Angular Contact Bearing Options
Applications have different bearing needs. Sometimes these requirements go above typical precision bearing specs.
For example, some may need:
- Heavier load-carrying capabilities
- Faster speeds
- More flexibility for temperature fluctuations
- So on and so forth
Applications with these needs probably won’t be satisfied by our stocked and “ready-to-ship” GMN angular contact bearings. That’s why we offer a variety of options to choose from in our angular contact bearing product line.
Our goal is to make sure every machine and application has the right precision angular contact bearing.
Find Your (Bearing) Match
Understanding our product label and part number will help spindle rebuilders, distributors and engineers recognize all the custom options available for order.
All customized options that aren’t widely available are manufactured at the GMN Germany headquarters and shipped to us in Houston, Texas. Our shipping turnaround times are very fast, usually the best turnaround times in the industry.
Angular Contact Bearing Options

Material Choices
– | No prefix: 52100 Bearing Steel (Balls & Rings) |
HY | Ball Material: Ceramic (Si3N4) Rings: 52100 Bearing Steel |
M | High Temperature Steel* |
N | High Nitrogen Steel* |
*Available on Request

Product Line Description & Designation
S | Standard bearing series, single relief on outer ring |
SM | High speed large ball series, similar to S series but supports higher speeds |
KH | Smaller balls & supports the highest speeds (for it’s size). Only series that can be ordered with seals. |
BNT | Separable bearing, similar to S series performance |
BHT | Separable bearing, similar to SM series performance |

Contact Angle Choices
C | 15° Contact Angle |
E | 25° Contact Angle |
Custom Contact Angle | 18° |

Bearing Size
6002 | Designation of dimensions series and bore diameter |

Seal Option
*only available on our KH series Angular Contact Ball Bearings
2RZ | Seals on both sides of the bearing (KH Series only) |

Cage Choices
*Other cages available on request
TA | Laminated phenolic resin cage guided on outer ring (standard) |
TXM | Molded plastic cage guided on outer ring, ball retaining |

Lubrication Choices
– | No lubrication |
L252 | Lubrication identifier (Ex. Turmogrease HS L252) |

Direct Lubrication Choices
– | Standard Lubrication |
A | Oil lubrication hole through outer ring on open side |
AB | Oil lubrication hole through outer ring on closed side |
L | Oil lubrication hole through outer ring on open side, outer ring oil groove with O-ring seals |
LB | Oil lubrication hole through outer ring on closed side, outer ring oil groove with O-ring seals |
AG | Grease lubrication hole through outer ring on open side |

Matching & Preload Choices
UL | Universal matching: Light preload |
UM | Universal matching: Medium preload |
US | Universal matching: Heavy preload |
UV | Universal matching: Special preload |
DF | Face-to-Face arrangement |
DB | Back-to-Back arrangement |
DT | Tandem arrangement |

Precision Class Definitions
*More details & specs can be found in our Bearing Catalog
P4 | European tolerance class: Matches to P4S per DIN 628-6, similar to ABEC 7 |
P2 | European tolerance class: Matches to ABEC 9 |
A7 | ABEC 7 per ABMA standards Similar to P4 |
A9 | ABEC 9 per ABMA standards Similar to P2 |
HG | GMNs standard for high precision. Defined as higher than P4, but lower than UP (below) |
UP | GMNs own standard for ultra precision. Defined as Higher than HG, but lower than P2 |

High Point Marking
R | High point mark for radial runout for both inner and outer rings |
Ri | High point mark for radial runout on inner ring |
Ra | High point mark for radial runout on outer ring |

Grading Defined
*For more information, please contact us.
X | Grading of Bore & Outer Diameter |

Bearing Sets
– | One Bearing |
D | Two Bearings |
T | Three Bearings |
Q | Four Bearings |

Heat Treatment Choices
S1 | Operating temp up to 392°F (200°C) |
S2 | Operating temp up to 482°F (250°C) |
S3 | Operating temp up to 572°F (300°C) |