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Thread: Tx200 mk2 spring specs

  1. #1
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    Tx200 mk2 spring specs

    Hi, does anyone know the correct dimensions for a tx200 mk2 spring, standard and custom would be helpful.

  2. #2
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    This may help :-

    http://www.airgunbbs.com/showthread....ng-data-thread

    If not, Jim may have published the spring specs in AirgunWorld when he fitted a Mk2 TX Spring in an LGV.

  3. #3
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    Quote Originally Posted by T 20 View Post
    If not, Jim may have published the spring specs in AirgunWorld when he fitted a Mk2 TX Spring in an LGV.
    That was a Mk.3 spring, Mick.

  4. #4
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    I just happened to measure a standard one yesterday.

    Active coils = 23
    Active Length = 200mm (this doesn't include the collapsed coils at one end)
    Coil OD = 20.7mm
    Coil outer dia = 3.24mm
    Coil inner dia = 14.22
    Mean dia = 17.46mm

    In my TX, 84mm stroke, 11 ft-lb in 0.177, gives 37% efficiency. Very good springs.

  5. #5
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    Quote Originally Posted by BTDT View Post
    That was a Mk.3 spring, Mick.
    Quote Originally Posted by cooper_dan View Post
    I just happened to measure a standard one yesterday.

    Active coils = 23
    Active Length = 200mm (this doesn't include the collapsed coils at one end)
    Coil OD = 20.7mm
    Coil outer dia = 3.24mm
    Coil inner dia = 14.22
    Mean dia = 17.46mm

    In my TX, 84mm stroke, 11 ft-lb in 0.177, gives 37% efficiency. Very good springs.
    Any chance you could post this information on the Mainspring Data Thread please, gents?
    THE BOINGER BASH AT QUIGLEY HOLLOW. MAKING GREAT MEMORIES SINCE 15th JUNE, 2013.
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  6. #6
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    Quote Originally Posted by BTDT View Post
    That was a Mk.3 spring, Mick.
    image.jpeg

  7. #7
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    Thanks for the replies, been trying a v Mach mk2 spec spring in my hc .177 but seems to be oversprung, most power I can get is 10.6 ft lbs.

  8. #8
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    Quote Originally Posted by cooper_dan View Post
    I just happened to measure a standard one yesterday.

    Active coils = 23
    Active Length = 200mm (this doesn't include the collapsed coils at one end)
    Coil OD = 20.7mm
    Coil outer dia = 3.24mm
    Coil inner dia = 14.22
    Mean dia = 17.46mm

    In my TX, 84mm stroke, 11 ft-lb in 0.177, gives 37% efficiency. Very good springs.
    So as to avoid any confusion, can you confirm that the above spring measurements are for the Tx MK2? I will then add them to the database.

    The current database entry reads:
    Air Arms TX200 Mk1/2 21 (20.75)od 3.25 wire diam 207 / 220 length 23 active coils Source from Forum so very close to your posting.

    Cheers, Phil

    PS what is mean diameter? I can see it is id plus wire but I have not seen it quoted before.

  9. #9
    Murphy is offline Cooee! Chase me you naughty boys!
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    IIRC the standard mk2 spring is the FAC mk3 spring.
    Master Debater

  10. #10
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    Thumbs up

    Quote Originally Posted by Murphy View Post
    IIRC the standard mk2 spring is the FAC mk3 spring.
    maybe without the collapsed coils
    them there springer's are soooooo addictive

  11. #11
    Murphy is offline Cooee! Chase me you naughty boys!
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    Quote Originally Posted by joffy View Post
    maybe without the collapsed coils
    From memory they have the same part number.
    Master Debater

  12. #12
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    Quote Originally Posted by T 20 View Post
    https://imgflip.com/i/1ltuwg

  13. #13
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    Quote Originally Posted by Phil Russell View Post
    So as to avoid any confusion, can you confirm that the above spring measurements are for the Tx MK2? I will then add them to the database.

    The current database entry reads:
    Air Arms TX200 Mk1/2 21 (20.75)od 3.25 wire diam 207 / 220 length 23 active coils Source from Forum so very close to your posting.

    Cheers, Phil

    PS what is mean diameter? I can see it is id plus wire but I have not seen it quoted before.
    Yes that was for an OEM Air Arms mk2 TX200 spring with the collapsed coils. Purchased some time last year.
    The length I measured was 'active length' so it doesn't include the collapsed coils at the end. They would add about 10mm I guess to the total length. Next time it's apart I can check.

    Mean diameter is the diameter at the axis of the wire if that makes sense. i.e half way between outer dia and inner dia. That's the number needed to calculate the spring constant (k).

    I have a spreadsheet that calculates efficiency of my competition TX200. I know it should be between about 36-40% when it's all working well. If it drops much below that I know there is something wrong. So I know to check the seals and spring etc. Sometimes this gun gets stripped and rebuilt twice a week (if it's a wet weekend with 2 shoots on) so it's worth doing. However the TX is mega and has only come up short twice in about 18 months.


    Make Air Arms
    Model TX200
    Date 22/4/19
    Active coils 23
    Length 200
    Coil OD mm 20.7
    Coil dia mm 3.24
    Mean dia mm 17.46
    Coil ID 14.22
    Stroke 83
    Preload 12
    k 8.923

    Pellet speed fps 770
    Weight grain 8.44
    Power ft-lb 11.11
    Joules 15.07

    Spring Rate fitted N 107
    Spring rate cocked N 848
    Average rate N 477
    Recoverable energy Joules 40

    Efficiency % 38.0

  14. #14
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    Some excellent, in-depth information there, Dan.
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  15. #15
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    Quote Originally Posted by joffy View Post
    maybe without the collapsed coils
    I have used the MarkI piston in my FAC MarkIII. In normal tune it shot 8.44 Exacts at 900 fps and with just the change to the MarkI piston, it dropped to 790 fps. It would seem the FAC MarkIII spring is very close to the same performance as the original MarkI/MarkII spring.

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