View Full Version : Shop made carriage bolts

09-10-2007, 07:39 PM
Some time ago I pulled some Backbone Bolts out of a little ( LMAO ) project that were being replaced along with just about everything else. Made of Bronze ( still don't think they're silicon-bronze though )they were in remarkable condition, and were quite easy to remove. This was also aided by lead caked packing under the heads

I did some cut-aways to look at how they were constructed and to find out why the formed head cracked when I pulled out. Neat looking stuff.
Mind you, these were installed in 58'

Sorry for the quality, old camera when I took the pics.


I had drilled out the head, hoping to loosen the ring but no go

09-10-2007, 07:45 PM
After a little bristle cleaning of course, but those striations were from the maker grinding the shape.


09-11-2007, 02:49 AM
Any idea what alloy that clench ring is ?
( why not post this up in Building ...it's a useful photo)

Jim Ledger
09-11-2007, 08:41 AM
It might be a clinch ring made out of a piece of propeller shaft, bored, countersunk and hacksawed off.

George Ray
09-11-2007, 10:43 AM
So the reddish colored metal is the clench ring/washer?
At first I thought that part of the fastening head was suffering from electrolysis hence the red color (dezincification). It would be interesting to see a picture of the joint that this fastening was used in to better understand it.

Interestng, Thanks