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  1. #1
    Join Date
    Feb 2013
    Location
    Laidley, SE Qld
    Posts
    771

    Default Drilling tap a Sportco 33 .222

    I've been asked to drill and tap 2 x M4 through holes on this rifle, about where the small screw and nut are in the crappy photo. I don't want to start unless I know I can do it with a standard HSS drill and tap.
    How hard or tough is the steel?
    Thanks in advance.


  2. #2
    Join Date
    Dec 2005
    Location
    South Australia
    Posts
    699

    Default

    HSS should be fine, I have lost count how many I have drilled over the years all with HSS

  3. #3
    Join Date
    Jan 2004
    Location
    Mackay North Qld
    Posts
    4,542

    Default

    I have a friend who does gunsmith work and he uses spiral taps exclusively on tapped holes for receiver mounted scopes and the like.

    I tried spiral taps and they reduce the tapping effort effort by a big factor.They were dearer but not by a lot.

    Less likely to snap and reduce the chance of an unsuccessful job.

    Grahame

  4. #4
    Join Date
    Feb 2013
    Location
    Laidley, SE Qld
    Posts
    771

    Default

    Job's done without any worries, thanks for the advice, the steel was probably as tough as 1045.

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