Re: Resurrecting a 1951 Henney-Packard Parts Car

Posted by Packard Don On 2020/7/13 18:25:41

Yes, the fillet is a common thread relief and for strength as a square corner would fracture. However, I'm beginning to believe that it has nothing to do with the question at hand.

With the threads at 7/8" (actually slightly less than .875") and the bottom of the fillet being about .81, that's a considerable difference over which to press a hard washer.

Putting the drum back on, I realized that the washer's tang is external and that the depth between the face of the drum and the end of the taper is almost 1/8" so the washers must be about 1/8" thick and I would bet that the inside diameter is 7/8". Any settling into the groove is likely from wear.

These dimensions, of course, would apply only to Henney Packards.