M10X1.25X30 - What does it mean? - Alfa Romeo Forum
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Old 30-04-11
2spark
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Help M10X1.25X30 - What does it mean?

M10X1.25X30

Can anyone explain what these numbers mean? They are the numbers for a screw for fixing the front wishbone to the inner mount. I take it that some of these numbers refer to thread, diameter and length but which is which.

The wishbone has four of these bolts all differing in size and I want to make sure I order the right one.
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Old 30-04-11
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M10 is the nominal bolt diameter in the metric system, so its about 10mm (but always slightly less)

1.5 is the pitch, or distance between each thread, in mm. Sometimes specified as "coarse" or "fine". For an M10, 1.5 is coarse, 1.25 or 1 is fine.

30 means it is 30mm long not including the head.

Hope I've got that right

As an aside - the pitch tells you how far a bolt will move axially when you make 1 full rotation. I.e. a 1.5mm pitch bolt is pulled 1.5mm further into a hole when you turn it 360 degrees... This is useful to know for making tie-rod adjustments and that sort of thing.

Last edited by Turtle4288; 30-04-11 at 18:51.
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Old 30-04-11
2spark
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Nice one . That's a real help
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Old 30-04-11
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But it also needs to be the correct tensile strength which is usually stamped on the end of the bolt head.
Check correct part number on eper online
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Old 30-04-11
2spark
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Originally Posted by CrispDust View Post
But it also needs to be the correct tensile strength which is usually stamped on the end of the bolt head.
Check correct part number on eper online
Cheers. I will be ordering from an alfa dealer tomorrow. I know what I need now
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Old 30-04-11
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I doubt they'll be open on Sunday or Monday.....
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Old 30-04-11
2spark
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Originally Posted by CrispDust View Post
I doubt they'll be open on Sunday or Monday.....
All these bank holidays I don't know what day it is
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Old 01-05-11
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Originally Posted by Turtle4288 View Post
M10 is the nominal bolt diameter in the metric system, so its about 10mm (but always slightly less)

1.5 is the pitch, or distance between each thread, in mm. Sometimes specified as "coarse" or "fine". For an M10, 1.5 is coarse, 1.25 or 1 is fine.

30 means it is 30mm long not including the head.

Hope I've got that right

As an aside - the pitch tells you how far a bolt will move axially when you make 1 full rotation. I.e. a 1.5mm pitch bolt is pulled 1.5mm further into a hole when you turn it 360 degrees... This is useful to know for making tie-rod adjustments and that sort of thing.
Is it sad that I found this post really interesting
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Old 01-05-11
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On countersink screws, the length measurement includes the head, so that is another one to watch.
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