What Are Our Concerns About Bearings（31）

Q1: What is the bearing code for outer diameter 12 and inner diameter 4?

A:Bearing codes with inner diameter =4mm and outer diameter =12mm are:  

• 1. 604 (Open deep groove ball bearing, external dimension 4*12*4mm)  
• 2. 604-Z or 604-2Z (deep groove ball bearing with dust cover, external dimension 4*12*4mm)  
• 3. 604-2RS (Deep groove ball bearing with sealing ring, external dimension 4*12*4mm)  
• 4. GE4E (single slit outer ring radial joint bearing, external dimension 4*12*5*3mm) GE4C (Type C self-lubricating radial plain bearing, external dimension 4*12*5*3mm)

Q2: What are the types of bearings?

A:Centripetal bearings, thrust bearings, liquid lubricated bearings, incomplete liquid lubricated bearings, non-lubricated bearings.  Self-aligning ball bearings, self-aligning roller bearings, tapered roller bearings, double row deep groove ball bearings, thrust ball bearings, deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings, needle roller bearings. 

Q3: What type of deep groove ball bearing is outer circle 42 inner circle 25?

A:It is 6905 or 61905 bearing. The thickness is 9.

Q4: Which bearings are a class of bearings?  What are type II bearings?  How is it distinguished? 

• ◆0-double row angular contact bearings  
• ◆ 1 — Self-aligning ball bearing  
• ◆ 2 — Self-aligning roller bearings and  Thrust self-aligning roller bearing  
• ◆ 3 — Tapered roller bearings  
• ◆ 4 — Double row deep groove ball bearings  
• ◆ 5 — Thrust ball bearing  
• ◆ 6 — Deep groove ball bearings  
• ◆ 7 — Angular contact ball bearings  
• ◆ 8 — Thrust cylindrical roller bearing  
• ◆ N — Cylindrical roller bearing  
• ◆ U — External spherical ball bearing  
• ◆ QJ — Four point contact ball bearing  

Q5: Bearing 63/28/P53, what do the numbers mean respectively?

A:6 represents deep groove ball bearing 3 series code medium bearing 28 Inner diameter size 28mm P5 bearing precision P5 class 3 represents clearance level C3 group clearance.

Q6: What kinds of products can the bearing industry be divided into?

A:Rolling bearings are divided into 2 categories: centripetal bearings, thrust bearings

Centripetal bearings are divided into: deep groove ball bearings, centripetal thrus ball bearings, point (Angle) contact ball bearings, self-aligning ball bearings, cylindricalroller bearings, needle roller bearings, tapered roller bearings, self-aligning roller bearings  

Thrust bearings are divided into: thrust ball bearings, thrust angular contact ball bearings, thrust cylindrical roller bearings, thrust needle roller bearings, inferential tapered roller bearings, thrust self-alting ball bearings  

Linear bearings are divided into linear guide rails and ball screws  

Q7: What does bearing number mean?

A:This bearing code name is deep groove ball bearing,  

6 is a series of code, that is, represents the deep groove ball structure.  

0 is the thickness series code, 6202 is thicker than 6002, 6302 is thicker than 6202, thick here refers to the outer diameter and height.  

The last two numbers are the inner diameter code, 02 means the inner diameter of the bearing is 15,6202,6302, both of which are 15mm.  

Bearing suffix -RS stands for single side belt sealing ring, if it is -2RS stands for double side belt sealing ring.  6002-RS, there should be a “-”  

Q8: How to distinguish the types and codes of bearings?

A:Class 0: Deep groove ball bearings  6000 6200 6300 6700 6800 6900-N-ZZ-2RS  

Class 1: Aligning ball bearings self – aligning ball bearings  1200 1300 2200 2300  

Cylindrical roller bearings cylindrical roller bearings  NU000, N0000 NJ NN NNU  

Class 3: Self-aligning roller bearings  – 20000.  

Class 4: Needle roller bearings  -k, HK000, NK0000, NA0000  

Class 6: Angular contact ball bearings  – 7000C, 7000AC, and 7000B  

Class 7: Tapered roller bearings  – 30000 single column, 35,000 double column, and 38,000 four columns  

Thrust bearing Thrust bearings：  

Class 8: Thrust ball bearings  – 51000 unidirectional, 52000 bidirectional  

Class 9: Thrust roller bearings Thrust  

Thrust angular contact ball bearings — 560000 one-way and 234000 two-way  

Thrust cylindrical roller bearing -81000  

Thrust self-aligning roller bearing — 29000  

Thrust tapered roller bearing — 90000, etc  

Outer spherical bearing Plain bearing oil free bearing  

Q9: Is 70305 bearing the same as 30305 bearing?

A:One is angular contact ball bearing, one is tapered roller bearing!Said in front of a bearing types, 0 (double row angular contact ball bearings, 1 represents the self-aligning ball bearing, 2 for spherical roller bearings, 3 on behalf of the tapered roller bearings, four representative double row deep groove ball bearings, 5 representative thrust ball bearing, 6 on behalf of the bidirectional thrust ball bearing, 7 on behalf of the angular contact ball bearing, 8 representative thrust cylindrical roller bearing, N for circular gear edge cylindrical roller bearing,  NU stands for inner cylindrical roller bearing without retaining ring, NA stands for needle bearing.  

Q10: What is the meaning of motor bearing model 6200ZZ?

A：62 stands for single row deep groove ball bearing  

00 is an exploratory bearing, where the inner diameter is 10 and the outer diameter is 30  

ZZ indicates that dust covers are installed on both sides