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Bsa Cadet Major Piston Thread

Discussion in 'Vintage collectable airguns' started by K1eren tabor, May 24, 2020.

  1. K1eren tabor

    K1eren tabor Member

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    Good morning all. I am after a bit of knowledge from the forum. I have been gifted a CC Cadet Major, the trigger had snapped and gun has been unused for 20 years (stored in a garage in a leather sheath). I have stripped it down and the piston seal retaining nut has sheared on one side. On removal the thread is also damaged on the stud as to be expected. My query is, what is the thread size as I intend to go over it before I reassemble.

    Apologies if this has been covered but I cant find it anywhere
     
  2. ggggr

    ggggr Crap old gun tinkerer and wine maker

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    From memory ( I think there are 2 sorts of pison washer and fixing. Also that the piston rod is screwed into the piston OUCH! http://www.airgunspares.com/store/product/7282/BSA-Cadet-Major-Piston-Rod-Part-No.-16-463/
    On a Cadet I had I tapped the end of the piston 2BA I think (As if you go bigger you will take out the threads on the rod) and made a leather washer up.
     
  3. DClaw

    DClaw Engaging Member

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    Got a feeling that the spigot/stud is a BSF thread, possibly 3/8 x 20 ???...
     
  4. flatrajectory

    flatrajectory Keyboard Hero

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    I t may be whitworth, but BSA also made there own thread forms to suit their needs. I would chop it. drill it, re-tap it for metric.
     
    Papa g likes this.
  5. ggggr

    ggggr Crap old gun tinkerer and wine maker

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    I'm pretty sure it is 5/16 Bsf Dave, thinking about it Dave, which would be 22 Threads per inch.
    As I've said --the rod goes through and is screwed into the piston so if you tap for a screw you cannot go very big or there will be no thread to hold it in the piston.
     
    DClaw likes this.
  6. DClaw

    DClaw Engaging Member

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    Hi Guy,

    I've made a few piston heads for Cadet/Majors and still I'm buggered if I can remember so will bow to your greater knowledge mate :)

    Edit: yep...22 tpi would be 5/16" if it is a BSF thread.
     
    K1eren tabor likes this.
  7. K1eren tabor

    K1eren tabor Member

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    It was indeed a 5/16" bsf thread. All tidied up now and good as new. Ordered a piston washer from Knibbs, looks very different to my original! Mine resembles a BSA light Std. Piston Washer Outer Part No. STD15 with a different center/washer nut, which is now in 2 pieces. Anyone have images of the Cadet Major original seal arrangement?
     
    DClaw likes this.
  8. ggggr

    ggggr Crap old gun tinkerer and wine maker

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    I think this is the one you should be getting? http://www.airgunspares.com/store/product/5374/BSA-Cadet-&-Major-Washer-Assy-Part-No.-16-808/ ----------but if you have managed to clean up the rod and nut then just the outer washer should be ok.
     
  9. norman

    norman Donator

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    Welcome to the friendly forum...over 70 odd years piston washers were sometimes "rescued" from other source's other than gun shops or spares companies..anything that did the job could/would be used...leather once fashioned & bedded in imho is the best...pump washers were often fitted...:up:
     
  10. K1eren tabor

    K1eren tabor Member

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  11. DClaw

    DClaw Engaging Member

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    That is the same type of Cadet piston head I had and copied, there is a slight chamfer to the outer edge and a shoulder on the back??? ..remember making them in nylon, brass and steel to accept a leather washer, and gave them away to someone...can't remember who though.

    Glad you got it sorted anyways. :)
     
    norman likes this.
  12. K1eren tabor

    K1eren tabor Member

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    So were there multiple options for the original piston seal?

    If the Knibbs part wasn't correct it was my intention to machine a new steel washer/nut and use a BSA light standard leather washer as a replacement
     
  13. DClaw

    DClaw Engaging Member

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    Yes, I guess there must have been at least 2 different types of piston head as supplied from the factory (J knibbs part is correct, just a different and more common type/design)
     
    K1eren tabor likes this.

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