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Posted by Doug in CO [68.177.210.73] on Thursday, August 05, 2010 at 14:33:52 :
In Reply to: Re: O.T. Three-tooth phillips bits? posted by D Sherman [72.47.9.228] on Thursday, August 05, 2010 at 10:50:47 :
Phillips Screw company is a few guys who control the OLD patent of Phillips. It expired so they came up with "ACR Phillips".
There are a few recesses in aerospace along with this: "hi torque" a weird hour glass recess used in older B-52's, "torque set" used VERY common about everywhere which is an "offset" phillips, "ACR 'phillips' which is a tiny little ribs put in the "out" side of phillips hence "Anti Cam Ribout" to supposedly keep the driver IN the recess during removal, list goes on.....