China Four Point Angular Contact Ball Bearing produced by KOMEL is a pure axial load bearing. It can withstand bidirectional axial loads through the four-point contact design between the steel ball and the inner and outer rings (the contact angle is usually 35° or 40°), but the radial load capacity is low. It is suitable for scenarios where bidirectional axial positioning and small radial loads are required (such as crane arms and rotary workbenches).
Structural features
Single-row ball bearings, both inner and outer rings have double ribs, and the steel ball and raceway form four-point contact.
The contact angle is fixed, usually 35° (QJ series) or 40° (Q series).
Load capacity
The bidirectional axial load capacity is strong, about twice that of the same size single-row angular contact bearing.
The radial load must be ≤ 30% of the axial load, otherwise the life will be greatly reduced.
Rigidity and precision
The axial rigidity is high, suitable for high-precision axial positioning.
A certain angular deviation is allowed (usually ≤ 2 arc minutes).
|
Model Number |
Inner Diameter |
Outer Diameter |
Width |
|
QJ 203 |
17 |
40 |
12 |
|
QJ 304 |
20 |
52 |
15 |
|
QJ 206 |
30 |
62 |
16 |
|
QJ 306 |
30 |
72 |
19 |
|
QJ 207 |
35 |
72 |
17 |
|
QJ 307 |
35 |
80 |
21 |
|
QJ 208 |
40 |
80 |
18 |
|
QJ 308 |
40 |
90 |
23 |
|
QJ 209 |
45 |
85 |
19 |
|
QJ 309 |
45 |
100 |
25 |
|
QJ 210 |
50 |
90 |
20 |
|
QJ 310 |
50 |
110 |
27 |
|
QJ 211 |
55 |
100 |
21 |
|
QJ 311 |
55 |
120 |
29 |
|
QJ 212 |
60 |
110 |
22 |
|
QJ 312 |
60 |
130 |
31 |
|
QJ 213 |
65 |
120 |
23 |
|
QJ 313 |
65 |
140 |
33 |
|
QJ 214 |
70 |
125 |
24 |
|
QJ 314 |
70 |
150 |
35 |
|
QJ 215 |
75 |
130 |
25 |
|
QJ 315 |
75 |
160 |
37 |
|
QJ 216 |
80 |
140 |
26 |
|
QJ 316 |
80 |
170 |
39 |
|
QJ 217 |
85 |
150 |
28 |
|
QJ 317 |
85 |
180 |
41 |
|
QJ 218 |
90 |
160 |
30 |
|
QJ 318 |
90 |
190 |
43 |
|
QJ 219 |
95 |
170 |
32 |
|
QJ 319 |
95 |
200 |
45 |
|
QJ 220 |
100 |
180 |
34 |
|
QJ 320 |
100 |
215 |
47 |
|
QJ 222 |
110 |
200 |
38 |
|
QJ 322 |
110 |
240 |
50 |
|
QJ 224 |
120 |
215 |
40 |
|
QJ 324 |
120 |
260 |
55 |
|
QJ 226 |
130 |
230 |
40 |
|
QJ 326 |
130 |
280 |
58 |
|
QJ 228 |
140 |
250 |
42 |
|
QJ 328 |
140 |
300 |
62 |
|
QJ 1030 |
150 |
225 |
35 |
|
QJ 230 |
150 |
270 |
45 |
|
QJ 330 |
150 |
320 |
65 |
|
QJ 232 |
160 |
290 |
48 |
|
QJ 332 |
160 |
340 |
68 |
|
QJ 234 |
170 |
310 |
52 |
|
QJ 334 |
170 |
360 |
72 |
|
QJ 236 |
180 |
320 |
52 |
|
QJ 336 |
180 |
380 |
75 |
|
QJ 1038 |
190 |
290 |
46 |
|
QJ 238 |
190 |
340 |
55 |
|
QJ 338 |
190 |
400 |
78 |
|
QJ 240 |
200 |
360 |
58 |
|
QJ 1244 |
220 |
400 |
78 |
|
QJ 344 |
220 |
460 |
88 |
|
QJ 1248 |
240 |
440 |
85 |
|
QJ 248 |
240 |
440 |
72 |
|
QJ 1252 |
260 |
480 |
90 |
|
QJ 1256 |
280 |
500 |
90 |
|
QJ 1260 |
300 |
540 |
98 |
|
QJ 1064 |
320 |
480 |
74 |
|
QJ 1264 |
320 |
580 |
105 |
|
QJ 1272 |
360 |
650 |
122 |
|
QJ 1080 |
400 |
600 |
90 |
|
QJ 1084 |
420 |
620 |
90 |
|
QJ 1088 |
440 |
650 |
94 |
|
QJ 1096 |
480 |
700 |
100 |
1. Structural and contact angle suffixes
Suffix Meaning Applicable manufacturers Description
QJ Four-point contact design (split inner ring) NSK, SKF The contact angle is usually 35°(45°for QJ12 type)
Q Four-point contact design (split outer ring) NSK The contact angle is usually 23°(45°for Q12 type)
2. Cage material suffixes
Suffix Material Applicable manufacturers Description
MPA Window-type brass solid cage (outer ring guide) FAG, SKF Common in QJ type bearings
MPB Window-type brass solid cage (inner ring guide) NSK Q type bearing special
TVP Glass fiber reinforced polyamide cage FAG Steel ball guide, suitable for high speed
FA Machined steel cage (outer ring guide) SKF Wear-resistant, suitable for heavy loads
PHA Polyether ketone (PEEK) cage SKF High temperature and corrosion resistance
3. Axial clearance suffixes
Suffix Clearance grade Applicable manufacturers Description
C2 Axial clearance is less than the ordinary group SKF Applicable to high-precision positioning
C3 Axial clearance is greater than the ordinary group SKF Allows greater thermal expansion
C4 Axial clearance is greater than C3 group SKF Used under special working conditions
CNL The lower half of the ordinary group clearance SKF Preload control
4. Accuracy grade suffix
Suffix Accuracy grade Applicable manufacturers Description
P6 ISO 6 grade (dimensional and rotational accuracy) SKF Ordinary precision equipment
P5 ISO 5 grade (high precision) General Precision scenes such as machine tool spindles
SP Super precision grade NSK Dimensional stability under extreme working conditions
5. Special design suffixes
Suffix Meaning Applicable manufacturers Description
N2 Outer ring with two 180°positioning grooves SKF, FAG Convenient for axial fixation
S1 Special heat treatment (stable below 200℃) SKF Special for high temperature environment
B20 Narrowed width tolerance SKF Compact installation design
6. Sealing and lubrication suffixes
Suffix Meaning Applicable manufacturers Description
2RS Double-sided rubber seal Universal Anti-liquid intrusion
2Z Double-sided iron cover dustproof Universal Dustproof design
HT51 High temperature grease (-30~+175℃) SKF Special lubrication requirements
Typical application scenarios
Engineering machinery: crane arm support, turntable bearing.
Industrial equipment: centrifuge, vibrating screen.
Precision machinery: optical instrument rotating table, robot joint.
Vehicle industry: railway locomotive axle, wheel hub bearing.
Address
Yaohai industrial park, Xinzhan high tech district,Hefei, China
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