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Small Exterior Door Handle Screws.
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Farmer John



Joined: 18 Feb 2010
Posts: 178
Location: Manawatu NZ

PostPosted: Wed May 20, 2020 5:46 am    Post subject: Small Exterior Door Handle Screws. Reply with quote

Hi everybody. I am wanting to fit the drivers door handle on my 1953 Lanchester but am getting dragged into an area where I know nothing, namely threads on tiny screws. I found two screws in my collection of tiny things and each has the diameter and pitch needed however the screw heads and lengths are wrong. I would have a go at shortening but the heads are no good to me.
If somebody could point me at the right diameter thread name and pitch I would be most grateful.
First screw, I measured the thread diameter at 0.108". Two attempts at counting the threads, 20 threads over the 7/16" screw length, and 11 threads over 1/4 of an inch.
Second screw, I measured the thread diameter at 0.177 or 0.18. Several attempts at counting these threads gave me 31 threads over an inch.
I am hoping someone can take into account the make and age of the vehicle and my fifty year old micrometer and vernier caliper and come up with some likely screw specs.
I do not know where I might buy these things here that is a major challenge to come.
Thanks in anticipation
John
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V8 Nutter



Joined: 27 Aug 2012
Posts: 550

PostPosted: Wed May 20, 2020 8:42 am    Post subject: Reply with quote

It looks as though the small one could be 6 B.A. and the big one 2 B.A. Search B.A. thread charts, you will find loads of info. B.A. was the common small thread system.
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ukdave2002



Joined: 23 Nov 2007
Posts: 3610
Location: South Cheshire

PostPosted: Wed May 20, 2020 8:52 am    Post subject: Reply with quote

Hi John

Agree; It looks very much like a 6BA thread; 0.11" diameter 0.0209" pitch (about 48 tpi), and a 2BA 0.1850" 31.4 tpi.

BA threads are common on handles of this era.

Dave
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Farmer John



Joined: 18 Feb 2010
Posts: 178
Location: Manawatu NZ

PostPosted: Wed May 20, 2020 9:03 pm    Post subject: BA screws Reply with quote

Thankyou gentlemen, that is precisely the information I need. I can now shop with confidence knowing exactly what I want.
John
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Kenham



Joined: 12 Mar 2012
Posts: 195
Location: Kent

PostPosted: Wed May 20, 2020 9:45 pm    Post subject: Reply with quote

Buy yourself a Zeus book, only a few pounds it will give you all the info you need.
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Miken



Joined: 24 Dec 2012
Posts: 348

PostPosted: Wed May 20, 2020 10:37 pm    Post subject: Reply with quote

If you can't find what you want, Could you open the threads up with an M3 tap?
Metric screws are cheap and readily available. I won't tell anyone.
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Penman



Joined: 23 Nov 2007
Posts: 4277
Location: Lancashire

PostPosted: Wed May 20, 2020 11:08 pm    Post subject: Reply with quote

Hi
You haven't mentioned the head style. If I remember correctly visible screw heads which I believe these to be, were usually countersunk but with a slightly domed top, and of course they would have slots not any of the other more modern aperture such as Phillips or Star etc.
_________________
Bristols should always come in pairs.

Any 2 from:-
Straight 6
V8 V10
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Peter_L



Joined: 10 Apr 2008
Posts: 2530
Location: New Brunswick. Canada.

PostPosted: Wed May 20, 2020 11:18 pm    Post subject: Reply with quote

Miken wrote:
If you can't find what you want, Could you open the threads up with an M3 tap?
Metric screws are cheap and readily available. I won't tell anyone.


I won't tell either... for a price $ Smile
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MVPeters



Joined: 28 Aug 2008
Posts: 747
Location: Northern MA, USA

PostPosted: Thu May 21, 2020 3:14 am    Post subject: Reply with quote

John
Try your local model railway shop - they should have plenty.
_________________
Mike - MVPeters at comcast.net
2002 Mini Cooper 'S'
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