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Old 09-30-2014, 11:28 AM   #1
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Default NA Part # Question (HELP!!!!)

So, I'm in the process of replacing all of the hardware in the front suspension on my '90 (see build thread).

I ordered all of the parts through Rosenthal; however, it became apparent post-shipment that the 28-091 nut is not shared between the upper and lower control arms (duh!). I can't for the life of me find the nut in Rosenthals database. A call yielded no further clues.

I'm looking for this guy:



Thanks in advance,
Zach
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Old 09-30-2014, 11:41 AM   #2
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Alternative request:

Can anyone confirm whether the upper control arm bolt thread is m14? My thread gauges unfortunately stop at m12.

Worst case, I go McMaster-Carr/Fastenal for the nut, though, I'm not sure they'll have class 10.9 locking nuts, particularly if it's 1.5 (fine) thread pitch.

-Zach
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Old 09-30-2014, 11:51 AM   #3
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...so McMaster-Carr only has Class 8 (apprx to SAE grade 5).

Part of me thinks "eh, it shouldn't see high loads."

The other of me thinks "No, idiot"

-Zach
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Old 09-30-2014, 07:59 PM   #4
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A Spec Miata forum resolved the issue.

M14 w/ 1.5 thread spacing. Case closed.
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Old 09-30-2014, 08:16 PM   #5
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Fun fact, this is the only bolt and nut that I've found on the miata that use standard ISO specs rather than JIS. If this was a JIS bolt and nut the wrench would be 19mm instead of 21mm.
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Old 10-01-2014, 11:36 AM   #6
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Quote:
Originally Posted by Leafy View Post
Fun fact, this is the only bolt and nut that I've found on the miata that use standard ISO specs rather than JIS. If this was a JIS bolt and nut the wrench would be 19mm instead of 21mm.
That is a fun fact.

Fortunately for me, BelMetric is 15 minutes away from my employers. M14 fine threaded conical locking 10.9 flange nut ... in stock ... for $1.45.

-Zach
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Old 10-01-2014, 11:42 AM   #7
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I wish I was closer. At least my local hardware store carries most sizes of JIS hardware.
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