Complete Order Designation Structure
The order designation for an AXRY bearing with an angle measuring system is divided into a bearing segment and a measuring ring segment, joined by MI or MA. A complete example is shown below:
Bearing segment
AXRY 260 - NGX - SBI - PRR50 - H1* - H2* - AC - JXXXX - L120 | MI - A - 3 - 500 - K
Measuring ring segment (measuring system + parameters)
The table below explains each segment of the designation above (using AXRY 260-NGX-SBI-PRR50-AC | MI-A-3-500-K as an example):
| Segment | Position | Example | Description |
|---|
| Bearing segment | Series | AXRY | Axial/radial roller bearing |
| Bore | 260 | Bearing bore [mm] |
| Generation | NGX | NGX generation |
| Lubrication connection | SBI | Additionally on the inner ring (optional) |
| Accuracy | PRR50 | Axial and radial runout tolerances restricted (optional) |
| Connection dimension | H1/H2 | Restricted connection dimensions H1/H2 (optional; *only for bores 580 and 650) |
| Alignment | AC | Customized alignment for full support-ring installation (optional) |
| Regulation | JXXXX | Customized regulation number (optional, issued by myonic) |
| Lubrication | L120 | Ungreased, only preserved (optional) |
| Measuring ring segment | Measuring system | MI/MA | MI = incremental / MA = absolute angle measuring system |
| Reference mark position | A | A = outside, I = inside (MI only) |
| Graduation accuracy | 3 | ±3 / ±5 / ±10 µm |
| Graduation period | 500 | 500 / 1000 / 3000 µm (depending on MI/MA) |
| Reference mark type | K | Distance-coded reference mark, etc. (MI only) |
All suffixes are optional (those marked * apply only to bores 580/650 mm); the applicability of each measuring ring field depends on MI/MA, as detailed in the sections below. The authoritative definition of each code is given in the detail tables below.
Basic Designation (Bearing Segment)
| Code | Designation | Description |
| AXRY | Construction series | Axial/radial roller bearing series |
| 260 (example) | Bore in mm | Bearing bore (mm); available sizes: 150, 180, 200, 260, 325, 395, 460, 580, 650 |
| NGX / NGS / EX | Bearing type | Bearing generation |
Measuring System
The MI and MA suffixes are placed after all optional suffixes of the bearing segment and indicate the design and mounting of the measuring system.
| Code | Definition | Description |
| -MI | Incremental on the inner ring | Incremental measuring system mounted on the inner ring |
| -MA | Absolute on the inner ring | Absolute measuring system mounted on the inner ring |
MI vs MA System Comparison
| Feature | MI (Incremental) | MA (Absolute) |
| Encoding method | Incremental counting + distance-coded reference | Absolute position encoding |
| Power-up position | Requires a reference run (<30°) | Immediately available |
| Measuring ring height | 10 mm | 14 mm |
| Maximum accuracy | ±2 µm arc length | ±1 µm arc length |
Measuring Ring Parameters (Measuring Ring Segment)
After the measuring system code (MI or MA), the following parameter codes follow in order.
Notes - Each field code follows directly, separated by "-", e.g.:
MI - A - 3 - 500 - K - Fields marked "MI only" do not apply to the MA system
Position of the Reference Mark
| Code | Definition | Description | Applicability |
| I | Reference mark inside | Reference mark on the inside | MI only |
| A | Reference mark outside | Reference mark on the outside | MI only |
Graduation Accuracy
| Code | Accuracy |
| 3 | ±3 µm |
| 5 | ±5 µm |
| 10 | ±10 µm |
Graduation Period
| Code | Period | Applicability |
| 500 | 500 µm | MI only |
| 1000 | 1000 µm | MI and MA |
| 3000 | 3000 µm | MI only |
Reference Marks
| Code | Definition | Description | Applicability |
| (No suffix) | — | No reference mark | — |
| K | Distance-coded reference mark | Distance-coded reference mark | MI only |
| RI | 1 reference mark | Single reference mark | MI only |
Optional Suffixes of the Bearing Segment
The following suffixes are placed after the bearing generation (NGX/NGS/EX) and before the measuring system code (MI/MA).
Lubrication Connection
| Code | Definition | Description |
| (No suffix) | Only on outer ring | Lubrication connection only on the outer ring (standard for inner ring rotation) |
| -SBI | Additionally on inner ring | Additional lubrication connection on the inner ring (for outer ring rotation) |
Accuracy Requirements
| Code | Definition | Description |
| (No suffix) | Standard | Standard accuracy |
| -PRR50 | Axial and radial runout tolerances restricted | Axial and radial runout tolerances restricted |
| -PRR30 | Axial and radial runout tolerances high precision | Axial and radial runout tolerances, high precision |
Connection Dimensions (*only for bores 580/650 mm)
| Code | Definition | Description |
| (No suffix) | Standard | Standard connection dimensions |
| -H1 | Restricted connection dimension H1 | Reduced connection dimension H1 |
| -H2 | Restricted connection dimension H2 | Reduced connection dimension H2 |
Bearing Alignment
| Code | Definition | Description |
| (No suffix) | Standard | Standard alignment |
| -AC | Customized alignment | Customized alignment |
Regulation
| Code | Definition | Description |
| (No suffix) | Standard | Standard specification |
| -JXXXX | Customized regulation (number is issued by myonic) | Customized regulation (number issued by myonic) |
Lubrication
| Code | Definition | Description |
| (No suffix) | Standard grease | Standard grease |
| -L120 | Bearing ungreased, only preserved (e.g. for oil lubrication) | Ungreased, only preserved; for oil lubrication systems |
| -GXXX | Special grease (number is issued by myonic) | Special grease (number issued by myonic) |
Size and Availability
| Measuring System | Applicable Bearing Series | Available Bore Range [mm] |
| MI (Incremental) | AXRY-NGX, AXRY-EX | 150 – 650 |
| MA (Absolute) | AXRY-NGX, AXRY-NGS, AXRY-EX | 150 – 650 |
Because of the measuring ring height (MI: 10 mm, MA: 14 mm), bearings with a measuring system have a correspondingly greater overall height. See the individual product data sheets for detailed dimensions.
Order Examples
| Complete Designation | Description |
| AXRY 260-NGX-MI-A-3-500-K | Bore 260 mm, NGX, incremental; reference mark outside, accuracy ±3 µm, period 500 µm, distance-coded |
| AXRY 325-NGX-MA | Bore 325 mm, NGX, absolute measuring system |
| AXRY 460-NGS-MA | Bore 460 mm, NGS, absolute measuring system |
| AXRY 260-NGX-SBI-MI-A-5-1000 | Bore 260 mm, outer ring rotation (SBI), incremental; accuracy ±5 µm, period 1000 µm |
| AXRY 395-NGX-PRR50-MA | Bore 395 mm, restricted runout tolerances (PRR50), absolute measuring system |
| AXRY 580-NGX-SBI-PRR50-H1-H2-AC-MI-A-3-1000-K | Bore 580 mm, outer ring rotation, restricted accuracy, reduced H1/H2, customized alignment, incremental; distance-coded |
| AXRY 650-NGX-L120-MI-I-5-1000-RI | Bore 650 mm, ungreased (oil lubrication), incremental; reference mark inside, accuracy ±5 µm, single reference mark |
Scope of Delivery
myonic Supply Scope
- Bearing with measuring ring already installed
- Threads on the outer ring for mounting the measuring head
- Can be mounted axially or radially (2 positions each)
Measuring Head Procurement
Measuring heads must be purchased directly from Heidenhain (AMO). myonic works closely with AMO and can assist with rapid connection.
Ordering Information
For further technical details or special designs, please contact our application engineering team (sales@eb-system.com).