I’m trying to find a chart that will tell me the right size drill to use before threading it. I tried Machinery’s hand book, but can only find SAE data, not metric. I’m sure it must be there, but I haven’t been able to find it. Also something larger in size I could print out and laminate then put on the wall would be best. Any ideas?
Thanks
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You might need a desk top confuser and printer--
Do a quickie search for 'metric drill & tap chart' then click 'images'
About a hundred of them pop right up.
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GONRA sez take the Metric Screw Diameter (mm) subtract the PITCH (mm).
SHOULD be a nice "tap drill diameter (mm).
Starett and Cleveland twist drill still make the wall charts. In Starrets web site they are under the school things. Both are free for the asking Starttets is lighter plastic type paper and the Cleveland are A nice stiff plastic. ask for 2 as they are double sided. Grizzly sells a reprint of the old south bend chart in the blue print style.
They arnt as nice s the old metal charts but re good. I have a Standard Twist deill thts metal in almost new condition in my shop also.
Here is a metric option up to M68x6... HTH! https://www.lexcocable.com/media/pmv...size_chart.pdfOriginally Posted by GregLaROCHE
Bill
Greetings,
Metric threads are the easiest to calculate.
Example...
M6x1 thread needed. Subtract 1 from 6 = M5 tap drill.
M3x0.5 thread needed. Subtract 0.5 from 3 = M2.5 tap drill.
Cheers,
Dave
So does the Old Coach (uscra112)
Cognitive Dissident
...late, but maybe can help:
if some better/specific view of the ruler or some translation is needed, please ask and I will try
Attachment 299562Attachment 299563
Last edited by wilecoyote; 04-28-2022 at 02:43 AM.
Food is overrated. A nice rifle is way more important.
Rob
starrett used to print a real nice wall poster they used to give out at MSC store. they probably charge for them these days.
There are FREE charts all over the net. Won't work on your silly smartphone, but if you PRINT them off, they work very well. Use heavy weight paper and laminate for longer use.
The net is your leeeeeetle friend. Youn can search for just about anything and find thousands of answers.
"So does the Old Coach (uscra112)"
Wow worked with metric threads for years and didn't know this.
THANKS
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