Re: Torque specs for wheel lug nuts packard twelve

Posted by Tim Cole On 2021/9/4 9:51:56
Really no need for snide remarks here.

Unfortunately the parts book doesn't specify the dimensions, so I would address your concern by taking off a drum with the wheel bolted to it and checking the depth of penetration of your bolts. However, I think those are blind holes so that won't work. An alternative is to stick a piece of wire or something into the hole to measure the depth. Your concerns are well founded as for the earlier cars Packard had a multitude of part numbers for those bolts.

If you want to size a fastener you can fit the open end of a wrench over the thread to determine your specification. For example if a 9/16 wrench fits the threaded portion that is a 9/16 bolt. If you have a thread gauge or a thread file you can then determine the thread pitch. On a thread gauge it is a number, say 21, or if you take it to a hardware or auto store that has open fastener stock you can find out that way.

Metric works the same way. A 6mm X 1.mm metric fits a 6mm wrench on the shank and, say, a 10mm wrench on the hex.

1/4-20 will take a 1/4 inch open end wrench on the shank and a 7/16 wrench on the hex. The 20 is the number of threads per inch which you can also count with a ruler. I miss the old USS/SAE systems where everything is in 16ths of an inch. Metric always bugs me because I hate French imperialism.

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