Can someone please ID this bolt size? (part 99724-1010, lower alternator) - Miata Turbo Forum - Boost cars, acquire cats.

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Old 06-13-2014, 01:49 PM   #1
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Default Can someone please ID this bolt size? (part 99724-1010, lower alternator)

It is the lower alternator bolt. It seems the stupid PO put too long of a bolt in so it just bottoms out without clamping the alternator down. This causes the alternator to be crooked and is destroying the bearings.

I just need the thread size/length so I can go to the hardware store.

Thanks guys and gals!
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Can someone please ID this bolt size? (part 99724-1010, lower alternator)-miata.jpg  
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Old 06-13-2014, 02:14 PM   #2
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Generally the part number is the size.

Does M10x10mm sound like the right size?

That would make the adjuster bolts (0880 and 0835) M8x80mm and m8x35mm. You could check a few other bolts and their part numbers to see if that system works, but I think Mazda applied it to Miata parts.
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Old 06-13-2014, 02:19 PM   #3
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From what I understand, the naming convention is such that the last 4 digits of your part number is your bolt size.

Quote:
part 99724-1010
I believe the first two digits (in this case "10") suggest that this is an M10 bolt. I believe that the last two digits (in this case also "10") suggest that this should be a 10mm bolt. Unfortunately, that 10mm length seems unreasonably short for a M10 bolt - which throws off the whole convention thing. Perhaps it should be a 100mm bolt? I can't picture the bolt in question in my head - on the NA cars, there is an alternator bolt that seems like it was 150mm long.

The bolt on the chart above it is a 1020 Bolt, I would think 20mm would be about the minimum length to secure a stamped metal bracket to a cast metal part.
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Old 06-13-2014, 02:45 PM   #4
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It has to be at least 100mm long... hm M10 does sound right. I'll just buy a couple different lengths.
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Old 06-14-2014, 12:04 PM   #5
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Here's a whack idea: cut down the bolt that you have!
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Old 06-14-2014, 01:14 PM   #6
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Quote:
Originally Posted by DaveC View Post
Here's a whack idea: cut down the bolt that you have!
It is a whack idea, because his current bolt obviously has a shank to it. That's why it's bottoming out before it's tight and cutting it down wouldn't help... unless you want to run a die over it and thread the shank which sounds like a lot more work than getting the proper hardware.
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