5/32 unc 1 3/4 inch bolts or threaded bar. Need help.

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5/32 unc 1 3/4 inch bolts or threaded bar. Need help.

This topic has 22 replies, 4 voices, and was last updated 30 May 2010 at 22:21 by Gavin Marshall.

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9 May 2010 at 14:18 #51539
Gavin Marshall
Participant
@gavinmarshall90568
Hi, Everyone.

I’m having problems trying to find these bolts or threaded bar. Can anyone point me in the right direction. Thanks in advance.

Gav.
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9 May 2010 at 14:18 #5058
Gavin Marshall
Participant
@gavinmarshall90568
9 May 2010 at 14:45 #51542
JasonB
Moderator
@jasonb
Don’t think it exists

Smallest measured UNC is 1/4″ and below that its numbered and there is not a size equal to 5/32″ it will have to be the smaller 6-32 @ 0.138″ or the larger 8-32@ 0.164.

Either way you will have a job finding it here, better off in the USA.

M4 would be the best bet for off the shelf studding, bolts a bit harder to find, virtually the same dia but a bit finer thread.

Jason

Edited By JasonB on 09/05/2010 14:53:22

Edited By JasonB on 09/05/2010 14:53:51
9 May 2010 at 15:43 #51544
Gavin Marshall
Participant
@gavinmarshall90568
Hi

Thanks for the reply the other sizes you mentioned would these fit the thread
9 May 2010 at 16:11 #51546
JasonB
Moderator
@jasonb
No

Although the diameter is only a few thou larger the pitch at 0.7mm gives 36tpi and not 32.

As the thread does not actually exist can you post the details of what you have got as it must be something other than UNC. eg overall diameter ( to nearest 0.001″), pitch or tpi, thread angle though it may be a bit small to be exact

Jason
9 May 2010 at 17:18 #51552
JasonB
Moderator
@jasonb
You can get a 5/32″ x 32tpi cycle thread but you will have to make your own studding/nuts & bolts. The thread form is a little bit different but I think that will be as close as you are going to get.

Tracy tools will have suitable taps & dies
9 May 2010 at 17:40 #51553
Gavin Marshall
Participant
@gavinmarshall90568
Hi

I don’t raly have all that information a bit technical for me. I went to an engineering suppliers. they had a 3/4 inch hexhead bolt with the same thread but told me that was the longest they could get, so it definetly is available it’s just the length.

They were the ones that told me it was a 5/32 unc.

Can you tell me where I can get the cycle threads all I need is the threaded bar.

What it is for is I have archery arrow inserts and want to cut them into three and join them with the bar. Thanks a lot for the help.
9 May 2010 at 17:56 #51555
Gavin Marshall
Participant
@gavinmarshall90568
Hi

It’s 32 tpi
9 May 2010 at 17:58 #51556
JasonB
Moderator
@jasonb
Well a quick Google of “Threaded arrow Inserts” would seem to indicate that the thread is 8-32 UNC as I first suggested and not the non existant 5/32″ UNC.

You will have a job finding studding (threaded rod) this size in teh UK. Bolt wise Modelfixings only do cap head bolts upto 1 1/2″ long in that thread but maybe if you now do some searching for 8-32UNC you will turn something up.

The other alternative is to buy a die and cut your own thread on some 4mm rod which although a little small on diameter should be OK.

You can buy the dies here

Jason
9 May 2010 at 18:21 #51557
Gavin Marshall
Participant
@gavinmarshall90568
Hi

Thanks , so that’s the problem. I was going on what the shop guy told me. I’ll check for some bar if not i’ll do my own. Thanks for all the help your a star.
9 May 2010 at 19:43 #51561
Gavin Marshall
Participant
@gavinmarshall90568
Hi

Found it here.http://www.lancasterthreaded.com/html/standard_products_-_threaded_r.html#LowCarbonSteelRodUNC. Cheers.
9 May 2010 at 19:49 #51563
JasonB
Moderator
@jasonb
They are in the US, hope postage is not too high, I’m assuming you are in teh UK?

Jason
9 May 2010 at 20:17 #51565
Terryd
Participant
@terryd72465
Meccano threaded rod and nuts are 5/32 BSW and is available relatively cheaply from the online suppliers. Whitworth threads are often substituted by UNC so I see no problem with using this Meccano standard Whitworth.

There are taps and dies available at decent prices off he internet. For the threaded rod (studding) up to 11 1/2″ long, look for part numbers 78 onwards depending on the length you need. You can get both square nuts (which is a traditional shape for antique models) or Hex nuts.

I have used this guy for Meccano stuff, He is fair, honest and has good prices and postage:

http://www.meccanohobby.co.uk/

Also:

http://meccanoman.co.uk/catalog/index.php?cPath=1_39

He has a wider range but more expensive.

5/32 Whit Taps etc from:

http://www.modelfixings.co.uk/bsw_taps.htm

My only connection with these guys is as a very satisfied customer.

Best regards

Terry
9 May 2010 at 20:18 #51566
Terryd
Participant
@terryd72465
p.s.

Meccano stuff is also available in the USA if that’s where you are situated, There are suppliers there, just Google them.

Terry
9 May 2010 at 21:15 #51567
Gavin Marshall
Participant
@gavinmarshall90568
Hi,

Did’nt realise they were in the u.s. I’ll try the meccano threaded bar then thanks for the links. The closest i got was 1 1/2 inch hex head bolts which would do as I’m gonna epoxy one end but there 49p each, but I’d rather it was the full length.
9 May 2010 at 21:24 #51569
Terryd
Participant
@terryd72465
Let me know how you get on.

Most Meccano stuff is now second hand and traded by specialist dealers for collectors.

Terry
9 May 2010 at 21:28 #51570
Terryd
Participant
@terryd72465
The guy on the first link has screwed rod at 3 1/2″ long (part No 80a) for 50p. Not sure if he’d ship to theStates but I think he would, if you have difficulty and struggle to find some let me know I can probably find you some amongst my collection. In fact I know I can The Airmail would be negligible.

Just email me.

Best regards

TerryD

Edited By Terryd on 09/05/2010 21:30:56
9 May 2010 at 22:01 #51571
Gavin Marshall
Participant
@gavinmarshall90568
Hi Terryd

I live in Sunny Dagenham, Thanks for the offer. I just picked up a few bits on ebay.

Hope they fit.
9 May 2010 at 22:45 #51572
Terryd
Participant
@terryd72465
Glad to hear that . You should have said, I’d have popped a length of screwed rod with some nuts into the post tomorrow. Never mind, Let us know how you get on.

Best regards

Terry
12 May 2010 at 06:49 #51647
Terryd
Participant
@terryd72465
Would be interested to know how you get on with the screwed rod. let us know whether success or failure.

Terry
12 May 2010 at 10:15 #51651
KWIL
Participant
@kwil
AHC in Camberley Surrey are a mine for sort after threaded items of all descriptions.
12 May 2010 at 13:43 #51654
Gavin Marshall
Participant
@gavinmarshall90568
Hi

Got the meccano bar fits lovely. I’ll be taking a few pics later and I’ll put them up.

Thanks again for all the help.

Gav
30 May 2010 at 22:21 #52292
Gavin Marshall
Participant
@gavinmarshall90568
Hi

It’s been a while. used the mecanno bar in the end here’s a pic. Thanks again for all the help.
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