Martin Bearing MaintenanceBearing Suffixes G - K
Bearing Suffixes: A - B :: C :: D - F :: G - K :: L - N :: P - S :: T - Z
| G | Single row angular contact ball bearing for universal matching. Two bearings arranged back-to-back or face-to-face will have a "Normal" axial clearance |
| Grease filling. A second letter indicates the temperature range of the grease and a third letter identifies the actual grease. The significance of the second letter is as follows: E Extreme pressure grease F Food compatible grease H, J High temperature grease, e.g. –20 to +130 °C L Low temperature grease, e.g. –50 to +80 °C M Medium temperature grease, e.g. –30 to +110 °C W, X Low/high temperature grease, e.g. –40 to +140 °C A figure following the three-letter grease code indicates that the filling degree deviates from the standard: 1, 2 and 3 indicate smaller than standard, 4 to 9 a larger fill Examples:
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| Single row angular contact ball bearing for universal matching. Two bearings arranged back-to-back or face-to-face will have a light pre-load | |
| Single row angular contact ball bearing for universal matching. Two bearings arranged back-to-back or face-to-face will have a moderate pre-load | |
| Single row angular contact ball bearing for universal matching. Two bearings arranged back-to-back or face-to-face will have a heavy pre-load | |
| Grease with a Polyurea thickener of consistency 2 to the NLGI Scale for a temperature range –30 to +150 °C (normal fill grade) | |
| Grease with a Polyurea thickener of consistency 2 to the NLGI Scale for a temperature range –40 to +150 °C (normal fill grade) | |
| H |
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| Case-hardened bearing or bearing components. For closer identification HA is followed by one of the following figures: 0 Complete bearing 1 Outer and inner rings 2 Outer ring 3 Inner ring 4 Outer ring, inner ring and rolling elements 5 Rolling elements 6 Outer ring and rolling elements 7 Inner ring and rolling elements | |
| Bainite-hardened bearing or bearing component. For closer identification HB is followed by one of the figures explained under HA | |
| Bearing or bearing components of ceramic. For closer identification HC is followed by one of the figures explained under HA | |
| Bearing or bearing component of vacuum remelted steel. For closer identification HE is followed by one of the figures explained under HA | |
| Martensite-hardened bearing or bearing component. For closer identification HM is followed by one of the figures explained under HA | |
| Grease fill for high temperatures (e.g. –20 to +130 °C). HT or a two figure number following HT identifies the actual grease. Filling degrees other than standard are identified by a letter or letter/figure combination following HTxx: A Filling degree less than standard B Filling degree greater than standard C Filling degree greater than 70% F1 Filling degree less than standard F7 Filling degree greater than standard F9 Filling degree greater than 70% Examples:
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| Bearing or bearing component of hardened stainless steel. For closer identification HV is followed by one of the figures explained under HA | |
| Needle roller bearing with lubricating hole(s) in inner ring; a figure following IS identifies the number of holes | |
| Needle roller bearing with annular groove and lubricating hole(s) in inner ring; a figure following ISR identifies the number of holes | |
| J | Pressed steel cage, rolling element centered, unhardened; different designs are identified by a figure, e.g. J1 |
| Pressed steel cage, hardened, outer ring centered | |
| Cage comprising of two flat washers of unhardened steel, riveted together | |
| Pressed steel cage, unhardened, welded | |
| K | Tapered bore, taper 1:12 |