The Ford Barn - View Single Post - Difference with two banjo rear spider gear housing/ring gear bolts

Bruce_MO · 01-10-2026, 04:29 PM

I’m no expert on fasteners, but my experience with the Marzden nuts in your first photo is that used nuts don’t seem to have much of a “locking” feature after having been installed. I’ve never had any back off yet (new or used), but they sure seem to go on all the way with no change in resistance, definitely not feeling like they’re locking and won’t back off. I have assumed that the split tops on the nuts were maybe upset a bit to provide resistance to backing off, but maybe they resist loosening by some other means. Would love to be educated on that.

Bottom line is I’d use the castle nuts and safety wire for that application, and any others where loosening would be a big failure.

01-10-2026, 04:29 PM	#2
Bruce_MO Senior Member Join Date: May 2010 Posts: 592	Re: Difference with two banjo rear spider gear housing/ring gear bolts I’m no expert on fasteners, but my experience with the Marzden nuts in your first photo is that used nuts don’t seem to have much of a “locking” feature after having been installed. I’ve never had any back off yet (new or used), but they sure seem to go on all the way with no change in resistance, definitely not feeling like they’re locking and won’t back off. I have assumed that the split tops on the nuts were maybe upset a bit to provide resistance to backing off, but maybe they resist loosening by some other means. Would love to be educated on that. Bottom line is I’d use the castle nuts and safety wire for that application, and any others where loosening would be a big failure.