How to Determine Thread Diameter and Pitch
Thread Starter
Safety Car
Joined: Dec 2001
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From: Indianapolis Indiana
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How to Determine Thread Diameter and Pitch
Guys, I need to make a custom coupling and order the parts from the McMasters catalog.
Problem is, I don't know how to determine exactly what thread pitch and diameter I need to match the studs which are used to bolt the the seats down.
Any practical advice?
Problem is, I don't know how to determine exactly what thread pitch and diameter I need to match the studs which are used to bolt the the seats down.
Any practical advice?
Race Director
Joined: Oct 2002
Posts: 16,477
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From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
Not sure what you mean by "custom coupling"...but for the stud you pictured...take that nut off. head to a hardware store, and find the bolt that threads into it freely. This will tell you what thread/pitch it is. It will likely be metric.
For what the other part of the "coupling" may be...I can't help you there.
For what the other part of the "coupling" may be...I can't help you there.
Thread Starter
Safety Car
Joined: Dec 2001
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From: Indianapolis Indiana
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Originally Posted by Patches
I believe that is 10 mm x 1.5 mm
Supporting Vendor
Joined: Aug 2003
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From: Beautiful CO
St. jude Donor '14
Originally Posted by Patches
That is thread size. 10 mm is the thread diameter and 1.5 mm is the thread pitch.
Burning Brakes
Joined: Aug 2000
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From: Morganton, NC, USA
You can buy single inch and metric hardware store nuts pretty cheap and try each to see which fits. Just make sure you mark them well. And to be sure, you need to try them on properly identified hardware store bolts. With bins of loose fasteners, they are always getting wrong ones mixed in. Most likely the stud will be a standard metric thread. Before metrification of US autos, a lot of body bolts had non-standard pitches, but hopefully this is not the present practice.
Thread Starter
Safety Car
Joined: Dec 2001
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From: Indianapolis Indiana
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Originally Posted by Elite Engineering
Here is the McMaster-Carr part number for the nut in stainless steel 91828A415
Just I know what I'm doing (apologies for the remediation):
- M10 means the thread diameter is 10mm (doesn't that seem a little large?)
- I didn't see much relating to whether these bolts were 1.5mm thread pitch. I believe the 1.5mm is just how far they move in one turn, but is that just a very standard thread pitch?
I think I've almost got it straight.
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