what is the 1975 c30 dually front wheel stud Knurl size?

[jarrodblake]

what is the front wheel stud Knurl size for a 1975 c30 dually? on autozone and advance auto it says its .623 Knurl. I need longer studs in the front to fit my 19.5 wheels. I ordered Dorman Pik-A-Nut 9/16-18 Serrated Wheel Stud, .623" Knurl, 2-7/16" Len 610-300.1. but the knurl is to big can anyone confirm that I need a .623" Knurl and that they just sent me the wrong one, or I need a different size knurl?

[kwmech]

How much longer does the stud need to be? According to my dorman book the .623 is correct. The 610.300 stud is longer but is missing the first 3 threads. The next longer size up is a 610-347 with a .625 knurl which will press in fine. It is shy of 3'' long by 1/8''

[jarrodblake]

Originally Posted by kwmech

How much longer does the stud need to be? According to my dorman book the .623 is correct. The 610.300 stud is longer but is missing the first 3 threads. The next longer size up is a 610-347 with a .625 knurl which will press in fine. It is shy of 3'' long by 1/8''

Thanks for the reply I finally got my digital caliper working, the circuit board was corroded, they sent me the wrong stud. the stud they sent was .655. That said the stud they sent was the perfect length and thread. now I just need them to get back to me before I order the full set with the correct knurl size.

[kwmech]

The 610-347 is 3/8'' longer

[jarrodblake]

Originally Posted by kwmech

The 610-347 is 3/8'' longer

Ill order one and see if the length works better thanks.