4BA or 5BA

This topic has 14 replies, 8 voices, and was last updated 24 July 2020 at 22:20 by Baz.

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23 July 2020 at 14:14 #27532
Garry Coles
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@garrycoles69390
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23 July 2020 at 14:14 #487232
Garry Coles
Participant
@garrycoles69390
Hi, I'm building the 2in scale D & NY Traction Engine and I want to make the cylinder studs, which the drawings state are 5BA that go into the boiler barrel in phospher bronze. But I can only find PB in 4BA size. Will this one size smaller be OK. There are in total 24 studs.

Thanks

Garry
23 July 2020 at 14:18 #487233
SillyOldDuffer
Moderator
@sillyoldduffer
Good news! BA numbers run in reverse, so 4BA (3.6mm) is bigger and stronger than 5BA (3.2mm). Provided there's space to fit bigger studs, should be fine.

Dave
23 July 2020 at 14:59 #487238
Clive Brown 1
Participant
@clivebrown1
5 BA is almost exactly 1/8". Plenty of that available if you wish to stay to drawing.
23 July 2020 at 16:18 #487248
Garry Coles
Participant
@garrycoles69390
OOPS ! I got the sizes back to front. I meant to say that the drawings say 4BA and I can only find PB in 1/8 5BA size.
23 July 2020 at 16:21 #487249
Harry Wilkes
Participant
@harrywilkes58467
Hi Garry dont know if your talking about threaded rod or studs ? Studs are better here's a link

to 5BA by 1" steel studs if they are of use to you

H
23 July 2020 at 16:54 #487255
Baz
Participant
@baz89810
Buy some 5/32 or 3/16 diameter bronze and turn it down, should be able to do it in one cut.
23 July 2020 at 16:58 #487256
Brian H
Participant
@brianh50089
I'd be surprised if this company cannot help;

**LINK**

Brian
23 July 2020 at 16:58 #487257
duncan webster 1
Participant
@duncanwebster1
If there's room use M4, but the nuts are a tad bigger, so check first
23 July 2020 at 18:09 #487264
Harry Wilkes
Participant
@harrywilkes58467
Posted by Brian H on 23/07/2020 16:58:10:

I'd be surprised if this company cannot help;

**LINK**

Brian

Good suggestion Brian but I think you'll find EKP have reduced the range of studs they used to offer

H
23 July 2020 at 19:54 #487273
Garry Coles
Participant
@garrycoles69390
Thanks everyone for your replies. I've already made up some 4BA steel studs but I wanted to use PB to get away from the corrosion of steel to the studs. I was going to use Stainless steel in the beginning, but some one said that's a no go for copper boilers!
23 July 2020 at 21:07 #487278
Harry Wilkes
Participant
@harrywilkes58467
No stainless is not recommended for boiler studs and as far as using PB I would suggest steel is more commonly used

H
23 July 2020 at 22:19 #487291
Garry Coles
Participant
@garrycoles69390
Well in the end I think I will stick to using the steel studs I have already. Thanks everyone.
24 July 2020 at 21:57 #487460
Tim Stevens
Participant
@timstevens64731
What is the problem with Stainless for this sort of job, then?

Tim
24 July 2020 at 22:20 #487465
Baz
Participant
@baz89810
Would have thought that stainless or bronze would be far better than steel, steel rusts doesn’t it?
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