Sorry, the mail didn't transport the table like it was supposed to. I
try again without table function:
Thread Pitch Core diam. bolt Core diam. nut Drill size
mm Wrench size mm
M1 0,25 0,693 0,729
0,75 -
M1,2 0,25 0,893 0,929
0,73 -
M1,6 0,35 1,171 1,221
1,30 3,2
M2 0,40 1,509 1,567
1,60 4
M2,5 0,45 1,948 2,013
2,10 5
M3 0,50 2,387 2,459
2,50 5,5
M4 0,70 3,141 3,242
3,30 7
M5 0,80 4,019 4,134
4,20 8
M6 1,00 4,773 4,917
5,00 10
M8 1,25 6,466 6,647
6,80 13 / 14
M10 1,50 8,160 8,376
8,50 17 / 16
M12 1,75 9,853 10,106
10,20 19 / 18
M16 2,00 13,546 13,835
14,00 24
M20 2,50 16,933 17,294
17,50 30
Now, I hope that's better. Many of the drill size values were even smaller
(tighter) before the DIN was changed some years ago: e.g. M2.3 and M2.6 were
united to M2.5, M3.5 was (almost) cancelled though it still is a very common
thread with electric appliances, etc.
Peter.
Am 24.01.2016 13:28, schrieb Peter Blodow:
> Erik, I don't know wat table you were glancing at, but here is the table
> from Europes No:1 tool seller, Hoffmann Group
> (http://www.gewinde-norm.de/metrisches-iso-gewinde-din-13.htm), listing
> metric ISO / DIN13 threads:
>
> Thread Pitch Core diam. bolt Core diam. nut
> Drill size mm Wrench size mm
> Gewinde
> Steigung
>
> Kerndurchmesser
> Bolzen
>
> Kerndurchmesser
> Mutter
>
> Kernlochbohrer
>
> Schlüsselweite
> (Sechskant)
> M1
> 0,25
>
> 0,693
>
> 0,729
>
> 0,75
>
> -
> M1,2
> 0,25
>
> 0,893
>
> 0,929
>
> 0,73
>
> -
> M1,6
> 0,35
>
> 1,171
>
> 1,221
>
> 1,30
>
>
> 3,2
>
> M2
> 0,40
>
> 1,509
>
> 1,567
>
> 1,60
>
> 4
> M2,5
> 0,45
>
> 1,948
>
> 2,013
>
> 2,10
>
> 5
> M3
> 0,50
>
> 2,387
>
> 2,459
>
> 2,50
>
> 5,5
> M4
> 0,70
>
> 3,141
>
> 3,242
>
> 3,30
>
> 7
> M5
> 0,80
>
> 4,019
>
> 4,134
>
> 4,20
>
> 8
> M6
> 1,00
>
> 4,773
>
> 4,917
>
> 5,00
>
> 10
> M8
> 1,25
>
> 6,466
>
> 6,647
>
> 6,80
>
> 13 / 14
> M10
> 1,50
>
> 8,160
>
> 8,376
>
> 8,50
>
> 17 / 16
> M12
> 1,75
>
> 9,853
>
> 10,106
>
> 10,20
>
> 19 / 18
> M16
> 2,00
>
> 13,546
>
> 13,835
>
> 14,00
>
> 24
> M20
> 2,50
>
> 16,933
>
> 17,294
>
> 17,50
>
> 30
>
>
> Greetings
> Peter
>
> Am 24.01.2016 10:18, schrieb Erik Christiansen:
>> On 23.01.16 12:27, Gene Heskett wrote:
>>> Now we are getting more precise than we can drill with the typical drill
>>> bit, which usually drills oversize because the tip flats are
>>> un-avoidably off center. Even to a small extent for pricy carbide bits
>>> in the smaller sizes. Yesterdays finished tapping looked great, but I
>>> think I could have used the next larger #drill. Yeah, my back of a
>>> napkin said a .089 drill, kcalc says 0.0984251968503937008 for a 3mm.5
>>> screw.
>>>
>>> No wonder I felt like I should peck it, the hole WAS too small.
>> Ahem, it was WAAAY too small. ;-)
>>
>> Just a glance at the table upthread shows that 2.6mm (0.102") gives 65%
>> engagement, which is as much as I ever want on M3, to avoid busting the
>> tap. Even kcalc's 2.5mm (0.098") drill is too small, giving a dangerous
>> (to small taps) 82% engagement.
>>
>> And that .089 (2.26mm) gives an engagement of:
>>
>> E = (OD - Drill_Size)/2kp
>> = (3 - 2.26)/(2*0.613*.5)
>> = 120%
>>
>> That has the tap drilling as well as tapping!
>> You did superbly to not break the tap, Gene.
>>
>> I tried a 2.5mm (0.098") drill for M3. Once.
>> Although the tap didn't break, I went straight out and bought a couple
>> of 2.6mm drills. Now I can tap M3 without my hair standing on end.
>>
>> Erik
>>
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