Yes, they're 4BA.
3000 Mk I registrar
On 11/12/2010 11:29 PM, Bert Van Brande wrote:
> Looking for the specification of the brass nuts on the signal posts of the
>fuel gauge (where the electric wire attaches) for an original 100-4 gauge. I
>believe they're BA. I measure an OD of 0.137" and since I don't have
>BA/BSF/Whithworth gauges I estimated thread pitch around 38 TPI
> According to Wikipedia this brings it close to a 4BA 0.1417 in / 3.6 mm
>38.46 TPI So I measure 4 thou difference on the diameter. Maybe wear or my
> Can anybody confirm or correct my thinking?
> UK model engineering supplies still carry these nuts, not sure if there are
>sources on this side of the pond but postage on a couple nuts will likely not
>be too high.
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