BRONZE; 3.505 MIN TO 3.555 MAX IN. ID UNTHD PORTION 3.98 MIN TO 4.02 MAX IN. OD HUB END 3.76 MIN TO 3.805 MAX IN. OD FWD END 1.66 MIN TO 1.72 MAX IN. H O/A 0.25 MIN TO 0.28 MAX DIA WRENCH HOLES; SHAFT 50 THD 3.437 IN.-12 12N OR UN CL 3B THD OR CL 3 FIT 1.063 IN. LG