Nick, The main reason is the level of vibration acc to my knowlegde..Coarse threads don %t loosen up that fast when their exposed to vibrations. There sure are some other reasons, like in the front suspension for entering hairpins etc without loosen or thighten the nut to much before the hairpin enters..and of course vibration occurs in the suspension to.. Regards Viggo 57 CR drt-rdr@xxxxxxxxxxxxxxxx on 05/14/2001 05:36:00 PM To: L-FORWARDLOOK@xxxxxxxxxxxxx@Internet cc: (bcc: Viggo Holt/AkerMaritime/akernet) Subject: [FWDLK] Coarse VS Fine Can someone explain why the difference between why there are fine and coarse thread bolts and why they are used in different places. For example, I needed to new bolts that hold my generator to the bracket. the originals are fine thread, the store only had coarse thread. So is it ok to interchange ? Nick |