Source of small metric steel screws – non stainless

This topic has 9 replies, 7 voices, and was last updated 7 February 2023 at 23:09 by Michael Gilligan.

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6 February 2023 at 18:27 #632301
Steve Crow
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@stevecrow46066
The 12BA cheesehead steel screws I've used from Macc Models seem really well made. A light dressing and polishing on the lathe, a slight chamfer on the slot with a stone and they blue up beautifully. British made too, I believe.

Does anyone know of an equivalent in M1.6 and M2.0? I can only find stainless and quite crude ones at that.

I can make my own but the Macc Models ones are so good and I need about 60 or 70 of them.

Also, if anyone has any 10BA cheeseheads, could they measure the head diameter for me as I've been unable to find out?

Cheers

Steve

Edited By Steve Crow on 06/02/2023 18:28:12
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6 February 2023 at 18:27 #29030
Steve Crow
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@stevecrow46066
6 February 2023 at 19:39 #632324
Clock polisher
Participant
@clockpolisher
Good evening Steve,

I have, in the past, bought all my small nuts, bolts and screws from modelfixings.co.uk

The usual disclaimer, I have no connection with them, I am just a satisfied customer.

regards,

David

Edited By Clock polisher on 06/02/2023 19:41:21
6 February 2023 at 19:50 #632327
JasonB
Moderator
@jasonb
I've not used their cheese heads but the hex heads from GHW are well made and fully machined not chesap pressings, the "cylinder" head ones they show also look to be machined. They usually arrive in 3-4 days via DHL and price at checkout includes taxes
6 February 2023 at 19:51 #632329
Dave Smith 14
Participant
@davesmith14
One of the best sources of small metric fasteners, not cheap though.

GWH

I think Jason uses them as well.

Dave
6 February 2023 at 21:15 #632338
bernard towers
Participant
@bernardtowers37738
Head size should be between 0.090 and0.095ins. So 3/32 stock should do it.

Edited By bernard towers on 06/02/2023 21:16:00
6 February 2023 at 23:22 #632351
IanT
Participant
@iant
I've just mic'ed a couple of my 10BA (brass) C/H 10BA screws Steve and they are 0.108" – 0.109". Had them a while so fairly old stock. I haven't checked my books to see what they should be. Probably in Machinery somewhere…don't think it's crucial

Anyway, that's about 2.75mm – so 3mm stock should turn down quite nicely.

Regards,

IanT
7 February 2023 at 20:46 #632500
IanT
Participant
@iant
As I needed to look something else up this evening, I also had a look in both my 'Machinery's' for this info but they only gave the usual tpi/tapping stuff available in Tubal Cain etc. However, on the off chance I also checked 'Machinery's Screw Thread Book' (12th Edition 1941) and there it was under 'Heads and Nuts for British Association Screws'.

So apparently 10BA heads should be 117 mils (a mil is 0.001" – not a mm) for C/H screws and the same A/F for Hex heads. Nuts should be 67 mils thick, so I assume the heads would be similar. All mine are smaller though.

Knew I'd need that book one day!

Regards,

IanT
7 February 2023 at 22:46 #632520
IanT
Participant
@iant
Further to my last post…

'Newnes Engineers Refernce Book' (7th Edition 1956) perhaps unsuprisingly agrees with 'Machinery' but adds an interesting extra fact – the 'W' (Width) for both C/H and Hex heads is arrived at by multiplying the shank/full thread diameter (D) by 1.75 and this seems to apply to all BA sizes listed (0-12BA).

The Depth of Head is derived by multiplying 'D' by 0.75 (at least for C/H, Hex & Connection screws – it varies for other types). So for 10BA heads this should be 50 thou deep. The 10BA nut depth is correct at 67 thou.

So the simple rule for BA is (or at least was) Head Width = 1.75D and the Head Depth = 0.75D

(which is fairly easy to remember)

Regards,

IanT
7 February 2023 at 23:09 #632522
Michael Gilligan
Participant
@michaelgilligan61133
Well-found, Ian

Useful sort of information to have.

MichaelG.
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