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Threading a bar for 6ba

Threading a bar for 6ba

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3404607/02/2019 16:07:32
350 forum posts
2 photos

I need to thread some bar 6 ba,

The tables give the outer diameter of a 6 ba screw as 0.11 inch or 2.794mm.

Is this the bar size I use please ?

I ask as I cannot find a table which tells you what size bar to use.

Thanks

Bill

Howard Lewis07/02/2019 16:15:20
1812 forum posts
2 photos

The Model Engineer's Handbook, Third Edition, by "Tubal Cain" gives the top diameter of 6 BA as 0.1102" or 2.80 mm, so you should be OK with 0.110"

Howard

Clive Brown 107/02/2019 16:39:16
214 forum posts
5 photos

Bill,

Have you considered buying 6BA threaded rod? Rather less hassle than DIY if you need any significant length.

Lots of hits on google/Ebay in several materials.

Neil Wyatt07/02/2019 17:03:32
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Moderator
15700 forum posts
659 photos
73 articles

That's right althouigh slightly undersize won't do any harm.

I doubt you will be able to buy those sizes off the shelf.

Neil

The Novice Engineer07/02/2019 17:11:44
47 forum posts
20 photos

Try here for 6BA Studding

https://maccmodels.co.uk/ba-fastners-washers/ba-studding/6-ba-steel-studding.html

or click on the link below

**LINK**


not done it yet07/02/2019 17:28:15
2715 forum posts
11 photos

I expect you can use any size above the minimum, but if long lengths you will need a traveling steady to turn the rod to size. Are you single pointing or running a die down the rod? As above, buying threaded rod may be easier, but obviously several choices. But threaded rod is expensive if you only need the threads on each end.

JasonB07/02/2019 17:38:24
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Moderator
15027 forum posts
1532 photos

EKP sell 7/64" which will take 6BA quite nicely.

Alternatively can you substitute 3.0mm rod and thread M3

3404607/02/2019 18:03:56
350 forum posts
2 photos

Thanks for replies to all.

I am always impressed by the quick helpful replies you get on the forum.

The links to the suppliers was most welcome

Bill

Ian Skeldon 207/02/2019 19:25:43
341 forum posts
27 photos

Firstly my apologies is this post is considered to be hi-jacking the original thread (there's a pun in there somewhere).

What is considered to be the best way to create very small diameter threads ( 1mm for instance) both internal and external, can you buy taps and dies in that sort of size?

Thanks,

Ian

Benjamin Day07/02/2019 19:34:50
44 forum posts
Ian, search watchmaker die plate. Several size dies are all on one plate, they usually come with the silly tiny taps too. Hope this helps!
IanT07/02/2019 20:08:56
1250 forum posts
128 photos

Hi Ian S2

Surprisingly (at least I was surprised) Machine Mart sell a set of taps and dies that range from 1mm to 2.5mm. I've only used mine on brass (and will not use them on ferrous at all) but they seem OK. Usual cautions - you need to guide the tool - both the taps and dies in these sizes - especially the small ones. I've just checked and they are currently £38.39 a set

Probably not top quality at that price but for occasional (and careful) use they were the best option for my needs.

Regards,

IanT

Nick Clarke 307/02/2019 20:22:08
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198 forum posts
3 photos

Posted by Ian Skeldon 2 on 07/02/2019 19:25:43:

Firstly my apologies is this post is considered to be hi-jacking the original thread (there's a pun in there somewhere).

What is considered to be the best way to create very small diameter threads ( 1mm for instance) both internal and external, can you buy taps and dies in that sort of size?

Thanks,

Ian

I have the set that IanT suggested and second his views.

Have a look at Tracy Tools website, or if you are at Doncaster Show pick up one of their catalogues. - usual disclaimer - just a satisfied customer - other suppliers are available etc etc

Ian Skeldon 208/02/2019 20:45:23
341 forum posts
27 photos

Thank you Benjamin, IanT and Nick, I will check out both of those suggestions.

Ian

Chris Trice09/02/2019 11:20:21
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1351 forum posts
9 photos

https://www.amazon.co.uk/Small-0-70mm-Plate-Match-Postage/dp/B00BJ2RFYW

Chris Trice09/02/2019 11:22:20
avatar
1351 forum posts
9 photos

https://www.amazon.co.uk/Rolson-59154-HSS-Mini-Tap/dp/B0080R1M6G

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