[Healeys] 6-36 windscreen screws

[Curtis Arndt]

Windscreen screws on 100s are no. 4 BA.  The six cylinder screws are NOT
2BA. AH Spares is wrong on this one.

Regarding no. 2 BA and 10-32 being similar they may be about the same size
but they are in NO WAY interchangeable!!!

A 10-32 screw has 32 tpi and has a 60 degree pitch angle of the threads.  A
no. 2 BA has 31.4 tpi and is 47 1/2 degree pitch angle of the threads.

Cheers,

Curt
AH Concours Registry Chairman and fastener expert

On Wed, Feb 10, 2016 at 1:31 PM, Ian Hey <rianhey at btinternet.com> wrote:

> Hello All
>
>
>
> I have a BJ7 and have been told (by AH Spares) that the windscreen screws
> are 2BA.  That is similar to No10 UNF so that is what mine now are.
>
>
>
> No 6-36 sounds as if it is very similar to 4BA which is 0.142 inch
> diameter, 38.5 threads per inch.  BA (British Association) threads are
> widely used for threads less than ¼ inch in all British mechanical and
> electrical equipment up to the 1960s and 1970s.  They have probably died
> out now in new equipment.  The largest is 0BA which has a diameter of 0.236
> inch.
>
>
>
> I suspect that the windscreen screws referred to as No 6-36 are actually
> 4BA
>
>
>
> Regards
>
>
>
> Ian Hey
>
>
>
>
>
>
>
>
>
>
>
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