Technical Information
1. BEARING MATERIALS:
Ring and Rolling Element s material: Primarily, high carbon chromium bearing steel is used for the bearing rings and rolling elements. This bearing steel is heat treated by Vacuum quench.The general feature of the steels is highly purified, high hardness, anti-fatigue, anti-grinded,and the stability of the dimension.
The standard material for ZL bearing rings, rollers and balls is vacuum-processed high carbon chromium steel allowing high quality consitency and long bearing service life. Material symbol is GCr15, which from Baogang Steel and Xingcheng Steel and its chemical composition is approximately the same as AISI 52100 specified in the USA, DIN 100 Cr6 in Germany, and BS 535A99 in England.
Cage material: The low carbon steels are mainly used for pressed cages of bearings. Depending on the purpose, brass, stainless steel or synthetic resin may be used. For machined cages, high-strength brass or carbon steel is used.
CHEMICAL COMPOSITION OF BEARING STEEL
|
Steel No. |
Symbol |
Chemical Composition (Wt%) |
|
Gcr15 |
AISI 52100 |
C
0.95-1.05 |
Cr
1.30-1.65 |
Si
0.15-0.35 |
Mn
0.2-0.4 |
P
<0.027 |
S
<0.02 |
THE COMPARISON TABLE FOR EACH STANDARD
|
China |
ISO |
USA |
Japan |
Germany |
France |
Sweden |
|
GB |
|
AISI |
JIS |
DIN |
NF |
|
|
Gcr15 |
683/xv11 |
52100 |
SUJ2 |
100Cr6 |
100C6 |
SKF3 |
一、TAPERED ROLLER BEARING
(1)The rings and rollers of ZL bearings are made of refined high carbon-chrome bearing steel-GCr15. (The contrast of Bearing Steel No. of each country) The cages are punch-pressed from super quality cold rolling steel sheet or having nylon cages. The seals are hot-pressed from oil-resistant bune-N rubber with phosphatizing steel skeleton. (2)Case hardened steel, pls kindly contact us for more information.
PRECISION
The precision of inch system bearing is classified in 4, 3, 2, 0 and 00 five grades Classes. 0,6/6X,5 and 4 apply to metric-system bearings.
The relationship of classes to ISO tolerance classes, etc.
|
Series |
Standard |
Bearing Class Designations |
|
Inch |
ANSI/ABMA std.19.2 |
4 |
2 |
3 |
0 |
00 |
|
Metric |
GB/T307.1 |
0 |
6X |
5 |
4 |
2 |
|
ISO492 |
0 |
6X |
5 |
4 |
2 |
|
ANSI/ABMA std.19.1 |
K |
N |
C |
B |
A |
|
DIN 620 |
0 |
6X |
5 |
4 |
2 |
|
JISB1514 |
0 |
6X |
5 |
4 |
2 |
CLEARANCE
The radial clearances of tapered bearings are divided into six groups as shown.
|
Bore diameter (mm) |
Group 1 |
Group 2 |
Normal |
Group 3 |
Group 4 |
Group 5 |
|
Over |
to |
min |
max |
min |
max |
min |
max |
min |
max |
min |
max |
min |
max |
|
- |
30 |
0 |
10 |
10 |
20 |
20 |
30 |
40 |
50 |
50 |
60 |
70 |
80 |
|
30 |
40 |
0 |
12 |
12 |
25 |
25 |
40 |
45 |
60 |
60 |
75 |
80 |
95 |
|
40 |
50 |
0 |
15 |
15 |
30 |
30 |
45 |
50 |
65 |
65 |
80 |
90 |
110 |
|
50 |
65 |
0 |
15 |
15 |
30 |
30 |
50 |
50 |
70 |
70 |
90 |
90 |
120 |
|
65 |
80 |
0 |
20 |
20 |
40 |
40 |
60 |
60 |
80 |
80 |
110 |
110 |
150 |
|
80 |
100 |
0 |
20 |
20 |
45 |
45 |
70 |
70 |
100 |
100 |
130 |
130 |
170 |
Special radial clearance or axial clearance requirement could be made as specified in orders.
LUBRICATION
The main purposes of bearing lubrication are to prevent metallic contact between the rolling elements, raceways, and cage, and also to prevent the bearing from corrosion and wear. Additional functions are sealing and cooling of the bearing.
Bearing may be lubricated with grease or oil-in special cases with a solid lubricant-the choice of which depends primarily on the temperature range, operating speeds, and loading conditions of the bearings concerned.
All lubricants must be changed from time to time because their properties deteriorate as a result of aging and contamination of the lubricants.
The limiting speeds for both grease and oil lubrication are given
|
Title |
No. |
Average Drops |
Working 25(77oF) |
Working T. |
Remarks |
|
1. Shell |
|
Alvania R Grease |
R2 |
185(365) |
265-295 |
-30~120 |
Lithium Grease |
|
R3 |
185(365) |
220-250 |
-30~120 |
|
Alvania EP Grease |
EP1 |
180(356) |
310-340 |
|
Lithium EP Grease |
|
EP2 |
185(365) |
265-295 |
-25~110 |
|
2. Mobil oil |
|
Mobil Grease |
22 |
192?378? |
274 |
-40~120 |
|
|
EP2 |
190(374) |
280 |
-25~110 |
|
3. Esso |
|
Andok |
C |
260(500) |
190-210 |
-30~150 |
|
|
Beacon |
325 |
190(374) |
280 |
-55~120 |
|
二、BALL BEARING
CAGES
In general, ZL cages are pressed steel ribbon cages & pressed steel snap cages. For wheel hub bearings and A/C beairngs, the cages are made from Nylon 66 with glass fiber.
SHIELDS & SEALS
The standard seals are made of oil and wear-resistant nitrile rubber(NBR) with a sheet steel reinforcement. SPCC is the standard material for shields we apply.
LUBRICATION
The grease can be applied upon customer's requirements. In general, Alvania R 2 is used for FKG small ball bearing. RONEX MP from ESSO Co. and ALVANIA R3 from SHELL are used for wheel hub bearings.
Details as per our grease conversion table
2. BEARING TOLERANCE & ACCURACY
Bearing accuracy consists of dimensional accuracy and running accuracy. The normal grade is P0,a higher grade is P6 and P2 is the highest grade.
Accuracy Grade Standard Conversion Table
|
Country |
Standard |
Tolerance Grade |
|
China |
GB/GB307.1 |
0 |
6 |
5 |
4 |
|
American |
ANSI |
ABEC-1 |
ABEC-3 |
ABEC-5 |
ABEC-7 |
|
|
ISO |
0 |
6 |
5 |
4 |
|
Germany |
DIN |
P0 |
P6 |
P5 |
P4 |
|
Japan |
JIS |
P0 |
P6 |
P5 |
P4 |
3. INTERNAL CLEARANCE
The radial internal clearance of a bearing is of considerable importance, if satisfactory operation is to be obtained, as it greatly influences beairng performance including fatige life, vibration, noise, heat generation, etc.
The radial clearances of ZL bearings can be classified into C2, Standard, C3, C4 & C5
RADIAL CLEARANCE TABLE (μm)
|
Bore Diameter |
C2 |
Standard |
C3 |
C4 |
C5 |
|
over |
incl |
min |
max |
min |
max |
min |
max |
min |
max |
min |
max |
|
10 |
18 |
0 |
9 |
3 |
18 |
11 |
25 |
18 |
33 |
25 |
45 |
|
18 |
24 |
0 |
10 |
5 |
20 |
13 |
28 |
20 |
36 |
28 |
48 |
|
24 |
30 |
1 |
11 |
5 |
20 |
13 |
28 |
23 |
41 |
30 |
53 |
|
30 |
40 |
1 |
11 |
6 |
20 |
15 |
33 |
28 |
46 |
40 |
64 |
|
40 |
50 |
1 |
11 |
6 |
23 |
18 |
36 |
30 |
51 |
46 |
76 |
NOTE
1. Standard clearance is C0.
2. C2 Group clearance only for bearings over ABEC-3 accurancy.
4. VIBRATION AND NOISE
The vibration and noise of bearings are classified in four classes Z1, Z2, Z3, and Z4. It is measured by the instrument of S0910-1. For special requirement, it is measured by BVT-1 and classified as V1, V2, V3 , and V4.
The data are shown in the following tables, different vibration and noise requirement should be mentioned in order.
MAXIMUM VIBRATION ACCELERATION OF SINGLE BEARING(Tolerance in dB)
The Grease No and Function(Table 7)
| Manufacturer |
Brand |
Drop point ℃ |
Consistency |
Operating Tem range ℃ |
Selection Criteria |
NMB |
| Code |
| Shell |
Alvania R2 |
185 |
265-295 |
-35～+120 |
general purpose |
|
| Darina 2 |
250 |
265-295 |
-25～+150 |
general purpose |
|
| Chevron |
SRI-2 |
240 |
255-280 |
-30～+120 |
water resistant |
|
| Mobil |
Mobilux 2 |
190 |
265-290 |
-10～+110 |
genreal purpose |
|
| Mobil 22 |
192 |
250-274 |
-40～+120 |
general purpose |
|
| Mobil 28 |
260 |
265-295 |
-55～+175 |
wide range Temperature |
|
| Mobil 48 |
260 |
240-270 |
-60～+170 |
high temperature grease |
|
| Esso |
Beacon 325 |
193 |
290 |
-60～+120 |
low-temperature grease |
LG20 |
| Polyrex EM |
260 |
288 |
-40～+180 |
high temperature low noise |
|
| Andok B |
260 |
280 |
-40～+120 |
normal temperature grease |
LG38 |
| Andok 260 |
200 |
250 |
-30～+150 |
normal temperature grease |
LG71 |
| Arapen RB300 |
200 |
250 |
-30～+100 |
normal temperature grease |
|
| UNIREX N2 |
250 |
280 |
-40～+180 |
high temperature low noise |
|
| Polyrex EP2 |
280 |
280 |
-40～+180 |
high temperature low noise |
|
| UNIREX N3 |
250 |
235 |
-40～+180 |
high temperature low noise |
|
| Kyodo Yushi |
Multemp PS2 |
189 |
280 |
-50～+110 |
low-temperature grease |
LY72 |
| Multemp SRL |
191 |
245 |
-40～+150 |
low noise grease |
LY121 |
| Multemp SC-A |
≥260 |
280 |
0～+160 |
normal temperature grease |
|
| Multemp ET150 |
≥260 |
280 |
-10～+160 |
normal temperature grease |
|
| Oneluba |
198 |
270 |
-10～+110 |
normal temperature grease |
|
| Adrex |
198 |
300 |
-10～+120 |
normal temperature grease |
|
| Parmax |
180 |
300 |
-10～+120 |
normal temperature grease |
|
| Emalube 1130 |
≥260 |
300 |
-10～+130 |
normal temperature grease |
|
| Unilube DL1 |
185 |
332 |
-10～+110 |
normal temperature grease |
|
| Alumix HD1 |
247 |
335 |
0～+120 |
normal temperature grease |
|
| Multemp LTS |
250 |
201 |
-60～+130 |
low-temperature grease |
|
| Multemp SRH |
250 |
201 |
-40～+150 |
low-temperature grease |
|
| Multemp SB-M |
220 |
260 |
-40～+200 |
high temperature high speed grease |
|
| Multemp SC-C |
280 |
300 |
-40～+200 |
high temperature pump-water grease |
|
| ET-K |
260 |
300 |
-40～+200 |
high temperture high speed alternators grease |
|
| Kluber |
Staburage NBU12 |
220 |
270 |
-35～+150 |
normal temperature grease |
|
| I Sofled NBU15 |
220 |
280 |
-30～+130 |
normal temperature grease |
|
| Asonic GLY32 |
190 |
265-295 |
-50～+140 |
low-temperature grease |
|
| Asonic GHY72 |
250 |
250-280 |
-40～+180 |
high temperature low noise |
|
| Isoflex SuperLds18 |
190 |
280 |
-60～+130 |
low-temperature grease |
LY218 |
| Isoflex Super TEL |
|
|
-65～+70 |
low-temperature grease |
|
|
Isoflex LDS18 Special A |
190 |
280 |
-60～+130 |
low-temperature grease |
|
| Isoflex PDB38 CX100 |
|
|
-70～+120 |
low-temperature grease |
|
| Barrierta IMI/V |
|
280 |
-50～+220 |
high-low temperature grease |
|
| Isoflex Topas NB52 |
204 |
280 |
-60～+170 |
high-low temperature grease |
|
| Barrierta L55/2 |
|
280 |
-35～+260 |
high-low temperature grease |
|
|
Barrierta EL |
|
280 |
-50～+180 |
high-low temperature grease |
|
| Asonic HQ72-102 |
240 |
250-280 |
-40～+180 |
high-low temperature and low noise grease |
|
| Barrierta TK44N2 |
|
|
-60～+230 |
high-low temperature grease |
|
| Isoflex NCA15 |
180 |
265-295 |
-40～+130 |
high speed grease |
|
| Petamo GHY443 |
250 |
250-280 |
-20～+180 |
high temperature longevity grease |
|
| Petamo GHY133 |
240 |
250-280 |
-25～+150 |
normal temperature grease |
|
| China Hangu |
Hangu 2 |
198 |
265-295 |
-10～+130 |
low noise serive |
|
| Dow Corning |
Molykote 33M |
210 |
260 |
-70～+180 |
high-low temperature grease |
LY81 |
| Molykote 44M |
204 |
260 |
-40～+200 |
high temperature grease |
LY13 |
| Molykote 55M |
|
|
-55～+165 |
low-temperature grease |
LY52 |
|
