Beaning Selection & Calculation
SF-1 Self-lubricating Bearings(SF-10,SF-11,SF-12,SF-13,SF-14,SF-15,SF-16,SF-17,SF-18,SF-19)
SF-2 Prelubricated Bearings(SF-20,SF-21,SF-22,SF-23)
SF-3 Bimetal Bearings(SF-30,SF-31,SF-32,SF-33,SF-34)
SF-4 Wrapped Bronze Bearings(SF-40,SF-41,SF-42)
SF-5 Solid-lubricant Bearings(SF-50,SF-51,SF-52,SF-53,SF-54,SF-58,SF-59)
SF-6 Ball Retainer Bearings(SF-60,SF-61,SF-62)
SF-7 Oil-retaining Bearings(SF-70,SF-71)
SF-8 Point-lubricating Bearings(SF-80)
Wrapped Bearings Installation
 
Products >> 

SF-20 Prelubricated bearings

Structure

1、  POM with lead 0.3-0.5mm

2、Porous bronze 0.2-0.3mm

3Steel backing

4、Copper plating 0.002m

Tech.Data
Max.Load
Static
250N/mm2
 
Friction Cofee.
0.05-0.25u
Dynamic
140N/mm2
Speed limit(Oil)
2.5m/s
Oscillating
60N/mm2
Thermal conductivity
2.03Kcal/M.br.C
PV limit
Dry
2.8N/mm2×m/s
Coeff.of linear expansion
51×10-6per℃
Oil
22N/mm2×m/s
Initial pre-lubrication at assembly required
Temp.limit
-40℃~+130℃

Application characteristics

1、  It is superior to those known marginal lubricating materials when lacking of lubrication oil.

2、Owing to its thick and hard surface of friction, it has the advantage of low wear.

3、  High mechanical strength,it can stand heavy dynamic and static load. It is used in high load capacities and low speed with rotational, oscillating or frequent stop-start motion.

4、  It can work long time without oil in the condition of boundary lubrcation,under oil or grease lubrication Interval, the work is longer.

5、  It is machinable for the thicker of POM.

6、  The bushes can be applied in auto chassis, forging machine, metallurgical, civil engineering, power station, strip rolling industries etc.

Provide standardized products:Cylindrical bushes P15、P18,thrust washers P17、P19, flat strip material P17.

  provide non-standardized products:Cylindrical bushes, flanged bushes,trrust washers,flat strip material,half bearing,wear plate,SF-20 with steel bush.



Unit:mm  
Recommended
OD.D
Wall Thickness t
Hole Dia. h
t1
t2
Bearing Length and Part Number
shaft Dia.
Housing Bore
10
15
20
25
30
40
50
60
10
-0.013 -0.028
12
+0.018
0
12
+0.065
+0.030
1.0
0
-0.030
4
0.5
0.3
1010
1015
1020
12
-0.016 -0.034
14
14
1210
1215
1220
14
16
16
1410
1415
1420
15
17
17
1510
1515
1520
1525
16
18
18
1610
1615
1620
1625
18
20
+0.021
0
20
1810
1815
1820
1825
20
-0.080
-0.041
23
23
1.5 0
-0.035
0.8
0.4
2010
2015
2020
2025
22
25
25
+0.075
6
2210
2215
2220
2225
24
27
27
+0.035
2410
2415
2420
2425
2430
25
28
28
2515
2520
2525
2530
26
30
30
2.0 0
-0.040
1.0
0.6
2615
2620
2625
2630
28
32
+0.025
0
32
2815
2820
2825
2830
2840
30
34
34
3015
3020
3025
3030
3040
32
-0.025
-0.090
36
36
+0.085
3215
3220
3225
3230
3240
35
39
39
+0.045
3520
3525
3530
3550
38
42
42
3820
3825
3830
3840
3850
40
44
44
8
4020
4025
4030
4040
4050
Other lengths to order


Unit:mm  
Recommended
OD.D
Wall Thickness t
Hole Dia.h
t1
t2
Bearing Length and Part Number
Shaft Dia.
Housing Bore
40
50
60
65
80
90
95
100
65
0
-0.046
70
+0.030
0
70
+0.100
+0.055
2.5-0.040
-0.085
8
1.2
0.8
6540
6560
70
75
75
7040
7050
7065
7085
75
80
80
9.5
1.4
0.8
7540
7560
7680
80
85
+0.035
0
85
+0.120
+0.070
-0.050
-0.115
8040
8060
8080
85
0
-0.054
90
90
8540
8560
8580
90
95
95
9040
9060
9080
9090
100
105
105
10050
10080
10095
105
110
110
10560
10580
10595
105100
110
115
115
11060
11080
11095
110100
120
125
+0.040
0
125
+0.170
+0.100
12060
12080
120100
125
0
-0.063
130
130
12560
12580
125100
130
135
135
13050
13060
13080
130100
140
145
145
14050
14060
14080
140100
150
155
155
15050
15060
15080
150100
160
165
165
16050
16060
16080
160100
170
175
175
17050
17060
17080
170100
180
185
+0.046
0
185
+0.210
+0.130
18050
18060
18080
180100
190
0
-0.072
195
195
19050
19060
19080
190100
200
205
205
20050
20060
20080
200100
220
225
225
22050
22060
22080
220100
240
245
245
24050
24060
24080
240100
250
255
+0.052
0
255
+0.260
+0.170
25050
25060
25080
250100
260
0
-0.081
265
265
26050
26060
26080
260100
280
285
285
28050
28060
28080
280100
300
305
305
30050
30060
30080
300100
Other lengths to order

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