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Thread: BSA Cadet Front Stock Screws being manufactured for me

  1. #31
    Join Date
    Feb 2011
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    bedlington NE22 7JL
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    1,542
    well ive got a part restored belter sitting behind me.ive the screw in my hand but my thread gauge is in the ''shed of plenty''...ill update the ''thread'' with the tpi when i open up...

  2. #32
    Join Date
    Feb 2001
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    Winchester, UK
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    15,344
    Found my pitch guage, and it is 28TPI which makes it UNF I believe.

  3. #33
    Join Date
    May 2008
    Location
    Wingham, 5 miles NW of Baz
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    It is 100% 28 TPI as the Cadet Major screw fits the 7/32" 28TPI Die perfectly except it's wobby loose inside even though it fits to the pitch very well. I therefore think that the screws are 13/64" 28TPI and NOT 7/32" 28TPI

    For this reason I am hoping that a heavily squeezed down die will effectively make a thread of 13/64 28TPI and all will be well.

    I'll let you know what happens...

    Opportunity is missed by most people, because it is dressed in overalls and looks like work.

  4. #34
    Join Date
    Jan 2008
    Location
    Inverness
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    80
    Just to throw petrol onto the fire, what about the thread form? That may also make a difference.

  5. #35
    Join Date
    May 2008
    Location
    Wingham, 5 miles NW of Baz
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    Quote Originally Posted by Heavy Roller View Post
    Just to throw petrol onto the fire, what about the thread form? That may also make a difference.
    Nothing that a heavy-handed screwdriver won't fix
    Opportunity is missed by most people, because it is dressed in overalls and looks like work.

  6. #36
    Join Date
    Feb 2001
    Location
    Winchester, UK
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    15,344
    I've just rechecked the thread diameter, and over a thread length of 11/32" and 28TPI, the leading thread diameter is 3/16" and the trailing thread is 13/64", so there appears to be a very slight taper.
    These measurements were taken from a virtually brand new screw with an overall length of 1.3/64", with a pan head diameter of 11/32" and a depth of 5/32", followed by a waist of 5/32" diameter for 17/32", and a thread length of 11/32".
    Hope this is of some help.

  7. #37
    Join Date
    May 2008
    Location
    Wingham, 5 miles NW of Baz
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    Quote Originally Posted by Troubledshooter View Post
    I've just rechecked the thread diameter, and over a thread length of 11/32" and 28TPI, the leading thread diameter is 3/16" and the trailing thread is 13/64", so there appears to be a very slight taper.
    These measurements were taken from a virtually brand new screw with an overall length of 1.3/64", with a pan head diameter of 11/32" and a depth of 5/32", followed by a waist of 5/32" diameter for 17/32", and a thread length of 11/32".
    Hope this is of some help.
    WOW - thanks mate

    Sounds easy to make!

    Matty
    Opportunity is missed by most people, because it is dressed in overalls and looks like work.

  8. #38
    Join Date
    Feb 2011
    Location
    Derby
    Posts
    329
    Quote Originally Posted by Troubledshooter View Post
    I've just rechecked the thread diameter, and over a thread length of 11/32" and 28TPI, the leading thread diameter is 3/16" and the trailing thread is 13/64", so there appears to be a very slight taper.
    These measurements were taken from a virtually brand new screw with an overall length of 1.3/64", with a pan head diameter of 11/32" and a depth of 5/32", followed by a waist of 5/32" diameter for 17/32", and a thread length of 11/32".
    Hope this is of some help.
    I have found some Cadets have the waisted screws, and some don't.
    But I don't know whether one or both types are original????

  9. #39
    Join Date
    May 2008
    Location
    Wingham, 5 miles NW of Baz
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    Quote Originally Posted by Nitro-Express View Post
    I have found some Cadets have the waisted screws, and some don't.
    But I don't know whether one or both types are original????
    This true but the big question is - were the threads actually the same on all screws despite the obvoius visible design changes?

    In my limited experience:

    Early ones - countersunk head and not waisted

    50s - dome head and waisted

    There may be more to it than this
    Opportunity is missed by most people, because it is dressed in overalls and looks like work.

  10. #40
    Join Date
    Mar 2003
    Location
    hull. east yorkshire. england
    Posts
    911

    cadet screws

    any one send me a pic of one i think ive got a full set.coddy.

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