Is this fitting brass, bronze or DZR?

[GrahamHR]

I took the back nut off and dropped it on the floor, quite a nice ring to it.

None of this is conclusive enough for me. I'll buy new bronze.

Buy a good quality plastic one (yes, I know most metals behave in a plastic way ), so I mean a polymeric one, Corrosion free, not corrosion resistant, no ambiguity,

 

[Len Ingalls]

https://coxengineering.sharepoint.com/pages/brassandbronze.aspx

Excellent article on brasses & bronzes including DZR.

Thanks for replies on the "drop tests".

Good bronze is harder than cheap brass & should be easily detected by tapping on it or dropping,etc.
Problem is that both brasses & bronzes are formulated in various compositions so testing is not always that easy.

One point is that good bronze fittings are usually cast & then machined. The casting roughness is usually visible in non-machined areas.

Cheers / Len

 

[burgundyben]

Buy a good quality plastic one (yes, I know most metals behave in a plastic way ), so I mean a polymeric one, Corrosion free, not corrosion resistant, no ambiguity,

I would do that, but its an older wooden boat, aside from some of the plastic skin fittings not being recommended for wooden hulls, I suspect the market would frown upon it if I wanted to sell.

 

[charles_reed]

Probably brass - no certain way of telling - good for 5-8 years in most waters.

To be sure, start now and get composite (Marelon etc), fittings.
Lighter, no doubts about galvanic on any other form of corrosion, don't seize and less expensive.