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When is a millimetre not a millimetre?
When is a millimetre not a millimetre?
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Old 23rd August 2019, 10:42 PM   #1
nigelwright7557 is offline nigelwright7557  United Kingdom
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Default When is a millimetre not a millimetre?

Bought some 5mm pitch caps off Ali-Express.
When they came they were 7.5mm.
So fit them best I could.
On my next pcb buy I made all the caps 7.5mm pitch holes.
Then I ran out so I purchased some more 7.5mm pitch caps.
When they came they were 10mm pitch FFS.
Don't they have rulers in China ?
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Old 23rd August 2019, 10:59 PM   #2
vinylkid58 is online now vinylkid58  Canada
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When is a millimetre not a millimetre?
Quote:
Originally Posted by nigelwright7557 View Post
Don't they have rulers in China ?
I guess they ran out.

jeff
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Old 24th August 2019, 12:32 AM   #3
Michael Bean is online now Michael Bean  United States
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Quote:
Originally Posted by nigelwright7557 View Post
Bought some 5mm pitch caps off Ali-Express.
When they came they were 7.5mm.
So fit them best I could.
On my next pcb buy I made all the caps 7.5mm pitch holes.
Then I ran out so I purchased some more 7.5mm pitch caps.
When they came they were 10mm pitch FFS.
Don't they have rulers in China ?
Yep...the current one is called Xi Jinping, he's a communist.

Mike
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Old 24th August 2019, 12:45 AM   #4
synonymous is offline synonymous  United States
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Once in China, I was admiring the names they had for motorcycles, one was called "yamasaki".
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Old 24th August 2019, 12:57 AM   #5
alexberg is offline alexberg
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Well
One gets what one pays for.
Cheers
P.S. It's highly likely that seller does not have a slightest idea about ruler not mentioning inches or even millimeters.
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Old 24th August 2019, 08:41 AM   #6
MagicBus is offline MagicBus  Greece
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It was known for shoes made in China that they don't follow the western standard numbers. They would be either a little bigger or smaller...
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Old 24th August 2019, 09:46 AM   #7
nigelwright7557 is offline nigelwright7557  United Kingdom
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The item was clearly described as 7.5mm pitch.
10mm isn't 7.5mm.

Here is the sellers reply.

"POWRE MA: Buyer,the picture is not clear.can you try send again?if you mean wrong foot pitch,our shop are standard and professional product,and this size is within the error range.
Can you consult a professional engineer.i think he'll give you good advice. "

A bit cheeky considering I have been in electronics since 1980.
AliExpress refunded me anyway.
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Old 24th August 2019, 09:50 AM   #8
wintermute is offline wintermute  Australia
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When is a millimetre not a millimetre?
I think the tolerance is normally +- 0.5 mm, not +- 50% !!!

Tony.
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Old 24th August 2019, 09:57 AM   #9
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by MagicBus View Post
It was known for shoes made in China that they don't follow the western standard numbers. They would be either a little bigger or smaller...
I once bought an XXL T shirt from China, when it came it was a UK medium.
I can see how clothes sizes vary as the Chinese tend to be smaller than Europeans. But a mm is a mm and they cant argue with that.
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Old 24th August 2019, 10:22 AM   #10
merly is offline merly  United Kingdom
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Quote:
Originally Posted by nigelwright7557 View Post
A bit cheeky considering I have been in electronics since 1980.
AliExpress refunded me anyway.
Why buy parts from alieexpress when all of them are fake? I've barely been in engineering since 1995 but I know everything on alie express and ebay etc are fake. So I don't buy them.
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