M10X1.25X30 - What does it mean? - Alfa Romeo Forum
You are currently unregistered, register for more features.    
 
Thread Tools Search this Thread
2spark
Status: - Update
Guest
 
Posts: n/a
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.
 
Sponsored Links
Advertisement
 
Status: GTV for sale ...
AO Silver Member
 
Join Date: Jan 2011
Location: United Kingdom
Posts: 1,842

Member car:

GTV 2.0

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.
Turtle4288 is offline  
2spark
Status: - Update
Guest
 
Posts: n/a
Nice one . That's a real help
 
Status: -
AO Silver Member
 
Join Date: Mar 2005
Location: Leeds England
Posts: 2,220

Member car:

GTV V6, ex 166er

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
CrispDust is offline  
2spark
Status: - Update
Guest
 
Posts: n/a
Quote:
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
 
Status: -
AO Silver Member
 
Join Date: Mar 2005
Location: Leeds England
Posts: 2,220

Member car:

GTV V6, ex 166er

I doubt they'll be open on Sunday or Monday.....
CrispDust is offline  
2spark
Status: - Update
Guest
 
Posts: n/a
Quote:
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
 
Status: 404 - Alfa notfound
AO Member
 
batwad's Avatar
 
Join Date: Apr 2008
Location: United Kingdom
Posts: 324
Quote:
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
batwad is offline  
Status: On Alfa number 15
AO Platinum Member
 
symon's Avatar
 
Join Date: Dec 2005
Location: United Kingdom
Posts: 31,123
Images: 13
On countersink screws, the length measurement includes the head, so that is another one to watch.
symon is offline  
Reply

Go Back   Alfa Romeo Forum > Supported Alfa Romeo Models > Technical & Vehicle Assistance > Alfa GTV & 916 Spider

Tags
mx30

Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome