The following warnings occurred:
Warning [2] Undefined variable $search_thread - Line: 60 - File: showthread.php(1617) : eval()'d code PHP 8.1.31 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/showthread.php(1617) : eval()'d code 60 errorHandler->error_callback
/showthread.php 1617 eval



Austinsevenfriends › Austin Seven Friends Forum › Forum chat... v
Wing Screw Thread ?

Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Threaded Mode
Wing Screw Thread ?
John P Offline
Member
***
Joined: Apr 2018 Posts: 191 Threads: 76
Reputation: 0
#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.
Reply
Tony Griffiths Offline
First Grey Mag editor
*****
Joined: May 2018 Posts: 2,954 Threads: 558
Reputation: 20
Location: Peak District, Derbyshire
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
Reply
John P Offline
Member
***
Joined: Apr 2018 Posts: 191 Threads: 76
Reputation: 0
#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.
Reply
Ruairidh Dunford Offline
Bearded Wizard
*******
Joined: Mar 2015 Posts: 5,442 Threads: 231
Reputation: 67
Location: Scotchland
#4
12-09-2024, 06:40 PM
The thread is normally 5/16 BSW.
https://gordonenglandregister.wordpress.com/
Reply
Tony Griffiths Offline
First Grey Mag editor
*****
Joined: May 2018 Posts: 2,954 Threads: 558
Reputation: 20
Location: Peak District, Derbyshire
Car type: 1929 Chummy, 1930 Chummy, 1930 Ulster Replica, 1934 Ruby
#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
Reply
Robert Leigh Offline
Posting Freak
*****
Joined: Aug 2017 Posts: 926 Threads: 22
Reputation: 10
Location: Near Cambridge, UK
Car type: 1928 tourer (mag type), short chassis Gould Ulster
#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.
Reply


Forum Jump:


Users browsing this thread: 1 Guest(s)