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Plating

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hockeyb

hockeyb

Mechanical
Joined
Aug 10, 2005
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3
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What is a standard thickness tolerance on yellow zinc dichromate plating for fasteners (tread)
 
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Zinc plating plus yellow chromate is commonly specified as 9 micrometers minimum thickness. It can be as low as 5 micrometers if the corrosion requirement is low or as high as 25 micrometers when greater corrosion resistance is required.
 
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If 9mm is the standard min. what is the standard max.?

I don't want to spec something out of the norm
 
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Woops, sorry

Is there a standard max?
 
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No, there is not a standard maximum. One GM standard limits the maximum to be twice the minimum thickness.
 
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