BSA Thread form & Sizes

[JasonBModerator @jasonb]

Can anyone find a chart showing sizes of BSA threads and their form & tpi. I’m looking at an old 1919 Stevens Model Dockyard catalogue and they have small fixings, Thread plates and taps in that form which are numbered much like BA.

Google just wants to give me stuff about BSA bikes

[bernard towersParticipant @bernardtowers37738]

From what I can glean off Internet is that BSA is BSCY which I have a chart ranging from 0.056 x 62tpi to 1.625 x 24tpi if thats any help. I can scan it as I dont remember the source but it was an internet search that threw it up.

[bernard towersParticipant @bernardtowers37738]

Google NWMS for chart.

[Chris GunnParticipant @chrisgunn36534]

NWMES is better,

[BazParticipant @baz89810]

Just tried googling NWMS and get drain cleaning companies, a north west medical solutions company and someone offering ISO solutions, can you please be a bit more precise please Bernard.

[bernard towersParticipant @bernardtowers37738]

Try BSCY thread data and the second one down is NWMES. Sorry

[Speedy Builder5Participant @speedybuilder5]

from the net,  BSC adopted the BSA standard;-

https://britishfasteners.com/threads-bsc

Bob

[noel shelleyParticipant @noelshelley55608]

There in The metalworkers Data Book No 42 workshop series.  Page 50. Noel.

[bernard towersParticipant @bernardtowers37738]

Bob ,I dont think that chart goes small enough for what Jason is looking for.

[Gerard O’TooleParticipant @gerardotoole60348]

This chart might be better, from same website

https://britishfasteners.com/threads-cei

[Andrew CrowParticipant @andrewcrow91475]

I don’t know how to copy the link on my phone, but look on http://www.nwmes.org.uk this gives a full chart of bsc threads including numbered sizes.

Andy

[Andrew CrowParticipant @andrewcrow91475]

I know now! It is a download file by the way.

Andy

[Andrew CrowParticipant @andrewcrow91475]

Having looked again at the chart the number sizes are all swg which I presume were for making spokes.

Andy

[JasonBModerator @jasonb]

Thanks All, looks like it is the small BSC form. I was looking for  a40tpi thread of about 0.140″ dia and the 9g one looks about right.

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