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Wing Screw Thread ?

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Wing Screw Thread ?
John P Offline
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#1
11-09-2024, 05:43 PM
Hi,

Does anyone know what thread is on the wing screws that hold the opening windscreen in place.

I believe they're probably 5/16 but I've no idea if BSW or BSF.

John.
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Tony Griffiths Offline
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Car type: 1929 Chummy, 1930 Chummy, 1930 Ulster Replica, 1934 Ruby
#2
11-09-2024, 10:43 PM
(11-09-2024, 05:43 PM)John P Wrote: Hi,

Does anyone know what thread is on the wing screws that hold the opening windscreen in place.

I believe they're probably 5/16 but I've no idea if BSW or BSF.

John.

BSF is easy to distinguish from BSW, the pitch of BSF is so much finer and easily recognised. These two BSF and BSW charts might help:


Attached Files
.jpg   zz BSF.jpg (Size: 202.64 KB / Downloads: 208)
.jpg   zz BSW.jpg (Size: 194.54 KB / Downloads: 207)
http://lathes.co.uk
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John P Offline
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#3
12-09-2024, 05:48 PM
Sorry, probably didn't explain very clearly.

I haven't actually got the wing screws to measure but as I'm about to make the barrel nuts they screw into I need to know what thread they should be tapped.

John.
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Ruairidh Dunford Offline
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#4
12-09-2024, 06:40 PM
The thread is normally 5/16 BSW.
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Tony Griffiths Offline
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#5
12-09-2024, 06:50 PM (This post was last modified: 12-09-2024, 06:57 PM by Tony Griffiths.)
That's interesting because the replica ones supplied by Willie McKenzie (http://austinrepro.com/general) are BSW - but my '30 Chummy are 5/16 BSF. When the copies arrived, it was obvious that wouldn't fit, yet the barrels into which they screwed appeared to be the same as those from a '29 Chummy (apart from the thread, of course) and not something somebody had made (unless they had taken enormous care). Both threads work with the same efficiency so I suppose either would do if you are going to make your own wing nuts.
http://lathes.co.uk
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Robert Leigh Offline
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#6
12-09-2024, 09:41 PM
There is more tensile strength in a male BSF thread than in a BSW, but the BSW thread itself is stronger and will better resist getting stripped.
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