[Healeys] 6-36 windscreen screws

[i erbs]

Curt, Do you have source for the screws? I think that is where this thread
started...

Ira Erbs
Portland,OR
      _______                                  _______
     (______ \____1959 BN4____/ _______)
         (_________________________)
          BT7 engine and disk brakes

On Wed, Feb 10, 2016 at 1:52 PM, Curtis Arndt <cnaarndt at gmail.com> wrote:

> 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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>
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