that new np spreader does look interesting so i checked it out on their website.
then i found this information:
finally settling on a forged aluminium architecture for best strength and weight balance and anti-corrosion properties.
anybody know what kind of screws they are using (material wise)?
This bar will be a breakthrough development in spreader bars... if it holds up. I would like to know if the hook is also made of aluminum.
The fastener in the bottom of the hook assembly looks like a rivet.
It seems like the issue of durability would center around (1) resistance of deformation of the hook (if it is aluminum), (2) sand abrasion of the anodization, exposing the bare aluminum to salt water, and (3) electro-corrosion between fastener ( maybe stainless steel) and base material (aluminum).
What do you metallurgists think? I am not a metallurgist or an engineer, but someone who will watch with interest this new development in spreader bar technology.