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Old 06-02-2010, 07:32 PM   #1
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Help with Screw sizes needed!


Hello Knowledgeable folk of the DIY chatroom,

I am very confused at the moment as i'm from the UK and have a set of instructions from the USA for a project I am trying to copy but the screw sizing used is in the American format and don't seem to be available here or are called something different!

I am trying to find a UK equivalent of a 1/4″-20 x 3″ round head slotted machine screw (I only need 3!) and their associated jam nut however upon searching for machine screws in the UK, I get them listed in the format M2 x 20, M6 x 50, A2 x something etc. These mean little to me. There doesn't seem to be a metric equivalent.

Can anyone here tell me what the screw I want is called in the UK (metric) format?

I would be very grateful.

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Old 06-02-2010, 07:46 PM   #2
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Help with Screw sizes needed!


1/4 inch coverts to 64 mm. 3" converts to 7.62cm. I think that would be about an M6 x 8.

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Old 06-02-2010, 07:57 PM   #3
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Help with Screw sizes needed!


Hey finally something I'm good at ( long time toolmaker)


A 1/4-20 x 3" ...

.= .250 thousands diameter by 20 threads per inch by 3 inches long

There is no direct equivalent but a

M6 X 1 x 75 may work although its a little undersize in diameter and that your going though a clearence hole and not trying to match with SAE threads

a

M6 = 6MM dia (.236" dia) by pitch of 1 x 75 MM long

1 MM = .0937" ( inches)

1 inch = 25.4 MM


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Old 06-02-2010, 08:02 PM   #4
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Help with Screw sizes needed!


Great stuff guys, many thanks for your help.
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Old 06-02-2010, 09:27 PM   #5
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Help with Screw sizes needed!


Quote:
Originally Posted by andyroo77 View Post
I am trying to find a UK equivalent of a 1/4″-20 x 3″
means 20 threads/inch.
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Old 06-02-2010, 10:00 PM   #6
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Help with Screw sizes needed!


This may help.
Attached Files
File Type: doc Fastener Conversion Chart.doc (36.5 KB, 55 views)

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