Hole sizes vs Thread sizes

[Carl]

What size hole should I use with .8 mm thread?

 

Thank you

[jimi]

Hi there,  there are 4 sizes,Check out the chart. https://www.custompartnet.com/tap-size-chart

[fredk]

3 hours ago, Carl said:

What size hole should I use with .8 mm thread?

0.5 to 0.8 mm, depending on your thread. I use flat profile thread and its best in 0.5 / 0.6 mm holes

[Carl]

Thank you guys very much!

 

[fredk]

On 7/12/2020 at 4:26 PM, Carl said:

What size hole should I use with .8 mm thread?

 

On 7/12/2020 at 7:50 PM, fredk said:

0.5 to 0.8 mm, depending on your thread. I use flat profile thread and its best in 0.5 / 0.6 mm holes

Sorry, I must qualify that. 

I like 0.6 mm when its a single thread doing a running stitch but 1.2 mm approx if its a double thread in a saddle stitch

If its a normal round thread, 0.6 mm to 0.8 mm hole for a single thread. The thread will squeeze down a bit and the leather will expand a wee bit so the thread will fill the hole. Approx 1.5 to 2 x for double thread in a saddle stitch

It will take more of a pull to take the thread through the smaller hole but if its kept well waxed it'll slip through well enough

[Carl]

Good information.  Thank you

[rodneywt1180b]

On 7/12/2020 at 10:41 AM, jimi said:

Hi there,  there are 4 sizes,Check out the chart. https://www.custompartnet.com/tap-size-chart

That chart is for screw threads.

[Northmount]

Here is a cahrt for sewing machine needles and thread that might help you.

https://www.tolindsewmach.com/thread-chart.html

Tom