Size of Square files ?

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Jul 13, 2009
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I have a question.

I will have to buy some new square files for a project, basically making a 3/8" round hole into a 3/8" square hole.


I have some tiny fine triangular files I used to do it once, but it was a pain.
I'm definitely going bigger and coarser

I'm going to go with a Bastard, a second cut and smooth square file set.

My local suppliers have them in warehouse a day or two away, but I'd like to eyeball them before I commit to buying them.


The trouble is that they are measured by length 4", 6",8", 10", 12" and so on.
I can't find any cross reference to their widths.

My question is:
with regards to square files, what length comes in to just fit inside a round 3/8" hole ?

3/8" across the flats will be too big in the round hole it's a corner to corner measurement.
 
This may not be super helpful but I always buy Grobet files. The exact dimensions are clear to understand. The files are not cheap but I find them to be excellent. I file a lot of hard materials like titanium etc and they hold up very well.
 
I hope it was ok to link to them, I was not deal spotting just trying to link to the information.
Delete if inappropriate.
 
Big Chris said:
This may help
http://www.mcmaster.com/#hand-files/=m9n97p

If you do this regularly what about a square broach
http://www.mcmaster.com/#broaches/=m9n9qh
Click to expand...

I know about broaches and I have one on my wish list, but a file is 1/10th the price.
If it becomes a regular thing I will definitely do that.


Thanks for the MMC link I didn't check there

file_zpsac1742b7.jpg



Now I just have to do this math
http://mathcentral.uregina.ca/QQ/database/QQ.09.04/bob1.html



I'm going to give 8" a shot.
 
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