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Steady Bar Issues - Bolt Sizes?


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#1 chilli1

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Posted 14 July 2019 - 11:49 AM

Hi All,

 

I rather confused as to which bolts to use for this. The car is a 1993 1275 Sprite

 

I am replacing the bushes on the standard steady bar. I have removed the bolts from the block and they look to be a coarse thread but the bolt specified on Minispares is UNF.

 

I am wondering if whoever previously fitted the polybushes to this bar used the wrong bolts? They seem to be matching my Metric 1.25 thread gauge.

 

Could they have bodged M8 bolts in there?

 

I have seen a part numbers somewhere on here for UNC equivalents of the UNF bolts for this job but can't seem to find them now.

 

Would fitting those be the best thing to do?

 

and I haven't even got to the rusted in bulkhead end yet!

 

cheers 

 

Al



#2 nicklouse

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Posted 14 July 2019 - 12:46 PM

So have you seen how the correct bolts fit?

#3 chilli1

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Posted 14 July 2019 - 09:19 PM

The correct bolts do not fit, the threads are too coarse so the UNF bolts don't screw in at all. 

 

The bolt that came out of the rear hole (the one that goes through the bush) only screws in about 10mm.  Is that correct/enough?

 

The way I see it at the moment my options are:

 

  • buy some new M8 bolts that fit the bushes properly (assuming 10mm is deep enough)
  • buy the minispares repair kit and use that instead


#4 minisilverbullet

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Posted 14 July 2019 - 10:06 PM

Maybe a thread repair in the block. As a start I would test what the original bolt thread is with a known m8 nut 



#5 nicklouse

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Posted 14 July 2019 - 10:11 PM

The correct bolts do not fit, the threads are too coarse so the UNF bolts don't screw in at all. 
 
The bolt that came out of the rear hole (the one that goes through the bush) only screws in about 10mm.  Is that correct/enough?
 
The way I see it at the moment my options are:
 

  • buy some new M8 bolts that fit the bushes properly (assuming 10mm is deep enough)
  • buy the minispares repair kit and use that instead
So they screw in. So they fit.

The fact you can’t screw it in any more than 10mm may be because the hole is only that deep. Measured it? Don’t forget there is a great big thing on the other side called a cylinder.

#6 chilli1

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Posted 15 July 2019 - 07:01 AM

I've ordered some M8s of the correct length so I'll double check the thread when they arrive.

 

Yes I measured the hole, it is 10mm deep,  I just wasn't sure if that was how deep it was meant to be or if there was the remnants of a bolt in there.



#7 KTS

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Posted 15 July 2019 - 07:55 AM

I've ordered some M8s of the correct length so I'll double check the thread when they arrive.

 

Yes I measured the hole, it is 10mm deep,  I just wasn't sure if that was how deep it was meant to be or if there was the remnants of a bolt in there.

 

just measured the depth on a block i have and they're c.18mm deep






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