Classifications of playground fasteners？

There are different classifications of fasteners from different perspectives.
According to the process, there are casting fasteners, stamping fasteners, and forging fasteners
According to the implementation standards, there are national standard fasteners, British fasteners, Japanese fasteners, German fasteners, American fasteners, etc.
According to surface treatment, there are spray paint fasteners, electro-galvanized fasteners, and hot-dip galvanized fasteners.
According to the purpose, there are cross fasteners, steering fasteners, butt fasteners, pig ear fasteners, suspension beam fasteners, fixed plate fasteners, etc.

According to material,  main material is aluminium, steel, stainless steel, PE plastic. such as: Playground fasteners including aluminium rope connectors, aluminium rope cterminations, steel rope fasters. aluminium / PE playground feet base,  aluminium playground fasterners,  PE/ resin climbing holds etc…