Configurations
801 Series – Composite outer race and metallic ball
821 Series – Composite ball and metallic loader slot outer race
831 Series – Composite ball and split metallic outer race for static misalignment applications
838 Series – OD Lined composite ball and split metallic outer race for dynamic misalignment applications
Consult with Rexnord engineers for the optimum annular bearing configuration for your application
Bearing Construction
The composite component of the bearing consists of a self-lubricating woven Teflon® fiber and polyester liner supported by a filament wound continuous fiberglass fiber and epoxy resin matrix. The metallic bearing component can be made from a variety of materials.
Size range
Standard and special inch and metric sizes are available from 1/4” to 6” inside diameter.
Load Capacity
Typical dynamic loads:
4,000 to 20,000 psi
Ultimate strength:
Due to the variety of annular bearing configurations, consult with Rexnord engineers for the ultimate strength of the bearing.
Motion
The bearings work well in oscillatory, pivot, and slow speed full rotation. Consult Rexnord engineers if linear sliding of the shaft is required.
Friction
Duralon® bearings offer low-friction operation. Friction decreases with increasing load. Friction coefficients vary from .16 @500 psi to .07 @ 20,000 psi.
Self-lubricated
The bearing operates self-lubricated by Teflon® transfer to the shaft surface caused by relative movement between the shaft and bearing liner under load. Lubrication can be used if desired. Consult a Rexnord engineer for approved lubricants.
Electrical Properties
The Duralon® composite component back-up material is an electrical insulator. Its dielectric strength is about 300 volts per mil. Since the back-up material is electrically non-conducting, electrolytic or galvanic action will not take place.
Chemical Properties
Duralon® bearings are typically resistant to most chemicals. Due to the wide range of exposures, specific conditions must be checked. Consult a Duralon engineer for specific chemicals. |
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Mechanical Properties(1) |
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Modulus
(PSI) |
Ultimate Strength
(PSI) |
| Axial Compression |
.8 x 106 |
20,000 |
| Hoop tension |
2.7 x 106 |
35,000 |
| Bending |
1.5 x 106 |
25,000 |
| Torsion
(45° helix angle) |
1.5 x 106 |
27,000 |
| Interlaminar shear |
---- |
3,000 – 5,000 |
| (1) Mechanical properties of the filament wound back-up material are derived from the modulus of elasticity of the individual materials, and the construction. The values shown have been developed using standard tests for cylindrical shapes. |
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Other Mechanical Properties(2) |
| Impact resistance (notch) |
.41 ft-lb/in |
| Specific gravity |
1.9 |
| Spring rate |
3.467 x 106 lb / in |
| Ultimate strength |
77,000 psi |
| (2) Values applicable for temperatures ranging from -65 °F to + 250 °F. Values shown are for .125” wall thickness. Consult a Rexnord engineer for other wall thicknesses. |
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Temperature Ranges |
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Continuous |
Intermittent |
| |
Min °F |
Max °F |
Max °F |
| Standard
Resin |
-65°(3) |
325° |
400° |
| High
Temperature
resin |
-65°(3) |
400° |
450° |
| (3) Duralon® bearings can be used in cryogenic applications. Consult a Rexnord engineer. |
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Thermal Properties(4) |
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Duralon® |
Aluminum |
Steel |
Expansion (in/in/°F)
Axial direction
Hoop direction |
15.0 x 10-6
7.0 x 10-6 |
13.3 x 10-6
13.3 x 10-6 |
6.0 x 10-6
6.0 x 10-6 |
Conductivity
(BTU in/Ft2 °F Hr) |
1.4 |
610 - 1100 |
95 - 185 |
| (4) Comparative values of the coefficient of expansion for the filament wound back-up material, aluminum and steel are given in table 2. The similarity between steel and Duralon in the hoop direction should be noted. A higher value for thermal expansion is realized in the axial direction because of the fiberglass filament orientation. |
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