Does an M9 bolt size exist?
Turbo Mini Forums

I just managed to strip the thread on the nut that holds the rear subframe to the heal board/sill box section end.

I have tried all day to find a slightly bigger bold. bit of threaded bar, and even bar to make a bolt but to no avail. I now have given up on imperial and will retap the 4 nuts to metric size, But cannot find a thickness between m8 and m10, m8 being to small and m10 to large.

Does anyone have access to or know where I could get a m9 bolt as well as tap?

Thanks

5/16th unf i believe it is

none of this modern easy to work stuff

oh sorry i didnt read that your re-tapping it

Edited by Nic on 4th Sep, 2007.

Tap and helicoil?

Going M9 means pulling off all the subframe mount blocks and opening these out as well.

Of course - it is your descision.

btw - I am sure M9 does exist.

On second thought I didn't consider helicoiling it. Would that be a feasable option?

That would be a better option as it will involve less hassle.

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?Vie...em=140149259492

Proof that they exist! Not a bad price for a rare tap.

9mm does not exist per say, but are available from very specialised suppliers, in 1.25 mm pitch, you can buy a 9mm tap though . it is not classed as M9 , but 9mm fine, only the M should be applied to the standard metric threads, my old pal Norman reaslly has a big bug about this topic,


carl

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They are usually used on newer cars, vaulxhalls have this thread on their calipers.

Back once again like a renegade master

I think you mean they need 9mm allen key. The only size thats never in a set!

Edited by Jason G on 4th Sep, 2007.

Drill it out and put a rivnut in,the thread will then be behind the nut that is in there so can't go anywhere

Metro turbo weekend driver,Mini turbo in the making again!

[quote=milamber,4th of Sep, 2007 at 09:12pm]I think you mean they need 9mm allen key. The only size thats never in a set!

No theyre m9 1.25 thread on the adjusters. I know it sounds mad but we had to re thread one yesterday.

Back once again like a renegade master

If you put a metric thread on a Mini you might as well fit a BMW badge at the same time

On 5th Sep, 2011 Vegard said:
I stand corrected. You should know

I agree. Like m10 fine which is either 1.00 or 1.25.
I dont like odd number metric threads anyway. prefer even for some reason.

Back once again like a renegade master

On 4th of Sep, 2007 at 10:15pm Scruffy said:
If you put a metric thread on a Mini you might as well fit a BMW badge at the same time

Edited by Sprocket on 4th Sep, 2007.

http://www.engineeringtoolbox.com/metric-threads-d_777.html

M9 is an absolute bastard thread. Drill out and weld in new 5/16 UNF to do a proper job.

On 4th of Sep, 2007 at 10:15pm Scruffy said:
If you put a metric thread on a Mini you might as well fit a BMW badge at the same time

Metro turbo weekend driver,Mini turbo in the making again!

89 on on had metric fittings on things like the brake servo, just to be pedantic lol :)

Edited by t3gav on 5th Sep, 2007.

I often open many holes out to suit an M8 (5/16 is 7.9375mm), M10 (3/8 9.525mm) or M12 (7/16 11.1125).

Getting imperial bolts, especially in a good grade around here is almost impossible (unless you remortgage!!!)

Nothing wrong with metric stuff, and it's cheap!!!

I'd not change anything threaded (like the heal board) from imperial though as it's bound to cause you a problem when you need to get a replacement for whatever reason and you forget you changed it to metric ......

Every day is a school day ...........

How fast and how expensive ...... the same question...

Edited by fastcarl on 5th Sep, 2007.

WWW.FORCE-RACING.CO.UK PLEASE CLICK HERE

The Magic circle??
Regards
Dave