily Hack
Range Rover Sport - Wife's Car
Mercedes A class - Son's Car
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