Pentalobe Screwdriver

Discussion in 'Mac Basics and Help' started by Texas_Toast, Nov 9, 2016.

  1. Texas_Toast macrumors 6502

    Texas_Toast

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    #1
  2. Tomorrow macrumors 604

    Tomorrow

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    #2
    One's pointed, one's rounded. Aside from that, are they really any different?
     
  3. Texas_Toast thread starter macrumors 6502

    Texas_Toast

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    #3
    So can you please help me find me a rounded screwdriver on eBay...

    Everything I see called "pentalobe" looks like a star with pointy edges.

    I assume these will not work.
     
  4. Texas_Toast thread starter macrumors 6502

    Texas_Toast

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    #4
    I was thinking of buying this for my 2015 13" rMBP...

    http://www.ebay.com/itm/181735451839

    But they show a star pattern for the "pentalobe" bits and not the cloud looking ones.

    I am confused...
     
  5. ApfelKuchen, Nov 10, 2016
    Last edited: Nov 10, 2016

    ApfelKuchen macrumors 68020

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    #5
    The "official" pentalobe has curves, not straight lines/points. I'm guessing this has to do with patents - the star-shaped screwdriver has been designed to fit within the dimensions of the pentalobe screw head, without matching the shape.

    Based on long experience with other proprietary screw heads (I have none with Pentalobe), I would not use the star-shaped screwdriver. It will be applying most of the torque at the points of the star, with less force distributed elsewhere (as those straight sides will probably not contact the screw at all). This greatly increases the possibility that the screw head will be damaged.

    The even distribution of force is one of the prime considerations behind fastener head design - the larger the contact surface area, the less force is applied to any part of the relatively soft metal of the screw head. The more precise the fit between tool and fastener, ditto.

    Added: Let me add that I'd be leery of either of the screwdrivers you linked - yeah, the price is low, but note the descriptive text for the cloud-shaped pentalobe -
    They also recommend buying Phillips screws as replacements... not necessarily a bad recommendation, but it raises a suspicion that this screwdriver may damage the pentalobe screw heads. Personally, I'd go to ifixit.com and spend the extra money for a proper pentalobe. A well-made tool is a joy to own, and can pay substantial dividends in quality of workmanship.
     
  6. Texas_Toast thread starter macrumors 6502

    Texas_Toast

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    #6
    I agree, but what is the solution then? :(
     
  7. ApfelKuchen macrumors 68020

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  8. Texas_Toast thread starter macrumors 6502

    Texas_Toast

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    ifixit's website doesn't show any pictures of their screwdriver head.

    From what I can tell, they also only offer a pointed star design.

    That and I have a gripe against ifixit... They once asked me to fax my driver's license for an order under $50 and so I will not be making any purchases from them. I live in Texas damn it! Screw ifixit.
     
  9. Gjwilly macrumors 68030

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    #9
    Wiha makes an actual pentalobe driver.
    Their quality is top notch.
     
  10. Texas_Toast thread starter macrumors 6502

    Texas_Toast

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    #10
  11. Gjwilly macrumors 68030

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    #11
    You're comparing a simplified 2D birds-eye view with an actual 3D object.
    A star with 5 sharp points is wrong but 5 perfect little arcs is also wrong.
    That's just not how it works in the real world.
     
  12. Texas_Toast thread starter macrumors 6502

    Texas_Toast

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    #12
    In post #10, it was *implied* that based on the two links that I provided that the screwdriver from Wiha is NOT a pentalobe...

    So I wasn't wrong.

    I'm still waiting on you to provide me a link showing me a true pentalobe screwdriver.

    Based on my research, nobody makes one except maybe Apple themselves...
     
  13. JohnDS macrumors 65816

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    #15
  14. Texas_Toast thread starter macrumors 6502

    Texas_Toast

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    #16
    The reviews don't tell anything about my concerns...

    And it appears that @Gjwilly also doesn't think those screwdrivers are the same as a true (flowery) pentalope pattern...
     
  15. JohnDS macrumors 65816

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    #17
    Perhaps Gjwilly can clarify his comments. I did not read them to mean that. The 47 reviews on Amazon of the Wiha screwdrivers are almost universally excellent, for instance :

    "Yes they are probably the most expensive pentalobe drivers on Amazon. But these fit the screws perfectly. They are forged in an accurate shape for the screws. (Some drivers have star shapes instead of the pentalobe shapes.)"
    and

    "Pro:
    + Real Pentelobe drivers.
    + Fits the screws perfectly. I don't need to worry about striping these screws. Other sets or drivers include a '5-star' that have have play to them. I can definitely see myself striping these screws considering the amount of torque I had to apply to loosen these.
    + Apple stores use these drivers. If they're good enough for Apple, they're good enough for me."
    and

    "These are the absolute best drivers for Apple and Mac products on the market. yes they are pricey but if you do a lot of tech work like me you will NOT be stripping screws like with other drivers! Super products!"
    The only real complaints are about the price.
     
  16. Gjwilly macrumors 68030

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    #18
    Trying this one more time.
    If you took your Wikipedia drawing and created a screwdriver tip that perfectly matched it you'd have a hard to use, very impractical tool. The screwdriver would only work if rotated to the precise angle so that the lobes on the driver aligned with the lobes on the screw. You'd also have to insert the driver at an exactly 90-degree angle or the edges of the lobes would hang up and you'd either damage the tool or damage the screw.
    What you see from Wiha is the real world example of a driver designed to fit the pentalobe screw easily and without damage to the screw or the driver.
    The cheaper versions with the 5 sharp points will quickly deform or damage the screws.
    Apple might have a driver that more closely matches the Wikipedia image on an assembly line somewhere where the driver is automated and the parts are held stationary but I highly doubt it.
    The Apple tech in the back of the Apple Store is using a tool that matches the Wiha.
     
  17. ApfelKuchen macrumors 68020

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    #20
    As noted, it's not likely that they could match precisely - there always has to be a bit of "play." In this case, the only apparent deviation from the theoretical is that the 5 "points" don't taper to sharp points. They've been squared-off and chamfered, which is likely necessary, both to do less damage to the screw head and to aid insertion/removal. However, the recesses are curved in a manner that would seem to match the curves of the screw head.

    Effectively, the Wiha bit is the opposite of the 5-pointed star design - there will be broad contact with most of the screw head, lacking only contact at the points.
     
  18. DeltaMac macrumors 604

    DeltaMac

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    #21
    tl;dr
    If you buy a pentalobe driver that is advertised to be the correct type used in a Mac, then you will be good (doesn't really matter what the shape of the driver head is, flower/star, as long as it works.) Get the tool from a reliable source, and you will be good to go.
    (post #19 is good, too)
    (I like the Wiha tool, Wiha knows hand tools.)
    Ideally, the "flower-type" shape will best fit the pentalobe, as it is designed as a security screw, and has tiny "ramps" as part of the screw design. The "star" design is possibly not quite right, but will remove/tighten the pentalobe screws perfectly, as long as the head size is correct for the screw.
     
  19. Texas_Toast thread starter macrumors 6502

    Texas_Toast

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    #22
    I didn't read all of the reviews, but they do sound positive.

    My concern above was that after looking at the same link you provided for the screwdriver, it didn't look like it matched the actual shape of the true pentalobe screw that Apple uses.

    (If you search online, a lot of places call Torq and the star design "pentalobe" which is not only confusing, but deceptive.)

    If the screwdriver works, I guess it doesn't matter what it looks like or is called, but based on my research yesterday, I was becoming very disappointed with the search results I saw.
    --- Post Merged, Nov 11, 2016 ---
    I don't disagree.

    Okay.

    Agreed.


    Okay.


    Okay.
     
  20. oneMadRssn macrumors 68040

    oneMadRssn

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    #23
    I own the iFixit kit, and I can confirm the pentalobe screwdrivers are rounded flower-shaped tips. I have also used both sizes to open various iPhones and Macbooks. They work very well.

    Avoid the cheapo screw-drivers from Amazon and ebay. The tolerances are not so good, so you risk stripping the screws. Also, they are very soft, so the driver head gets worn out after only a few screws.
     
  21. Texas_Toast thread starter macrumors 6502

    Texas_Toast

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    #24
    If all of these manufacturers would have a close up (macro) shot of their screwdriver tips, then I wouldn't have needed to start this thread... :rolleyes:

    I assume that any of these kits would be the same as what @Gjwilly and others recommended on Amazon, right?

    http://www.ebay.com/sch/i.html?_fro...+Pentalobe+Screwdriver+Set+(PL1-PL6)&_sacat=0
     
  22. JohnDS macrumors 65816

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    #25
    I wouldn't trust the cheapies. Get the Wiha.
     

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