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Smith and Wesson strain screw....

SwanKong
Can anyone tell me the overall length of the strain screw on a K-frame Smith and Wesson(model 19 to be exact). -Thanks.
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7 comments

Date Votes
  • beantownshootah
    Not off the top of my head, but if you take off the grips on yours, you can see and measure it for yourself.

    Alternatively, for a pretty small amount of money, you can just get one and measure it yourself:

    http://www.midwayusa.com/viewProduct/?productNumber=651695

    Edit, oh yeah, forgot the obligatory picture:
    mainspringstrainscrew004.jpg

    According to the reference linked to the above image, a hardware store purchased socket head #8-32 x .5" SS hardened set screw will work as a substitute, so there are your dimensions.

    http://www.thehighroad.org/showthread.php?t=423269
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  • SwanKong
    I am trying to determine if the one I have has been shortened because this particular revolver is misfiring when fired from double action. The one I have is .586 inches.
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  • lcdrdanr
    The one on my Model 19-4 is 0.597.

    I doubt 11 thousandths in length is gonna make any difference and the difference could easily be on the slot end which would make no difference anyway.

    Dan R
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  • beantownshootah
    Well, I sort of doubt that the screw's length is the problem.

    I can see maybe why someone might want to LENGTHEN one, but not so much on shortening one (since you can just unscrew it).

    If the screw were shortened, you would probably be able to see that on close examination of the ends.

    Perhaps the springs have been replaced/tampered with.

    Anyway, if you really think the screw is the problem, a new one will only cost a few bucks.
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  • Laredo Lefty
    The reason some people shorten strain screws is to lighten the trigger pull while still being able to fully seat the screw. When the screws are backed out they sometimes will work loose over time.
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  • machine gun moran
    The factory strain screw should have a round end ('bullet-nose'). Shortening the screw to achieve a lighter pull, as has been noted, will usually show. People also sometimes shorten the rebound slide spring in order to lighten the pull. These are actually ways to get a hammer to eventually start bouncing off the primer without lighting it, and to achieve an 'iffy' trigger return as well (as both of these mods involve double-action shooting, which is often the self-defense method, you would wonder why people are pursuing their own demise so aggressively).
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  • SP45
    I don't recall the exact length but they are different for round or square butt models. At the armorers school back 25 years ago after assembly you would measure the spring tension in pounds and shorten it if necessary as long as you stay in factory specs. It is very common to see the strain screw shortened to the point of misfires just as it is common to for the rebound screw to be shortened to the point where it doesn't work. After checking the screw check for end shake. If the cylinder is moving forward to far from the firing pin you will have misfires as well.
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