I have 1958 GMC 370. Last time it was on the road was 1981. The Driver front brake was stuck. The tire was removed and lug nuts put part was on, and left on the ground. I Replaced the wheel. Now the lug nuts only screw part way on. I put a wire wheel on a drill but not much help. So my next thought was to get a 3/4 tap and die to clean up the threads on the studs and lug nuts. So my question is. I know it left hand threads and I think it 3/4... but what is the thread count? I went to a local auto parts store and the guy said it was 14. I'm pretty sure thats wrong. Since I have to order it online. I want to make sure I order the right one. Any Help Please
Last edited by Roberts Big Hous; 06/27/20221:47 AM.
a 3/4" UNF (Unified National Fine) thread is 16 threads per inch. You're about as likely to find a lefthand die in that size in a local parts store as finding a chicken with lips. The place I go for machine tooling and equipment and parts is Victor Machinery Company. (www.victornet.com). They have a minumum dollar amount for an online order- - - -don't remember what it is, but it's fairly low. I'd suggest going online somewhere like Ebay and buying a thread pitch gauge. They're available in both inch and metric sizes, and every tool box should have a few items like that. Ditto for a dial or digital caliper, preferrably one that can measure in both metric and inch dimensions. Like it or not, metric is the common measuring system, and America was at least 50 years behind the rest of the world in switching to metric measurements. Everybody else did it after WW II. Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!
Another rough way just to double check the thread pitch, is to take a good machinist rule or a good tape measure and count the number of threads in one inch. Dial calipers are real handy around a shop as Jerry said and a thread pitch gage will tell you for sure the threads per inch.
Don
1967 GMC 9500 Fire Ladder Truck "The Flag Pole" In the Stovebolt Gallery 1946 2-Ton grain truck 1946 3/4-ton pickup, 1953 1-ton pickup 1957 1-ton flatbed dually, 1954 Pontiac Straight Eight Of all the things I've lost in my life, I miss my mind the most!
Are they stud piloted? If so it is till a common nut in the trucking industry. The Euclid number is E-5652-L. This is a current number and can be crossed over to other brands.
To chase the threads, buy an extra nut and split it to use it for a thread chaser. Or you can buy a thread chaser.
