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Pozidriv screws on HP covers

Chuck Harris All Messages By This Member #129592 Since nobody seems to have mentioned it, Pozidriv screws can be identified by a cross type screw slot, with a set of fine lines stamped in the head in between the crossed slots (a cross and a cross...). JIS have a single dot stamped in the head between two of the slots. Pozidriv screw slots have square sides, which makes it unlikely that the bit will cam out of the screw's slots... And, makes it incompatible with phillips screw drivers. To get the square sides on the driver bit, they have to use a narrower grinding wheel, which leaves 8 facets on the screwdriver (as opposed to the Phillips 4 facets.). JIS and pozidriv bits usually break when the torque is exceeded. You have been warned. Torx and square drive are the kings of readily available high torque screws. Allen is a distant second. -Chuck Harris On Sat, 17 Sep 2022 18:26:32 -0500 "Steve Holland via groups.io" <sholland@...> wrote: People: I keep learning useful stuff on these threads even when looking at posts about equipment I don’t own. Pozidrive screws: Great tip! Steve
搁别苍é别 All Messages By This Member #129595 开云体育 FYI -square drive also known as Robertson Drive ( named after the inventor early last century)...great drive method! 搁别苍é别 On 9/17/22 5:16 PM, Chuck Harris wrote: toggle quoted message Show quoted text Since nobody seems to have mentioned it, Pozidriv screws can be identified by a cross type screw slot, with a set of fine lines stamped in the head in between the crossed slots (a cross and a cross...). JIS have a single dot stamped in the head between two of the slots. Pozidriv screw slots have square sides, which makes it unlikely that the bit will cam out of the screw's slots... And, makes it incompatible with phillips screw drivers. To get the square sides on the driver bit, they have to use a narrower grinding wheel, which leaves 8 facets on the screwdriver (as opposed to the Phillips 4 facets.). JIS and pozidriv bits usually break when the torque is exceeded. You have been warned. Torx and square drive are the kings of readily available high torque screws. Allen is a distant second. -Chuck Harris On Sat, 17 Sep 2022 18:26:32 -0500 "Steve Holland via groups.io" <sholland@...> wrote: People: I keep learning useful stuff on these threads even when looking at posts about equipment I don’t own. Pozidrive screws: Great tip! Steve
saipan59 (Pete) All Messages By This Member #129597 On Sat, Sep 17, 2022 at 06:16 PM, Chuck Harris wrote: Torx and square drive are the kings of readily available high torque screws Question: Is Torx and "star drive" the same thing? Perhaps the only difference is that Torx is trademarked?? Pete
Dave McGuire Member Profile All Messages By This Member #129607 On 9/17/22 22:23, saipan59 (Pete) wrote: Torx and square drive are the kings of readily available high torque screws Question: Is Torx and "star drive" the same thing? Perhaps the only difference is that Torx is trademarked?? Yes. Look at the people who call Torx "star drive" with the same derision as you would the people who equate Phillips, PoziDriv, and JIS and call them all "crosspoints". -Dave -- Dave McGuire, AK4HZ New Kensington, PA
David C. Partridge Member Profile All Messages By This Member #129613 Star drive and Torx are NOT the same. toggle quoted message Show quoted text -----Original Message----- From: [email protected] <[email protected]> On Behalf Of Dave McGuire Sent: 18 September 2022 05:44 To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] Pozidriv screws on HP covers On 9/17/22 22:23, saipan59 (Pete) wrote: Torx and square drive are the kings of readily available high torque screws Question: Is Torx and "star drive" the same thing? Perhaps the only difference is that Torx is trademarked?? Yes. Look at the people who call Torx "star drive" with the same derision as you would the people who equate Phillips, PoziDriv, and JIS and call them all "crosspoints". -Dave -- Dave McGuire, AK4HZ New Kensington, PA
Robert G8RPI All Messages By This Member #129618 Vintage HP equipment certainly used Phillips head fastners. I wonder when they changed. With System II maybe? Having worked in aviation as well as electronics and also had an interest in cars I've had to deal with a lot more than Philips, Posidrive? Hex and Torx. For example Spline (Various number of points larger sizes). Bristol Spline ( Small sizes Allen key / Torx like but parallel sided flanges used on some early HP shaft hardware lih gears and knobs also Collins & Juke boxes) RIBE / Polydrive (Variation on spline with rounded ends used by Fiat and some GM) XZN aka triple square Various "security" bits and variations For Aerospace: Tri-wing Tripoint Torq-set Hi-Torq (particuarly prone to damage, looks like a simple slot but bottom of slot is curved and sides are undercut. Tool has a dovetail) SWT B.N.A.E aka French Recess. Robert G8RPI.
Raymond Domp Frank Member Profile All Messages By This Member #129619 On Sun, Sep 18, 2022 at 04:23 AM, saipan59 (Pete) wrote: Is Torx and "star drive" the same thing? Perhaps the only difference is that Torx is trademarked?? We're all contributing very fragmented information. There's a pretty good Wiki topic about this: Raymond
Dave McGuire Member Profile All Messages By This Member #129622 People everywhere have used the terms interchangeably for decades. They are effectively the same, if not actually. -Dave toggle quoted message Show quoted text On 9/18/22 01:34, David C. Partridge wrote: Star drive and Torx are NOT the same. -----Original Message----- From: [email protected] <[email protected]> On Behalf Of Dave McGuire Sent: 18 September 2022 05:44 To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] Pozidriv screws on HP covers On 9/17/22 22:23, saipan59 (Pete) wrote: Torx and square drive are the kings of readily available high torque screws Question: Is Torx and "star drive" the same thing? Perhaps the only difference is that Torx is trademarked?? Yes. Look at the people who call Torx "star drive" with the same derision as you would the people who equate Phillips, PoziDriv, and JIS and call them all "crosspoints". -Dave -- Dave McGuire, AK4HZ New Kensington, PA
F1EKU All Messages By This Member #129632 If I remember correctly, the introduction of Torx screws was made by HP around 1990, at the same time as the patent for Torx screws became public domain.
Dale Chayes/KB1ZKD All Messages By This Member #129635 开云体育 Can’t speak to the facts but recall seeing them earlier.? Says 1967 -Dale toggle quoted message Show quoted text On Sep 18, 2022, at 15:00, F1EKU <rfconsulting.fr@...> wrote: ?If I remember correctly, the introduction of Torx screws was made by HP around 1990, at the same time as the patent for Torx screws became public domain.
F1EKU All Messages By This Member #129641 Introduced in 1967 but patented until around 1990. Once the patent is in the public domain, HP (and every other user) no longer has to pay to use it.

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