G11 Class fit?

[within a thou]

We just got a drawing which shows a fit on a slot of G11 for a 35mm wide slot. I cant find any information on a G11 fit only for H11 and am not sure if that is a typo or I am just not looking in the right place. Does anyone have any idea what the tolerance for the fit is? Thanks in advance for any and all help

[Guest CNC Apps Guy 1]

I thought G11 was a material. Interesting....

[Craig Madsen from CM3D]

Well, I can't find anything on 'G11' fit.

 

I think your best bet would be to 'verify' the spec with the company. - If there is a G11 spec, it would be interesting to know what it is / means.

[within a thou]

I kjnow its a British standard but am yet to find out a answer yet will keep you guys posted thanks for the help.

[Psychomill]

My guess...

 

"G" in this case should be referencing a Sliding Fit class. This is a metric standard. But G doesn't go to 11 on scales I've seen (I thought it stopped at 10). It could be that they mean a H11 tolerance or they're mixing up IT Grade with the G class and basically it's saying "G" fit with IT 11 grade for deviation.

 

Take a look at these... ANSI B4.2, ISO/R286, ISO 1829

[within a thou]

So I found this nifty little online calculator called MITCalc. (free demo available not sure if its ok to post links but if you google it should be easy enough to find). The calculator is actually a excel spreedsheet where you can input your variables pretty neat little tool actually that answered this question. There is a G11 class fit it falls under ISO 286 and for my 35MM slot the high low ranges from 35.009-35.169mm. Thanks for all the help.

 

Mat