12
SBL:
Housing: steel, turned, zinc-plated, blue passivated
Ball: steel, bare
SNI:
housing: steel, turned, zinc-plated, blue passivated
ball: stainless steel, stainless, 1.4034
NNI:
housing: stainless steel, 1.4028 and Material No. 1.4305 (only size 15)
ball: stainless steel, stainless, 1.4034
Housing: steel, turned, zinc-plated, blue passivated
Ball: steel, bare
You do not have a support collar, but take the load on the housing diameter d2.