DGBB allow the relative tilting angle error of the inner ring and outer ring. According to the radial clearance, the list is as follows:

 

Radial clearance	Allowable angle error
Basic class	8′
Class 3	12′
Class 4	16′

Equivalent dynamic load:

P=XFr＋YFa［kN］

Where

Fr: Radial load kN

Fa: Axial load kN

X and Y coefficients are shown in the table

 

Fa/Co	Clearance of basic class					Clearance of Class 3					Clearance of Class 4
	Fa/Fr≤e		Fa/Fr＞e		e	Fa/Fr≤e		Fa/Fr＞e		e	Fa/Fr≤e		Fa/Fr＞e		e
	X	Y	X	Y		X	Y	X	Y		X	Y	X	Y
0.025	1	0	0.56	2.0	0.22	1	0	0.46	1.74	0.31	1	0	0.44	1.42	0.39
0.04	1	0	0.56	1.8	0.24	1	0	0.46	1.61	0.33	1	0	0.44	1.36	0.41
0.07	1	0	0.56	1.6	0.27	1	0	0.46	1.46	0.36	1	0	0.44	1.27	0.44
0.13	1	0	0.56	1.4	0.31	1	0	0.46	1.30	0.41	1	0	0.44	1.17	0.46
0.25	1	0	0.56	1.2	0.37	1	0	0.46	1.14	0.47	1	0	0.44	1.05	0.53
0.5	1	0	0.56	1.0	0.44	1	0	0.46	1.00	0.54	1	0	0.44	1.00	0.56

 

Equivalent static load:

P0＝Fr［kN］ Fa/Fr≤0.8

P0＝0.6Fr+0.5Fa［kN］ Fa/Fr＞0.8

The suffixes used for deep groove ball bearings have the following meanings:
CN common group radial clearance: usually used only in combination with the following letters to indicate a narrow or offset clearance range
H The narrowed clearance range is equivalent to the upper part of the original clearance range.
M The narrowed clearance range is equivalent to the middle part of the original clearance range.
L The narrowed clearance range is equivalent to the lower part of the original clearance range.
The clearance range of P offset is equivalent to the composition of the upper part of the original clearance range and the lower part of the next group of clearance ranges.
The above letters are also applicable to the following clearance groups combined into corresponding meanings: C2, C3, C4 and C5, such as C2H
C2 radial clearance is less than the normal group
C3 radial clearance is greater than that of normal group
C4 radial clearance is greater than C3
C5 radial clearance is greater than C4
DB Two single row deep groove ball bearings paired back-to-back
DF Two single row deep groove ball bearings paired face to face
DT Two single row deep groove ball bearings paired in series
E Internal design change, reinforced structure
J Steel plate pressing cage, and number difference shall be added in case of material change.
M Brass solid cage with steel ball guide. Different designs and materials are numbered after M, such as M2
MA brass solid cage, outer ring guide
MB brass solid cage, inner ring guide
MT33 lithium grease, NLGI consistency 3, temperature range - 30 to+120 ℃ (standard filling volume)
MT47 lithium grease, NLGI consistency 2, temperature range - 30 to+110 ℃ (standard filling volume)
N Outer ring with stop groove
NR outer ring with stop groove and stop ring
N1 outer ring has positioning groove at the side
P5 Dimension accuracy and rotation accuracy conform to ISO tolerance class 5
P6 Dimensional accuracy and rotation accuracy conform to ISO tolerance class 6
P52P5+C2 dimension accuracy and rotation accuracy conform to ISO tolerance class 5, and the clearance is 2 groups.
P62P6+C2 dimension accuracy and rotation accuracy conform to ISO tolerance class 6, and the clearance is 2 groups.
P63P6+C3 dimension accuracy and rotation accuracy conform to ISO tolerance class 6, and the clearance is 3 groups.
One side of RS bearing is provided with skeleton rubber seal ring (contact type).
2RS bearing with RS seal on both sides
RS1 bearing is equipped with skeleton rubber seal ring (contact type) on one side, and the seal ring material is vulcanized rubber
2RS1 bearing with RS1 seal on both sides
One side of RS2 bearing is provided with skeleton rubber seal ring (contact type), and the seal ring material is fluorinated rubber
2RS2 bearing with RS2 seal on both sides
One side of RZ bearing is provided with skeleton rubber seal ring (non-contact).
2RZ bearing with RZ seal on both sides
S0 ferrule is tempered at high temperature and its working temperature can reach 150 ℃
S1 ferrule is tempered at high temperature, and the working temperature can reach 200 ℃
TN1 cage is nylon cage
One side of Z bearing is provided with dust cover
2Z bearing with dust cover on both sides
The ZN Z+N dust cover is on the opposite side of the stop groove.
The ZNR Z+NR dust cover is on the opposite side of the stop groove and the stop ring.
ZNB Z+NB dust cover is on the same side of the stop groove.
The ZNBR Z+NR dust cover is on the same side of the stop groove and the stop ring.
Both sides of 2ZN 2Z+N bearing are equipped with dust cover, and the outer ring is provided with stop groove.
Both sides of 2ZNR 2Z+NR bearing are equipped with dust cover, and the outer ring is equipped with stop groove and stop ring.
TH glass fiber reinforced phenolic resin cage (basket type).
V Fully loaded rolling element (without holder)