Selection guidelines for SKF capping devices for stainless steel deep groove ball bearings

Requirement	Shields	Non-contact seals	Contact seals
	Z, ZS	RZ	RS1
Low friction	+++	+++	O
High speed	+++	+++	O
Grease retention	O	+	++
Dust exclusion	O	+	+++
Water exclusion
static	–	–	++
dynamic	–	–	+
high pressure	–	–	O

Symbols:
+++ = best
++ = very good
+ = good
O = fair
– = not recommended