What Are Our Concerns About Bearings（9）

Q1:What is the type of bearing with an inner diameter of 3 centimeters and an outer diameter of 7 centimeters?

A:Thrust ball bearing, new model 51406, old model 8406. The thickness is 28 millimeters.

Thrust ball bearing, new model 52406, old model 38406. The thickness is 52 millimeters.

Cylindrical roller bearing, new model NF1906Q1, old model1012906Q. The thickness is 14 millimeters.

Q2:What bearing size is 62/28?

A:62/28 is non-standard size, it is deep groove ball type 0bearing: – Inner diameter: 28 mm, outer diameter: 58 mm,thickness: 16 mm.

Q3:How does the bearing model calculation formula calculate?

A:Bearing system standard parts, standards have external dimensions of the standard. Inner diameter is regular: such as 6206, inner diameter 6*5=30mm, 6310, inner diameter 10*5=50mm. Outside diameter cannot be calculated, only table lookup. For example, 6206, 62mm outside diameter. 6310 outside diameter 110mm.

Q4:What is the material of bearing SD-3160 and how many performance parameters?

A:First, SD-3160 is the bearing seat model

It is FAG bearing seat model

The bearing model 230SM280-MA is suitable for it.

Q5:How many types of bearings are there?  What are the general bearing models now? 

• Class 0 – Deep groove ball bearings 604-699, 6000-6044, 6200-6240, 6300-6334, 6403-6418, 6800-6844, 69-6930, 16001-16032  

• Class 1 – Self-aligning ball bearings 1200-1222, 1300-1322, 2200-2222, 2300-2322  

• Class 2 – Cylindrical roller bearings N203-NF309, NJ203-NJ330, NJ2204-NJ2328, NU202-NU1408,NU2205-NU2338,NUP207-NN3060  

• Class 3 – Self-aligning roller bearings 21304-22226, 22228-22348, 22348-23072, 23120-2317223218-24152  

• Class 6 – Angular contact ball bearings 5200-5315,7000-7240,7244-7410  

• Class 7 – Tapered roller shafts 30202-32330,E30202-E32319,HR30202-HR32009,HR32010-HR33216  

• Class 8 – Thrust ball bearings 23917-29434,51100-51244,51304-51420  

• Class 9 – Thrust roller bearings AXK1024-AXK120155, 81102-89320ZW, 29322-29444 89448-91754  

• External spherical bearings UC201-UC313,UCF203-UCT206,UK205-UKP213  

• Needle roller bearing RNA4900-TA5520,SDM6Y-307641,TLA10  

Q6:What is the type of bearing with outer diameter 32mm and inner diameter 15mm?

A：The bearing with an inner diameter of 15 and an outer diameter of 32 is only one specification. 

The model is 6002 deep groove ball bearing 

Q7:What bearing is outer diameter 14 and inner diameter 8?

A:NMB L-1480ZZ miniature bearing price parameters  

Bearing name: NMB L-1480ZZ  

New model: L-1480ZZ  

Old model: L-1480ZZ  

Inner diameter d (mm) : 8  

Outside diameter D (mm)：14  

Thickness B (mm) : 4  

Brand model;  L-1480ZZ  

Brand: NMB  

Category: miniature bearings  

Q8:Tapered roller bearings with C, D,J,X what is the difference?

A:Not the same.  

• SKF bearing prefix code (prefix) and its meaning：  

GS — Thrust cylindrical roller, thrust needle roller bearing ring.  Example: GS81107- seat ring of thrust cylindrical roller bearing 81107.  

K — thrust roller and cage assembly.  Example: K81170.  

K- – Inch tapered roller bearings with inner ring (inner cone) or outer ring (cone ring) with roller and cage assembly in accordance with AFBMA standard series.  Example: K-09067 — inner cone of tapered roller bearing series 09000.L — Single inner or outer ring of separated bearing.  Example: INNER ring of cylindrical roller bearing NU207.  

• SKF bearing rear code (suffix) and its meaning： 

Single row angular contact ball bearings：  

ACD — Contact Angle is 25 degrees.  

B — Contact Angle is 40 degrees.  

CC — Contact Angle is 12 degrees.  

• Self-aligning roller bearing：  

CAC, ECAC, CA, ECA — these are designed for large size bearings with symmetrical rollers.  Both sides of the inner ring are provided with fixed guard edges, and the inner ring is blocked in the activity.  The cage is a solid brass or steel frame.  CAC and ECAC bearing roller and raceway surfaces are optimized to facilitate the roller and reduce friction.  ECAC type with stiffener roller for increased load capacity.  

-2F — External spherical ball bearing with dust rejection rings on both sides.  

External spherical ball bearing with combined dust rejection rings on both sides.  

G — Universal matching single row angular contact ball bearings.  When the bearings are arranged face to face or back to back, there is a certain pre-load before installation.

GA — Face to face, back to back arrangement, there is a lighter preload in the bearing.  

GB — Face to face, back to back arrangement, bearing with medium preload.  

GC — Face to face, back to back arrangement, there is a heavy preload in the bearing.  

K — Conical hole, taper 1:12.  

K30 — Conical hole, taper 1:30.  

• FAG bearing prefix code (prefix) and its meaning  

R is placed directly before the bearing basic code number, and the other front codes are separated from the basic code by small dots.  

GS — Thrust cylindrical roller bearing ring.  Example: GS. 81112  

K — combination of rolling body and cage.  Example: thrust cylindrical roller and cage assembly K.81108.  

FAG bearing rear code (suffix) and its meaning  

F- Steel solid cage, rolling body.  

Fa-steel solid cage, outer ring.  

FAS- steel solid cage, outer ring, with lubrication groove.  

FB- Steel solid cage, inner ring.  

FBS- Steel solid cage, inner ring, with lubrication groove.  

FH- Steel solid cage, carburized and hardened.  

H,H1- Carburizing and quenching retainer.  

P5- Tolerance class in accordance with the international standard ISO level 5.  

P4- Tolerance class in accordance with the international standard ISO level 4.  

P2- Tolerance classes ISO Grade 2 (excluding tapered roller bearings)  

• NSK bearing pre-code meaning  

F — Deep groove ball bearings with flange outer ring (for d less than 10 mm), example :F605.  

HR — Tapered roller bearing with high load, example: HR30207J.  

Meaning of NSK bearing postposition code  

A — Bearing with internal design different from standard.  

A — Angular contact ball bearing, contact Angle is 30 degrees.  

A5 — Angular contact ball bearing, contact Angle 25 degrees  

Z, ZS — One side with steel dust cover.  

ZZ, ZZS — Dust cover with steel plate on both sides.  

D, DU — with contact rubber seal on one side.  

C1 — Radial clearance of centripetal bearing, smaller than C2 clearance.  

C2 — Radial clearance of centripetal bearing, smaller than the standard clearance.  

CN (omitted) — Radial standard clearance for radial bearings.  

C3 — Radial clearance of centripetal bearing, larger than standard clearance.  

C4 — Radial clearance of centripetal bearing, larger than C3 clearance.  

• NTN bearing suffix meaning  

B — 40° contact Angle;  A — 25° contact Angle;  C — 15° contact Angle;  J — Pressing steel cage;  LI — Machine cutting copper alloy cage;  DB – Back-to-back configuration;  DF — face to face configuration;  CS — Radial clearance is greater than standard clearance.  

• TIMKEN bearing suffix meaning  

AB outer ring with flange outer ring, not interchangeable with the basic model  

AC inner ring with different inner diameter and rounded outer diameter, different inner geometry  

Outer ring outside diameter/width/or fillet radius different from base model  

AD outer ring Dual outer rings are not interchangeable with the basic model  

CR Series of bearings with flanges in inner/outer raceway CX inner ring size is different from the basic model and is not interchangeable  

D Inner/outer ring Double inner or double outer ring, not interchangeable with the basic model  

• INA bearing suffix meaning  

P- bearing side with sealing ring  

PP- bearing with sealing rings on both sides  

Rs-bearing with sealing ring on one side  

2RS- Bearing with sealing rings on both sides  

P6- Bearings with higher dimensional tolerances and geometric accuracy requirements  

P5- Bearings with high dimensional tolerance and geometric accuracy requirements  

P4- Bearings with extremely high dimensional tolerances and geometric accuracy  

• KOYO bearing precode meaning  

4CRI- four row cylindrical roller bearing inner ring, example: 4CRI4560F  

4CRO- outer ring of four row cylindrical roller bearing, example: 4CRO660AF  

E-magneto ball bearing with positive tolerance outside diameter, example: E10  

EN- magneto ball bearing with negative tolerance outside diameter, example: EN10  

• KOYO bearing suffix meaning  

A-angular contact bearing, contact Angle 30 degrees (not marked), example: 7210  

B- Angular contact bearing, contact Angle 40 degrees, example: 7210B  

C- angular contact bearing, contact Angle 15 degrees, example: 7210C  

Rsc-silicone rubber RS seal, example: 6210RSC  

RS type seal made of rsd-polypropylene rubber, example: 6210RSD  

RSE- single side, flange contact type synthetic rubber seal, example: 6206RSE  

K- bearing with taper hole, taper of 1:12, example: 1210K

K30- bearing with taper hole, taper of 1:30, example: 23026K30  

N-ring bearing with stop groove, example: 6206N  

C- Tapered roller bearings with lock holes  

NR- bearing with stop ring on outer ring, example: 6210NR  

Y- Non-standard chamfering less than the standard chamfering size, for example, 30206Y  

S-tapered roller bearings, Non-standard Chamfering (Bevel Chamfering)  

SG- Tapered roller bearings with spiral grooves in inner diameter  

Q9:How to determine the number of lines of the rolling body according to the bearing type.?

A：Generally speaking, the number of rolling column of bearing is not the same as the model, but the definition standard of bearing code does not specify the number of rolling column of bearing separately, but specifies the structure type of bearing.   So if you are familiar with the structure and bearing type of bearings, you can usually know the number of rolling body columns.  

Q10:Is the domestic standard of 6000 deep groove ball bearing consistent with international standard?  

Which standard does foreign-made 6000 bearings implement?  

A:The installation size standard is the same, and the installation use has no impact, but the internal design is different  

The main foreign is to choose a specific bearing on a specific occasion, not to use a set of bearings,  

Select accurate bearings, such as clearance, tolerance, grease and so on.