What is the difference between Z and ZZ bearings?

Bearings types difference - RepRapHi, I want to ask what is difference between 2RS and ZZ bearing. First use 2 rubber seals second metal shield, but why first type cost a lot more 

Bearing Closures - Bearing Seals and Bearing Shields | ASTThe team at AST Bearings offers bearing closures from bearing seals to bearing shields to extend Type ZZ - Non-removable, non-contact metal shield retained in the outer ring via crimping, or pressing. The code for a single shield is Z2RS or ZZ ? - SOHC/4 Owners Club ForumsIf you need one of these bearings without 2RS or ZZ, buy the 2RS Thanks, it helps as far as what the difference between the two is, but I'm 

Bearing Numbers and Types Explained - Engineer StudentRS provides a better seal but more rolling friction than 2Z. RS, Bearing with rubber seal on one side, one side open. 2 Z / ZZ, Bearing with a metal seal on both 

Bearing Numbers Meaning |Bearing numbers can seem very confusing and random to the average person. But there is a system to all the madness! There are several numbering systems used in the bearing industry today. The boundary Z, Single Side Metal Shield. ZZ, Both Sides Metal Shield. RS, Single The difference is mainly caused by:Dummies Guide To Miniature Radial Ball Bearings And TheirJun 14, 2015 — Comparison of shield, sealed and no-seal bearing. Type, Symbol, Properties, Cost, Description. Shield, Z, They have fair dust resistance and poor water resistance. Shields are There is a small gap about .005 inches between the shield and inner race. There is no 608 ZZ, Shields on both side. 608 RS 

Deep Groove Ball Bearings - Bearing KingDeep Groove Ball Bearings - Basic understanding of the most common bearing. Single row deep groove ball bearings are used in a wide variety of applications, they are simple in design, ZZ = Shields on both sides. Z = Shield on one sideBearings : ZZ vs 2RS - Advice - V1 Engineering ForumNov 23, 2019 — Both the 608ZZ and 6082RS bearings should be a good choice for the MPCNC building. I have lot of ZZ bearings but I'm wondering if the 2RSs 

Customer Questions & Answers What is the difference between the z and zz? 6203z vs 6203zz Z designates the bearing shield, zz is a two sided shield bearing. A single sided shield bearing, Why do we use a ZZ bearing? - QuoraHave you ever wondered what the difference was between roller bearings and ball bearings? At first glance they may not seem all that different. However, these