Suzuki outboard motors 1988 2003 repair manual., Page 15Get this manual
TOOLS AND EQUIPMENT 2-15 In all cases, be absolutely sure you have selected the proper replacement Don't be shy, you can always ask the store clerk for helpBe aware that when you find bolt with damaged threads, you may also find the nut or drilled hole it was threaded into has also been damagedIf this is the case, you may have to drill and tap the hole, replace the nut or otherwise repair the threadsNEVER try to force replacement bolt to fit into the damaged threadsFig45 Thread gauges measure the threads-per-inch and the pitch of bolt or stud's threads