iglide® H370 - Material data

Maximum surface speed

fpm	Rotating	Oscillating	Linear
Constant	236	157	787
Short-term	295	216	984

Permitted surface speeds

The maximum permitted surface speed is dependent on whether the temperature in the bearing location rises strongly or not. iglide® H370 is suitable for surface speeds up to 197 fpm (1 m/s) (rotating) and 591fpm (3 m/s) (linear) respectively.

The maximum values stated in Table 14.2 are valid only with minimum pressure loads and are often not attained in practice.

Figure 14.3: Maximum recommended surface pressure dependent on the temperature

Figure 14.4: Wear dependent on the temperature, rotating application with p = 109 psi (0.75 Mpa) and V = 98 fpm (0.5 m/s) (Cf53 shaft)

Temperatures

iglide® H370 is an extremely temperature-resistant material. With a short-term permitted maximum temperature of 464° F (240° C), the iglide® H370 bearings can in otherwise unloaded condition be subjected for instance, to a paint drying process. With increasing temperatures, the compressive strength of iglide® H370 bearings decreases. Fig. 14.3 clarifies this connection.

The temperatures prevailing in the bearing system also have an influence on the bearing wear. The wear rises with increasing temperatures.

iglide® H370 loses about 75% of its compressive strength with a rise in temperature range, from room temperature to 302° F (150° C). In contrast the increase in wear is hardly noticeable in the same temperature range.

Temperature limits

iglide® H370	Application temperature
Lower	- 40 °F
Upper, long-term	+ 392 °F
Upper, short-term	+ 464 °F

Figure 2.4: Coefficients of friction dependent on the surface speed, p =109 psi (0.75 Mpa)

Friction and wear

The coefficients of friction and wear in iglide® H370 are more favorable than in iglide® H. There is no better material than iglide® H370 especially for underwater applications. The coefficient of friction alters only little, like the wear resistance with increasing load and surface speed. This connection illustrates the excellent suitability of iglide® H370 bearings with high loads.

Friction and wear also depend to a high degree on the reverse partner. Very smooth shafts increase the coefficient of both friction and wear. The ideally suited is a smoothed surface with an average surface finish of Ra = 0.2 to 0.4 µm.

Coefficients of friction for iglide® H370 against steel
(Ra = 1 µm, 50 HRC)

iglide® H370	Dry	Fat	Oil	Water
Coefficients of friction µ	0,07 - 0,17	0,09	0,04	0,04

Fig. 2.7: Wear, rotating application with different shaft materials, load p = 109 psi (0.75 Mpa), v = 98 fpm (0.5 m/s)

Shaft materials

The diagrams display a summary of the results of tests with different shaft materials conducted with bearings made of iglide® H370.

For loads up to 290 psi (2 MPa), the hard-chromed shaft is the best counter partner for the iglidur® H370 bearings in rotating applications. The high coefficients of wear with V2A shafts are striking, which due to their extremely smooth surfaces are prone to the stick-slip effect. The St37 shaft shows better values than Cf53, despite same values in the lowest range, from 290 psi (2 MPa).

On the other hand, the V2A shaft shows a clear advantage in pivoting movements. As the diagram shows, it generates a lower wear than the Cf53 shaft by factor 11 in pivoting application at 290 psi (2 MPa) .

Please contact us in case the shaft material scheduled by you is not included in this list.

Important tolerances for iglide® H370 bearings according to ISO 3547-1 after the press-fit.

Diameter d1 [mm]	Shaft h9 [mm]	iglide® H F10 [mm]
Up to 0.019685	0 - 0.0009842	+0.0002362 + 0.0018110
> 0.118 to 0.236	0 - 0.0011811	+0.0003937 + 0.0022835
> 0.236 to 0.394	0 - 0.0014173	+0.0005118 + 0.0027953
> 0.394 to 0.709	0 - 0.0016929	+0.0006299 + 0.0033858
> 0.709 to 1.181	0 - 0.0020472	+0.0007874 + 0.0040945
> 1.181 to 1.969	0 - 0.0024409	+0.0009843 + 0.0049213
> 1.969 to 3.150	0 - 0.0029134	+0.0011811 + 0.0059055

Installation tolerances

iglide® H370 bearings are standard bearings for shafts with h-tolerance (recommended minimum h9).

After the installation in a housing bore with H7 tolerance, the inner diameter of the bearing automatically adjusts to F10 tolerance.

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

+ resistant      0 conditionally resistant      - non-resistant

Electrical properties

Specific forward resistance	< 105 Ωcm
Surface resistance	< 105 Ω

Chemical resistance

iglide® H370 bearings have a good resistance against chemicals. They are resistant to most lubricants. The iglide® is not affected by most weak organic and inorganic acids.

The humidity absorption of iglide® H370 bearings is about 0.1% in standard climatic conditions. The saturation limit in water is likewise below 0.1%. iglide® H370 is therefore the best suited bearing material for underwater applications.

Radioactive rays

H370 withstands both the neutron and gamma particle radiations without noticeable loss to its excellent mechanical properties. iglide® H370 bearings are radiation resistant up to a radioactive intensity of 2 x 10² Gy.

UV-resistant

iglide® H370 bearings are permanently resistant against UV rays.

Vacuum

Water elements are degassed in the vacuum. Due to the low water absorption, an application in the vacuum is however possible.

Electrical properties

iglide® H370 bearings are electrically conductive.