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Posi screws in your Square

Discussion in 'Tech Discussion' started by WesN, May 28, 2020.

  1. WesN

    WesN Full Access Member

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    You might find a lot of philips screws in your GM truck have been rounded out or your screw driver slips while you are removing or tightening them. That is because they are not Philips they are Posidrive. It is easy to spot because of the little dots between the x on the screw (see photo) if you look at the two screw driver blades you will see at the part that enters the screw the Posi is rounded and the Philips is straight edged. The Posi drive will actually hold a Posi screw horizontal without being magnetic. Believe it or not I have taught a number of Snap-on and Mac dealers about this because they weren’t aware of it. DC5C4B4D-B83D-4F2A-AE47-22CDF3D9FC05.jpeg A1EEB789-6A8E-434C-86BB-3BA318BF540E.jpeg 3AA6AE51-B1E3-4D07-AFB3-C6E1F6886351.jpeg D0EF8FF3-5D5A-4DE7-B3F7-62BD6328CB8A.jpeg
     
  2. DoubleDingo

    DoubleDingo Summer Is Near, Hot Temps Are Already Here

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    I've seen drivers with that tip but never knew it was special, thought it was just different. I learned something today, now I can go home.
     
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  3. MikeB

    MikeB Full Access Member

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    Back in the day, Hewlett Packard and others used Pozidriv screws on electronic test equipment that I worked with. Using them and the proper screwdriver makes you wonder why they aren't more popular. Pozidriv is to Phillips, as Phillips is to straight slot.
     
    Last edited: May 28, 2020
  4. Termite_Delight

    Termite_Delight Full Access Member

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    I too learned something today... never knew that.

    I still say Robertson screws are better. ;)
     
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  5. Salty Crusty

    Salty Crusty Full Access Member

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    One is true phillips, the other was first called Reed and Prince (I think it's your posi drive). The depth of the pointed tip was considered wasted since it provided no meaningful surface area on which to imart force.
     
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  6. eskimomann209

    eskimomann209 Supporting Member Supporting Member

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    I used a lot of Robertson screws doing hardi backer cement board and other sub flooring stuff. I thought I loved those, then everyone went t25 Torx. I’ll admit for construction screws they’re the shit. I adore them, they also put a little flute on the tip of the screws to help cut better. Makes subfloor repair in older homes way easier.
     
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  7. DoubleDingo

    DoubleDingo Summer Is Near, Hot Temps Are Already Here

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    Oh yeah those torx screws are the bees-knees
     
  8. Goldie Driver

    Goldie Driver Full Access Member

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    Cool to know, but now I guess I need more tools.

    Ever heard anything about Japanese Phillips?

    I wonder if they are really some sort of a Posi style.
     
  9. Turbo4whl

    Turbo4whl Full Access Member

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    The Amish builders in this area have been using Robertson screws for years. Electric power tools are not recommended in their lifestyle, air tools, fully acceptable.

    Yeah, Pozidriv, mine says USA :patriot:

    thumbnail2.jpg
     
  10. AuroraGirl

    AuroraGirl Supporting Member Supporting Member

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    square screws... about 3 of my tail light screws were square, 4 were torx, 3 were standard, 2 were hex, and the rest were phillips!

    I went and bought new U clips, used #8 1 inch phillips screws with anti sneeze.
    Why, grandpa.
     
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  11. Kevin McDermand

    Kevin McDermand Member

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    Anti sneeze? just kidding
     
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  12. AuroraGirl

    AuroraGirl Supporting Member Supporting Member

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    Yes, I use anti sneeze on my carbitrator bolts. Never heard it called that before?
     
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  13. MikeB

    MikeB Full Access Member

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    Reed and Prince screwdrivers have a point. Can't think of anything the screws were good for.

    [​IMG]
     
  14. DoubleDingo

    DoubleDingo Summer Is Near, Hot Temps Are Already Here

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    Getting stripped out by guys like me that didn't know these types of screws existed?
     
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  15. WFO

    WFO Full Access Member

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    There's also JIS (Japanese Industrial Standard) screws.
     
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