Duralon linear bearings interchange with conventional linear reciprocating ball bearings. They work well in contaminated or wash down environments where conventional linear reciprocating ball bearings fail.
Bearing Construction
The bearing consists of a self-lubricating woven Teflon® fiber and polyester fiber liner supported by a filament wound continuous fiberglass fiber and epoxy resin matrix.
Size range
Standard and special inch and metric sizes are available from 1/4” to 4” inside diameter
Configurations
Available in round bore and open configuration to clear pedestal shaft mount.
Load Capacity
Typical dynamic loads:
4,000 to 30,000 psi
Ultimate strength:
77,000 psi (for 1/8” wall section)
Motion
The bearings work well in oscillatory, pivot, linear sliding and slow speed full rotation.
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 filament wound 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 between it and the housing or the shaft.
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 |
1.5 x 106 |
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 |
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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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