I got some 5001T(?) nuts in 7/16 UNF (supposedly for a Lexus!) from USA, and 25% were useless because the threads were not concentric with the shanks- supplier is sending replacements. These were supposed to have 0.73" shanks, but were only that size where they had been knurled to retain the washers. The rest was 0.715" . I turned the shanks down to 0.695" and thats a good fit in the 14" S2 SD1 wheels. The shanks are a bit longer than SD1, but wont bottom.