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  1. #1
    Elite Member Cliff_Johns's Avatar
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    Default Drilling out SS rivits and what does HSO mean on a drill bit?

    I'm trying to drill out some stainless steel rivits. I'm going through
    my pile of old drill bits acquired from various places and found some
    that are marked HSO instead of HSS. The markings are quite clear.

    So 2 questions:
    First, what does HSO mean on a drill bit?
    Second, To drill out the rivits, I figure use slow speed and a little
    wd-40 -- this has to be hand drilled. Any other advice?

    Cliff

  2. #2
    Super Member Scooby074's Avatar
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    Default Re: Drilling out SS rivits and what does HSO mean on a drill bit?

    Is HSO the brand?

    And if the rivets are anything besides pop rivets, I'd probably use a cobalt bit anyways.

  3. #3
    Elite Member
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    Default Re: Drilling out SS rivits and what does HSO mean on a drill bit?

    HLH and HSO example:

    HLH HSO 7/16" Drill Bit 5 5/8" Reduced 3/8" Straight Shank | eBay

    I don't know what either means.

    Bruce

  4. #4
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    Default

    Quote Originally Posted by bcp
    HLH and HSO example:

    HLH HSO 7/16" Drill Bit 5 5/8" Reduced 3/8" Straight Shank | eBay

    I don't know what either means.

    Bruce
    I don't have a link, but there is a website (acronymfinder.com?) that has a lot of odd thing listed.
    Dan H.

  5. #5
    Elite Member Cliff_Johns's Avatar
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    Default Re: Drilling out SS rivits and what does HSO mean on a drill bit?

    They are pop rivits.

    Quote Originally Posted by Scooby074 View Post
    Is HSO the brand?

    And if the rivets are anything besides pop rivets, I'd probably use a cobalt bit anyways.

  6. #6
    Platinum Member BIG DOOLEY's Avatar
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    JOHN DEERE 2320

    Default Re: Drilling out SS rivits and what does HSO mean on a drill bit?

    Is there a size on the bit?
    could the O be a letter "O" which is 0.316"
    HSO = High Speed letter O
    i have seen many bits marked HS and then the size
    or
    maybe it is for Oxide
    black oxide bit ?
    have never read or heard of an HSO category drill bit.
    tom

  7. #7
    Platinum Member BIG DOOLEY's Avatar
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    JOHN DEERE 2320

    Default Re: Drilling out SS rivits and what does HSO mean on a drill bit?

    About removing the rivets.
    if you are not worried about a painted surface or emery wheel marks. i remove alot of s.s. rivets at work by using an angle grinder with a 60 or 80 grit flap disc.
    grind the rivet front or back flush to the sheet metal and use a drift punch or a center punch to remove the other half.
    drilling many times will spin the rivet if you use too much pressure and will usually mark up the mounting surface too.
    tom

  8. #8
    Elite Member Cliff_Johns's Avatar
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    Default Re: Drilling out SS rivits and what does HSO mean on a drill bit?

    Specifically, it says HSO then on the next line it says 3/16

    Quote Originally Posted by BIG DOOLEY View Post
    Is there a size on the bit?
    could the O be a letter "O" which is 0.316"
    HSO = High Speed letter O
    i have seen many bits marked HS and then the size
    or
    maybe it is for Oxide
    black oxide bit ?
    have never read or heard of an HSO category drill bit.
    tom

  9. #9
    Elite Member Cliff_Johns's Avatar
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    Default Re: Drilling out SS rivits and what does HSO mean on a drill bit?

    It's on a painted surface that I don't want to dammage, otherwise, I suppose that would work pretty fast.
    Cliff

    Quote Originally Posted by BIG DOOLEY View Post
    About removing the rivets.
    if you are not worried about a painted surface or emery wheel marks. i remove alot of s.s. rivets at work by using an angle grinder with a 60 or 80 grit flap disc.
    snip . . .
    tom

  10. #10
    Super Member texasjohn's Avatar
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    Default Re: Drilling out SS rivits and what does HSO mean on a drill bit?

    how about using a dremel type grinder...or a stone in a drill...just brainstorming...I almost always grind out a rivet than drill it out...
    Joy is having the tools you need and needing the tools you have!

    Kubota 5030 HSTC, BB, Danueser PHD, LA853 QA HD FEL w JD toothbar, 3pt chisel, 3 pt disk, 6' shredder, Kubota FEL hay spike, 3pt hay fork w carryall, Kubota RTV 1140

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