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Old 18th Sep 2012, 10:41 pm   #21
Andy - G8MNM
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Default Re: Grub screws

I bought 4BA grub screws off Ebay for my 1930s EKCO.

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Old 19th Sep 2012, 12:48 pm   #22
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Default Re: Grub screws

A bit of cut and pastery rather suggests M3 as the most likely candidate!
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Old 19th Sep 2012, 6:51 pm   #23
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Default Re: Grub screws

Quote:
Originally Posted by Herald1360 View Post
A bit of cut and pastery rather suggests M3 as the most likely candidate!
Thanks Chris, call me a old cynic but would a 50y/o piece of British kit be using metric screws
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Old 19th Sep 2012, 7:36 pm   #24
Mike Phelan
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Default Re: Grub screws

No. There are plenty of BA screws still available.
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Old 19th Sep 2012, 8:39 pm   #25
Station X
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Default Re: Grub screws

Yes, but those screws don't look like 4BA or 5BA. I wonder if the holes have been retapped or metric screws forced in? They appear to be screwed directly into the plastic with no steel of brass insert.
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Old 19th Sep 2012, 8:48 pm   #26
vosperd
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Default Re: Grub screws

Sounds like 6BA to me.
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Old 19th Sep 2012, 9:19 pm   #27
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Default Re: Grub screws

Seems possible.

6BA 2.8mm diameter 47.9 TPI.
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Old 20th Sep 2012, 12:14 am   #28
Herald1360
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Default Re: Grub screws

Could well be, looking at the pics again. The diameter one is a bit vague, there could well be 0.2mm of "shadow" in there. 47.9 vs 50.8 TPI isn't very obvious over 5mm either.
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Old 20th Sep 2012, 12:48 pm   #29
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Default Re: Grub screws

Thanks to Alan (Stepney) who has very kindly sent me some screws, of which one fits, I'm sorta sorted.
I'll try and saw a slot in one of the screws I have that fit the thread for the other knobs.

Many thanks to all
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Old 20th Sep 2012, 3:25 pm   #30
Alan Stepney
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Default Re: Grub screws

I was unsure of the size & thread so put a small assortment in an envelope, on the basis that at least one should fit!
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Old 20th Sep 2012, 5:18 pm   #31
kalee20
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Default Re: Grub screws

Were they labelled in any way? I'm interested to know what thread it eventually turned out to be!
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Old 20th Sep 2012, 9:09 pm   #32
Alan Stepney
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Default Re: Grub screws

No. I have a tin full of assorted grub screws, all the odd ones I have collected over the years and this was a small (and somewhat rusty) assortment from them.

I also have some boxed and labelled (metric and BA) but as I was unsure of the thread, this seemed an easy solution.
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