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Re: Standard of plug gage for M3.5 x 0.6-6H under ASME Y14.5
Re: Standard of plug gage for M3.5 x 0.6-6H under ASME Y14.5 -- Fred	Post Reply	Top of thread	Forum

Posted by: traingdt ® 01/18/2005, 14:44:35 Author Profile Mail author Edit

My experience with screw threads is very limited, so I'm not completely sure, but I would think that it's OK to use the ISO 1502 standard for guidance on gaging of screw threads. There is also a standard B1.2 for gaging Unified Inch threads, but you're talking about metric. I know for sure that the ASME Y14.5 does not reference any standard in particular for the gaging of metric threads, so I guess your dispute is legitimate. I await other replies...

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Re: Standard of plug gage for M3.5 x 0.6-6H under ASME Y14.5
Re: Re: Standard of plug gage for M3.5 x 0.6-6H under ASME Y14.5 -- traingdt	Post Reply	Top of thread	Forum

Posted by: Cragyon ® 01/18/2005, 20:19:44 Author Profile Mail author Edit

Is the drawing refering to a gaging standard, or with respect to where the tolerance of position, orientation or datum reference for the thread is to be applied?  Paragraph 2.9 of the ASME standard specifies the orientation, position, or datum reference applies to the thread derived from the pitch cylinder.  The exception being that Major or Minor Dia may be specified as an alternative.

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Re: Standard of plug gage for M3.5 x 0.6-6H under ASME Y14.5
Re: Re: Standard of plug gage for M3.5 x 0.6-6H under ASME Y14.5 -- Cragyon	Post Reply	Top of thread	Forum

Posted by: Fred ® 01/19/2005, 19:55:51 Author Profile Mail author Edit

Thanks for reply. The dispute is over what standard of threaded plug gage to use when checking GO-NO GO for M3.5 x 0.6-6H. This thread is formed by roll tap in a blind hole follow by zinc plating. As thickness specified at minimum 7 micron, plating house can only controlled such thickness from 7 to 10 micron. When i checked the plated part with ANSI H28, i have no problem to turn in the GO side of gage but part failed quality check when later ISO standard was used. We later use commercial screw and it turns in freely. So, there must be some tolerance differences between an ANSI standard gage and ISO gage standard. Does ASME specify the major, minor and effective diameter of a metric thread like the above?

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Re: Standard of plug gage for M3.5 x 0.6-6H under ASME Y14.5
Re: Re: Standard of plug gage for M3.5 x 0.6-6H under ASME Y14.5 -- Fred	Post Reply	Top of thread	Forum

Posted by: workman ® 01/22/2005, 05:08:34 Author Profile Mail author Edit

Is this part  Heat Treated ? Testing before and after?

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Re: Standard of plug gage for M3.5 x 0.6-6H under ASME Y14.5
Re: Re: Standard of plug gage for M3.5 x 0.6-6H under ASME Y14.5 -- workman	Post Reply	Top of thread	Forum

Posted by: Fred ® 01/22/2005, 05:29:41 Author Profile Mail author Edit

The part is zinc plated. But issue is not on plating thickness. Question is standard to follow for inspection of thread after plating.

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