iglide® F - Material data

Maximum surface speed

ft/s	Rotating	Oscillating	Linear
Constant	2.6248	1.9686	9.843
Short-term	4.9215	3.6091	16.405

Permitted surface speeds

The maximum permitted surface speeds are based on the operation period and the type of motion. A bearing is the most stressed in long-term rotating motions. Here the maximum speed for the iglide® F bearing is 2.6248 ft/s.

The maximum values specified in Table 11.2 are attained only at minimum pressure loads. In practice these limit values are not often attained due to interactions.

Figure 11.3: Maximum recommended surface pressure dependent on the temperature

Temperatures

The ambient temperatures strongly influence the features of bearings. The short-term permitted maximum temperature is 356° F. Long-term operating temperatures should not exceed 284° F.

With increasing temperatures, the compressive strength of iglide® F bearings decreases. Fig. 11.3 clarifies this connection. The wear too rises.

Temperature limits

iglide® F	Application temperature
Lower	- 40 °F
Upper, long-term	+ 284 °F
Upper, short-term	+ 356 °F

Figure 2.4: Coefficients of friction dependent on the surface speed, p = 108.75 psi

Friction and wear

The coefficients of friction in the dry operation are not so favorable in iglide® F bearings like in many other iglide® materials. However iglide® bearings can be lubricated without any problems, and iglide® F bearings attain excellent results compared among the lubricated iglide® bearings.

Friction and wear also depend to a high degree on the reverse partner. Figure 11.6 clearly shows how extremely smooth shafts raise the coefficient of friction of the bearing. The best suited is a smoothed surface with an average surface finish of Ra = 0.5 µm.

Coefficients of friction for iglide® F against steel
(Ra = 1 µm, 50 HRC)

iglide® F	Dry	Fat	Oil	Water
Coefficients of friction µ	0.1 - 0.39	0.09	0.04	0.04

Fig. 2.7: Wear, rotating application with different shaft materials, load p = 108.75 psi, v = 1.6405 ft/s

Shaft materials

Figures 11.7 to 11.9 display a summary of the results of tests with different shaft materials conducted with bearings made of iglide® F.

In the lowest load range, the hard-chromed shafts prove to be the most suitable counter partner in rotating applications with iglide® F bearings.

It behaves otherwise in pivoting applications (see Fig. 11.9) At 290 psi loads, the V2A shaft and the hard-chromed shaft are more favorable than the Cf53 shaft, having much higher coefficients of wear altogether than in rotations.

Please contact us in case the shaft material scheduled by you is not included in these diagrams.

Important tolerances for iglide® F bearings according to ISO 3547-1 after the press-fit.

Diameter d1 [inch]	Shaft h9 [inch]	iglide® F D11 [inch]
Up to 0.019685	0 - 0.0009843	0.0007874 - 0.0031496
> 0.1181 to 0.2362	0 - 0.0011811	0.0011811 - 0.0041339
> 0.2362 to 0.3937	0 - 0.0014173	0.0015748 - 0.0051181
> 0.3937 to 0.7087	0 - 0.0016929	0.0019685 - 0.0062992
> 0.7087 to 1.1811	0 - 0.0020472	0.0025591 - 0.0076771
> 1.1811 to 1.9685	0 - 0.0024409	0.0031496 - 0.0094488

Installation tolerances

iglide® F bearings are standard bearings for shafts with h-tolerance (recommended minimum h9).

After the installation in a housing bore with the tolerance H7, the inner diameter of the bearing automatically adjusts to the D11 tolerance.

Medium	Resistance
Alcohol	+ to 0
Hydrocarbons	+
Fats, oils, without additives	+
Fuels	+
Diluted acids	0 to -
Strong acids	-
Diluted bases	+
Strong bases	+ to 0

+ resistant      0 conditionally resistant      - non-resistant

Figure 11.10: Influence of humidity absorption of iglide® F bearings

Electrical properties

Specific forward resistance	< 103 Ωcm
Surface resistance	< 102 Ω

Chemical resistance

iglide® F bearings have a good resistance against chemicals. The particularly high resistance to lubricants is to be highlighted, even at high temperatures (around 248° F). Hence the iglide® F bearings are particularly suitable for applications that call for lubrication necessitated by other parts.

The iglide® F is not affected by most weak organic and inorganic acids.

The humidity absorption of iglide® F bearings amounts to about 1.8% in standard climatic conditions. The saturation limit in water is 8.4%. This should be considered according to application conditions.

Radioactive rays

iglide® F bearings are radiation resistant up to a radioactive intensity of 3 x 10² Gy.

UV-resistant

iglide® F bearings are permanently resistant against UV rays.

Vacuum

In application in vacuum, the potentially existent moisture content is degassed. For this reason only the dry iglidur® F bearings are suitable for vacuum.

Electrical properties

In contrast to most other iglide® materials, the iglide® F bearings are electrically conductive.