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T-47 Torx Fastener

T-47 Torx Fastener

T-47 Torx Fastener

(OP)
The T-47 bit seems to be an oddball, as it is only about .012" smaller lobe to lobe than the T-50. It also does not seem to appear on many listings of Torx sizes. Anybody know what the deal is?

RE: T-47 Torx Fastener

I am not aware of T47.  It is not a standard on either the original Camcar (Acument) documents or in ISO 10664.  T45 and T50 are standards.  All of the original Torx information can be downloaded from the Acument website.  The following is the specific document on driver bits:

http://www.acument.com/licensing/pdfs/standards/torx/drivers/metric/TMD-702.pdf

RE: T-47 Torx Fastener

I think this is a special for GM.  GM liked to skirt patent and licensing fees, so they sometimes did weird things.  For example, they did special hexalobular designs that weren't quite Torx, and I think this is one of them.

Regards,

Cory

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RE: T-47 Torx Fastener

Yep, Corey is right.  This is not anything that was created by Camcar or any of the Torx licencees.  I think this is a foolish part that GM came up with.  He's right that it isn't a true Torx but a 'made up' shape that is similar to a Torx. In most cases you should be able to use a T-45 to work in these parts.

RE: T-47 Torx Fastener

Yeah, if I remember right, it has the same radii for inner and outer lobes, whereas the original Torx has inner lobe radii that are twice as large as the outer lobe radii.

Regards,

Cory

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