Washers.. m8.. m10 etc

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An M10 washer is one that will pass over a 10mm thread, so in effect the hole in the middle is a fraction larger.
There is a formula that governs the washer diameter compared with the hexagon nut that compresses it - I forget the exact equation but the washer is meant to be about 10% bigger than the hexagon point.
Large washers - which are meant to spread the load - are called 'penny' washers because of their oversize diameter. So, your 8 x 25 will be 25mm in diameter.
Time to polish the anorak! This is the sort of things we had to know to become a member of the 'Institute'.......! :confused:
John :)
 
I see thanks..

so with the m8x25.. is that for an 8mm internal thread?
 
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An M10 washer is one that will pass over a 10mm thread, so in effect the hole in the middle is a fraction larger.
There is a formula that governs the washer diameter compared with the hexagon nut that compresses it - I forget the exact equation but the washer is meant to be about 10% bigger than the hexagon point.
Large washers - which are meant to spread the load - are called 'penny' washers because of their oversize diameter. So, your 8 x 25 will be 25mm in diameter.
Time to polish the anorak! This is the sort of things we had to know to become a member of the 'Institute'.......! :confused:
John :)

is that the institute of washers and nuts and bolts and stuff?
 
An M10 washer is one that will pass over a 10mm thread, so in effect the hole in the middle is a fraction larger.
There is a formula that governs the washer diameter compared with the hexagon nut that compresses it - I forget the exact equation but the washer is meant to be about 10% bigger than the hexagon point.
Large washers - which are meant to spread the load - are called 'penny' washers because of their oversize diameter. So, your 8 x 25 will be 25mm in diameter.
Time to polish the anorak! This is the sort of things we had to know to become a member of the 'Institute'.......! :confused:
John :)

is that the institute of washers and nuts and bolts and stuff?

Whey hey thats near enough.....a member of institute of mechanical engineers (mechies) is a bit closer :D
John :)
 

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