Threading a bar for 6ba

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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

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.

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

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**

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.

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

Alternatively can you substitute 3.0mm rod and thread M3

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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

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

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

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

Ian

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

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