Larger Torx drivers won’t fit in smaller Torx fasteners, but smaller drivers will. I have done this with torx screws using power tools running out of T25 bits vs. wasting time getting more T25s. A T27 bit would not fit, but a T20 bit worked well getting damaged. I fail to see how a T9 driver would work in a T8 fastener unless the fastener is cheaply made. Is that Apple? No!
From what I see, the size is a T9, where the teardown tech had the correct size, but the write up grabbed a T8 which worked slightly loose, but didn’t have the expert knowledge, listing the size incorrectly as T8. The result would be slight damage to both the fastener and the driver. Unless of course the driver was from one of the German or Swiss tool companies - Wiha, Witte, Wera, PB Swiss, etc. Eventually an inferior tool (one made with a softer metal that is not hardened) would get damaged enough needing to be replaced - good for business aye? A true quality tool fits snug enough to hold the fastener without magnetism.
There is a Torx Plus screw with lobes that are more square, allowing for higher torque and minimizing wear. Torx Plus drivers can't fit into standard Torx screws, but standard Torx drivers can drive Torx Plus screws, however, not to full torque due to the loose fit (cheap bits or drivers will get rounded). There is a security version of Torx Plus that has five lobes (instead of six) with a post in the center.
Other variants exist such as Torx Plus Maxx Stems, Torx TTAP, even a tamper-proof Torx fastener called AudiTorx. It has a concave and smooth fastener head with a break-away Torx drive on top - it will snap off when the engineered torque is reached leaving a rivet-like bolt head that is difficult to remove. Scary.
Rumored is that Apple contracted a German company to specially make security Torx Plus screws for the 2014 MacMini to make it hard to get inside, so more MacMinis can be sold - in essence making it a disposable product. If so, Apple is shrewd!
So what Torx version is really in this machine?
At the beginning of this article under “Tools Featured in this Teardown”, a Torx T8 is listed. However, in the photo shown in this step (step 14) a Torx T9 is shown. Is there a reason for this?
Please don't tell me that this is a technique IFIXIT is using to sell more items. Or is it really just a careless mistake that they didn't care to fix? I did see on other MacMini videos that the real size needed is a T9.
Can anyone verify this?
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