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.
AS85560 Qualification
Tuflite bearings offer a series qualified to AS85560, the general specification for fiber reinforced plastic self-lubricating plain sleeve bearings.
Size range
Standard and special inch and metric sizes are available from 1/8” to 26” inside diameter.
Bore shapes
Many bore shapes are available including round, square, hex, spherical, helical hex and threaded. Other custom shapes are also available.
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
Tuflite® 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
Tuflite® bearings are typically resistant to most chemicals. Due to the wide range of exposures, specific conditions must be checked. Consult a Rexnord 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) Tuflite® can be used in cryogenic applications. Consult a Rexnord engineer. |
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Thermal Properties(4) |
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Tuflite® |
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 Tuflite 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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