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308 posts

Ultimate Geek
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Topic # 243744 29-Dec-2018 17:42
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So I have a little jig from the USA and the 1/2 inch long machine screws are not long enough to fit my application so I'm looking for 1inch long pan head machine screws - size 8 with 32 threads.  Can i find them ? Nope.

 

Don't need stainless - think I've found them at anzor.. Just cheap and cheerful steel or zinc coated steel etc.  I can find lots of 5/32 and even found some 5/32 at Mitre 10 but they are a fraction loose. 

 

I can order them by the bucketload from overseas but local would be good - Christchurch first followed by NZ next. Appreciate they may not open until Jan but any pointers appreciated.

 

Thanks

 


Ged

 

 


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  Reply # 2151972 29-Dec-2018 18:35
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The sizing at mitre10 is some oddball one based on inches, its not actually a 5-32 screw. The little packs of zenith screws are a pain, since they dont seem to convert to any standard non metric sizes. Im guessing they are based on some old english screw sizes or something. The 1/4 inch one is the only one that has worked for me as a tripod screw but it seems to be cut differently.

 

I had a similar problem when I ordered some brackets and it said that it used a normal 6-20 or something, So I went and got some M6 screws before the brackets arrived and oh what a suprise when they were way too big and didnt fit and they meant something else.

 

I do recall getting some bastard inch size rack screws and bolts with my unifi switch, which I foolishly used in the rush to put it in and then found that I couldnt put my nice hex head screws in once I found my jar of them, so perhaps someone will have some sitting around that came with some gear?





Richard rich.ms



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Ultimate Geek
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  Reply # 2151979 29-Dec-2018 18:50
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Yeah. Ive been reading up on SAE, Imperial, UNC and Metric. Still none the wiser other than manufacturers / retailers here seem to mix them up :)


 
 
 
 


64 posts

Master Geek
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  Reply # 2151982 29-Dec-2018 19:03
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I think 8-32 is one of the US screws used in electrical (and probably everything else). First number is the gauge (diameter), larger number is larger. Second number is threads per inch.

 

A standard NZ flushbox screw is 6-32. Might fit ish?




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Ultimate Geek
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  Reply # 2151986 29-Dec-2018 19:18
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Hi. Thanks for that. Re the flushbox screws - are you talking about the faceplate screws ?  Just tried one of them and it basically goes through the brass nut - it appears a good bit ' thinner' in diameter than the current 5/32's I have that are a little loose.

 

 

 

Having said that I just found these at bunnings which backs up what you just told me. Wierd......

 

 

 

https://www.bunnings.co.nz/hpm-6-32-american-screws-76mm-10-pack_p00155182


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Master Geek
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  Reply # 2152010 29-Dec-2018 21:39
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Try Black's Fasteners or Konnect (formerly Hylton Parker).

 

Bunning's or Mitre 10 may have small (overpriced) packets of 8-32 machine screws but that's a long shot. 

 

You are not going to find a satisfactory substitute.  You need the real thing. This is not a matter of driving a nut, when an 8 mm driver may substitute for a 5/16" or an 11 mm for a 7/16".  Screw threads are much more finicky.

 

 




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Ultimate Geek
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  Reply # 2152019 29-Dec-2018 21:53
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Thx Kiwigander. Been to M10 and the closest they had was the 5/32 at 40c each.  Threads are good but the screw size is a fraction too small. I can bodge it with some ptfe tape on it to make it work in the interim ( I have discovered).  

 

As per previous poster's advice - the 6/32 electrical box screws don't appear to be sized as such.

 

The screw size is smaller than the 5/32 that I already have. I'm assuming the 6 should technically be bigger. So either the 5/32 from M10 are the wrong size or bunnings have marked their electrical box screws incorrectly. 

 

 

 

I'll try those other shops you recommended. Thanks again


206 posts

Master Geek
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  Reply # 2152021 29-Dec-2018 21:57
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Can you re-tap the holes with a metric thread? Maybe drill them out a little larger to remove the old thread?

A pox on Imperial threads.

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  Reply # 2152025 29-Dec-2018 22:12
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irongarment: Can you re-tap the holes with a metric thread? Maybe drill them out a little larger to remove the old thread?

A pox on Imperial threads.

 

They are not imperial, they are UNC or UNF.





Richard rich.ms



308 posts

Ultimate Geek
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  Reply # 2152028 29-Dec-2018 22:18
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This is what I've got

 

https://www.microjig.com/products/zeroplay

 

Not a lot of brass left to drill out and retap and I'd rather just find the correct machine screws cheers

 

 


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Master Geek
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  Reply # 2152030 29-Dec-2018 22:24
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richms:

irongarment: Can you re-tap the holes with a metric thread? Maybe drill them out a little larger to remove the old thread?

A pox on Imperial threads.


They are not imperial, they are UNC or UNF.



Is that metric UNC and UNF, or Imperial?

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Master Geek
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  Reply # 2152035 29-Dec-2018 22:44
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UNC and UNF are not metric and are not Imperial.  They are American.

 

The non-metric American and British systems of measurement are similar but critically different.

 

Example:

 

US gallon = 4 US quarts = 128 US ounces = 3.785 litres (approximately)

 

Imperial gallon = 4 Imperial quarts = 160 Imperial ounces = 4.546 litres (approximately)

 

And no, I haven't committed a transcription error; the US and Imperial ounces are not the same either.

 

With respect to the present discussion, Google UNC, UNF, BNC, BNF and Whitworth threads.


500 posts

Ultimate Geek
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  Reply # 2152037 29-Dec-2018 23:28
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Just go to AliExpress.


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  Reply # 2152039 29-Dec-2018 23:35
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Also the half inch size screws are different. I ended up getting mine from a place in wairau valley somewhere. The guy at mitre10 put me onto them, archers or target roads - around that area.





Richard rich.ms

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Master Geek
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  Reply # 2152093 30-Dec-2018 09:45
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kiwigander:

UNC and UNF are not metric and are not Imperial.  They are American.


The non-metric American and British systems of measurement are similar but critically different.


Example:


US gallon = 4 US quarts = 128 US ounces = 3.785 litres (approximately)


Imperial gallon = 4 Imperial quarts = 160 Imperial ounces = 4.546 litres (approximately)


And no, I haven't committed a transcription error; the US and Imperial ounces are not the same either.


With respect to the present discussion, Google UNC, UNF, BNC, BNF and Whitworth threads.



Yes, I know that, but the inch is the same.

Fine. A pox on American threads. Metric system FTW!

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