Oiles 81
Oil-impregnated polyolefin bearings
Feature
󱛠
Serviceable without the need for lubrication.
󱛠
Features low coecient of friction and superior impact resistance performance.
󱛠
Demonstrates superior wear resistance in abrasive conditions due to foreign
matter, coarse surfaces of mating parts, rust, etc.
󱛠
Injection-molded and can be made in complicated shapes. Has good mass
productivity.
Specific gravity
Tensile strength
Tensile elongation at break
Flexural property
Flexural modulus
Hardness
Izod impact strength (with notch)
Co-efficient of linear expansion
Deflection temperature under load 0.45 MPa
Melting point
UL incombustibility
ASTM D 792
ASTM D 638
ASTM D 638
ASTM D 790
ASTM D 790
ASTM D 785
ASTM D 256
ASTM D 696
ASTM D 648
DSC
UL94
Mechanical properties 81-12 81-20
Compressive stress
1% deformation
10% deformation
1.00
26.5｛270｝
200
22.5｛230｝
980｛10,000｝
35
147｛15.0｝
11∼13
̶
137
̶
0.97
32.4｛330｝
10
33.3｛340｝
1,550｛15,800｝
60
98.1｛10.0｝
11∼13
85
130
（Note）
HB
8.3｛85｝
26.5｛270｝
10.8｛110｝
26.5｛270｝
ASTM D 695
※
The values shown above are typical values, not the standard values.
（
Note
）
values by vicat softening point (ASTM D 1525)
Service range
Lubrication condition
Service temperature range
℃
Allowable max. pressure
P
N/mm
2
｛
kgf/cm
2
｝
Allowable max. velocity
V
m/s
｛
m/min
｝
Allowable max.
PV
value
N/mm
2
・
m/s
｛
kgf/cm
2
・
m/min
｝
−60∼＋60
5.0｛51｝
0.25｛15｝
0.80｛489｝
−60���＋60
3.0｛31｝
0.50｛30｝
0.80｛489｝
Dry
81-12 81-20
̶
N/mm
2
｛kgf/cm
2
｝
％
N/mm
2
｛kgf/cm
2
｝
N/mm
2
｛kgf/cm
2
｝
N/mm
2
｛kgf/cm
2
｝
HRR
J/m｛kgfcm/cm｝
×10
−5
℃
−1
℃
℃
File No.E78113
93
Selection Guide
Product
Information
Plastic Bearing
Multi-layer Bearing
Metallic Bearing
Air Bearings
Technical
Information
Slide Shifter
Corporate Pro le
066-139_樹脂系ベアリング.indd 93 19/11/13 11:08
81-20 Test data
W
W
Journal bearing rotation test
＜Testing condtions＞
Bearing dimension ： φ3 5×φ38×R20
Mating material ： SUS303
（surface roughness Rz1.6μm）
Pressure ： 0.316N/mm
2
｛3.0kgf/cm
2
｝
Velocity ： 0.130m/s｛7.8m/min｝（120rpm）
Test time ： 200hrs.
Journal rotation test
＜Testing conditions＞
Mating material ： SUS303
（surface roughness Rz1.6μm）
Pressure ： 1.96N/mm
2
｛20.0kgf/cm
2
｝
Velocity ： 0.047m/s｛2.8m/min｝（90rpm）
Test time ： 250hrs.
0.20
0.15
0.10
0.05
0
400 80 120 160 200
Coefficient of friction〔μ〕
Test time〔hrs.〕
Oiles 81-20（No oiling）
Oiles 81-20（Initial greasing）
0 5 10 15 20 25 30
0.40
0.30
0.20
0.10
0
0 50 100 150 200 250
Coefficient of friction〔μ〕
Polyacetal
Oiles 81-20
Wear amount〔μm〕
Test time〔hrs.〕
Polyacetal type
Oiles 81-20
94
Selection Guide
Product
Information
Plastic Bearing
Multi-layer Bearing
Metallic Bearing
Air Bearings
Technical
Information
Slide Shifter
Corporate Pro le
066-139_樹脂系ベアリング.indd 94 19/11/13 11:08