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Tool Talk Discussion Forum

Not a Torx bit?

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Iowa Dave

09-27-2003 18:35:07




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Just bought a Continental Cargo enclosed trailer. Need to do some minor repairs. The whole thing is assembled with some type of machine screw, probably self-tapping. My assortment of torx bits don't fit them. Looks like an 8-pointed star. Do these things &/or the tool needed for them have a name?




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JoeK

09-30-2003 09:37:29




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 Re: Not a Torx bit? in reply to Iowa Dave, 09-27-2003 18:35:07  
There used to be 8 splined screws used in older electronics and setscrews,called a "Bristo" sockethead screw.Drivers came in screwdriver type or set like allen(hex)keys.Bits looked like lil tiny tractor PTO shafts(square cut splines)..



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Iowa Dave

09-28-2003 18:02:07




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 Re: Not a Torx bit? in reply to Iowa Dave, 09-27-2003 18:35:07  
Thanks for all the input! I managed to get a loose one out with a phillips head, will let ya' know what it takes after I comb the greater Des Moines area.



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JOHN (LA)

09-28-2003 12:21:38




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 Re: Not a Torx bit? in reply to Iowa Dave, 09-27-2003 18:35:07  
It is a star with eight points or like it has two philips heads in the top of the same screw. This is a PZ head; if memory serves me right. Comes in sizes PZ1-PZ2-PZ3.
A Square drive will NOT fit it no more than a allen wrench will fit a trox even though both are six sided.
The bit is a round stud with eight v shaped bumps on it. Only place I know to get some is a tool manufactuare like snap on or mac.If you have many to do get the right bit.
I have also seen a cheep set with 4 sided bits.(looks just like a philips) If you do not have many to remove you may try a tight fitting phllips. These bits really play h##l on the screw heads though. Screw will probley not be able to be reused.

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Stick

09-28-2003 10:33:49




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 Re: Not a Torx bit? in reply to Iowa Dave, 09-27-2003 18:35:07  
Sounds like what's used in lots of camper trailers. A Robertson (square) bit fits it. Being from Canada, that's about all I ever use is Robertson screws. I'll never understand why the rest of the world never adopted them.



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JoeK

09-28-2003 07:37:57




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 Re: Not a Torx bit? in reply to Iowa Dave, 09-27-2003 18:35:07  
Can't think of the name offhand but they have been around awhile,maybe even before Torx.Trailer dealer may have them available,or check lumber yard/home stores for bit,as there is a "new type" imported power drive/lagscrew selection which I believe uses this 8 spline driver.
Ain't it amazin how the fastener mfgs keep comin up w/new/improved ideas(for the tool manufacturers)



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John Ne.

09-28-2003 08:16:50




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 Re: Re: Not a Torx bit? in reply to JoeK, 09-28-2003 07:37:57  
Could be a spline-drive, check the snapon tool catalog.



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Bus Driver

09-28-2003 04:48:13




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 Re: Not a Torx bit? in reply to Iowa Dave, 09-27-2003 18:35:07  
Some fasteners now use the Robertson (square) drive for installation and the heads also have Phillips slots for customer removal later if necessary. These screws might have a combination pattern such as this. Test it with a Phillips screwdriver.



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Slowpoke

09-28-2003 01:02:09




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 Re: Not a Torx bit? in reply to Iowa Dave, 09-27-2003 18:35:07  
There are at least 12 different torx sizes. They are 6 point and can be plain, or tamper proof, which has a pin in the center, requiring a matching hole in the end of the driver.
The common sizes are: T10, 15, 20, 25, 27, 30, 40, 45, 47, 50, 55, & 60. Most sets do not include all sizes. The newest thing is a star head that replaces the standard hex head on bolts. They require a matching socket using a 1/4" or 3/8" drive. Grainger lists three types of trailer floor and wall screws, all using Torx drive, one being a T30 size.

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