How to distinguish bearings by model number? （2）

The previous article mainly talked about the classification of bearings by model and the meaning of the prefix code of the model. This article mainly explains the meaning of the post-code, including retention and materials, tolerance levels, clearances, and heat treatment methods.

A. Suffix code—cage and its materials

1. Physical cage

Model type	Mean	Model type	Mean
A	The cage is guided by the outer ring	B	The cage is guided by the inner ring.
F	Steel solid cage, rolling element guide	FA	Steel solid cage, outer ring guide
FAS	steel solid cage, outer ring guide, with lubrication groove	FB	Steel solid cage, inner ring guide
FBS	steel solid cage, inner ring guide, with lubrication groove	FH	Steel solid cage, carburized and quenched
H, H1	carburizing and quenching cage	FP	Steel solid window cage
FPA	steel solid window cage, outer ring guide	FPB	steel solid window cage, inner ring guide
FV, FV1	Steel solid window cage, aged and tempered	L	Light metal solid cage, rolling element guide
LA	solid cage made of light metal, guided by the outer ring	LAS	Light metal solid cage, outer ring guide, with lubrication groove
LB	Light metal solid cage, inner ring guide	LBS	Light metal solid cage, inner ring guide, with lubrication groove
LP	Light metal solid window cage	LPA	solid window cage made of light metal, guided by the outer ring
LPB	Light metal solid window cage, inner ring guide (thrust roller bearing is shaft guide)	M, M1	brass solid cage
MA	Brass solid cage, outer ring guide	MAS	brass solid cage, outer ring guide, with lubrication groove
MB	brass solid cage, inner ring guide (thrust spherical roller bearing is shaft ring guide)	MBS	brass solid cage, inner ring guide, with lubrication groove
MP	Brass solid straight pocket cage	MPA	Brass solid straight pocket and cage, outer ring guide
MPB	Brass solid straight pocket cage, inner ring guide	T	Phenolic laminated cloth pipe solid cage, rolling element guide
TA	Phenolic laminated cloth tube solid cage, outer ring guide	TB	Phenolic laminated cloth tube solid cage, inner ring guide
THB	phenolic laminated cloth tube pocket type cage, inner ring guide	TP	Phenolic layer grave cloth tube straight pocket cage
TPA	phenolic laminated cloth tube straight pocket cage, outer ring guide	TPB	phenolic laminated cloth tube straight pocket cage, inner ring guide
TN	Engineering plastic molded cage, rolling element guide, with additional numbers indicating different materials	TNH	Engineering plastic self-locking pocket cage
TV	solid cage of glass fiber reinforced polyamide, guided by steel balls	TVH	Glass fiber reinforced polyamide self-locking pocket-type solid cage, guided by steel balls
TVP	glass fiber reinforced polyamide window type solid cage, steel ball guided	TVP2	glass fiber reinforced polyamide solid cage, roller-guided
TVPB	glass fiber reinforced polyamide solid cage, inner ring guided (thrust roller bearing is shaft guided)	TVPB1	solid window cage in glass fiber reinforced polyamide, shaft guided (thrust roller bearing)

2. Stamping cage

J—— Steel plate stamped cage.

JN—— Deep groove ball bearing riveted cage.

Cage changes

The number added after the cage code, or inserted in the middle of the cage code, indicates that the cage structure has been changed. These numbers are only for transitional periods, for example, NU 1008M 1.

Suffix code—bearing without cage

V——Full complement rolling element bearing. Example: NU 207V.

VT - full complement rolling element bearing with isolation balls or rollers. Example: 51120VT.

B. Suffix code—Tolerance level (dimensional accuracy and rotational accuracy)

Dimensional accuracy	Mean	Dimensional accuracy	Mean
P0	The tolerance level complies with the level 0 specified by the international standard ISO. It is omitted in the code and does not indicate it.	P6	The tolerance level complies with level 6 specified by the international standard ISO.
P6X	Class 6 tapered roller bearings with tolerance levels in compliance with international standards ISO	P5	The tolerance level conforms to level 5 specified by the international standard ISO
P4	The tolerance level complies with level 4 specified by the international standard ISO	P2	The tolerance level complies with level 2 specified by the international standard ISO (excluding tapered roller bearings).
SP	Dimensional accuracy is equivalent to level 5, and rotational accuracy is equivalent to level 4 (double-row cylindrical roller bearings)	UP	Dimensional accuracy is equivalent to level 4, and rotational accuracy is higher than level 4 (double-row cylindrical roller bearings)
HG	The dimensional accuracy is equivalent to level 4, and the rotational accuracy is higher than level 4 and lower than level 2 (spindle bearing).

Suffix code—clearance

Clearance	Mean	Clearance	Mean
C1	The clearance complies with Group 1 specified in the standard and is less than Group 2	C2	The clearance complies with group 2 specified in the standard and is less than Group 0
C0	The clearance complies with the 0 groups specified in the standard. It is omitted in the code and is not indicated	C3	The clearance complies with group 3 specified in the standard and is greater than Group 0
C4	The clearance complies with the standard group 4, which is greater than Group 3	C5	The clearance complies with Group 5 specified in the standard, which is greater than Group 4

When the tolerance grade code and clearance code need to be expressed at the same time, the tolerance grade code (P0 level is not expressed) plus the clearance group number (0 group is not expressed) are combined to express it.

For example: P63=P6+C3, which means the bearing tolerance level is P6 and the radial clearance is 3 groups.

P52=P5+C2, indicating bearing tolerance level P5, radial clearance 2 groups.

In non-standard clearance, when special radial clearance and axial clearance are required, the relevant limit value should be expressed in μ m after the letter R (radial clearance) or A (axial clearance), and the number Use small dots to separate them.

Example: 6210.R10.20 - 6210 bearing, radial clearance 10 μ m to 20 μ m.

6212.A120.160——6212 bearing, axial clearance 120 μ m to 160 μ m.

C. Suffix code - bearings for testing noise

F3 - low noise bearing. Mainly refers to cylindrical roller bearings and deep groove ball bearings with an inner diameter d > 60mm. Example: 6213.F3.

G—— Low noise bearing. Mainly refers to deep groove ball bearings with inner diameter d ≤ 60mm. Example: 6207.G

D.Suffix code—heat treatment

S0——The bearing ring has undergone high-temperature tempering treatment, and the working temperature can reach 150 ℃.

S1——The bearing ring has been treated with high-temperature tempering, and the working temperature can reach 200 ℃.

S2——The bearing ring has been tempered at high temperature, and the working temperature can reach 250 ℃.

S3——The bearing ring has been treated with high-temperature tempering, and the working temperature can reach 300 ℃.

S4——The bearing ring has been treated with high-temperature tempering, and the working temperature can reach 350 ℃.

The bearing model contains a lot of information about the bearing. If you are interested in the bearing or want to buy high-quality bearings, please feel free to contact us. We can provide you with free technical guidance and suitable purchasing solutions.