Rail Order Code Structure
Rail Code Format
MR S [Size]-[Type]-[Grade]-[Hole]-[Ref]-[Length]-[L5]-[L10]-[Surface]
| Position | Code | Description | Options |
| 1 | MR S | Product Series | MONORAIL MR Rail |
| 2 | [Size] | Size | 25, 30, 35, 45, 55, 65, 100 |
| 3 | [Type] | Rail Type | N, ND, NU, NUD, C, CD (see table below) |
| 4 | [Grade] | Accuracy Grade | G0, G1, G2, G3 |
| 5 | [Hole] | Mounting Hole Type | KC (standard straightness) |
| 6 | [Ref] | Reference Surface Position | R1 (Bottom), R2 (Top) |
| 7 | [Length] | Rail Length | In mm (max 6000mm) |
| 8 | [L5] | First Hole Position | Distance to first mounting hole (mm) |
| 9 | [L10] | Last Hole Position | Distance to last mounting hole (mm) |
| 10 | [Surface] | Surface Treatment | CN (No coating), CH (Hard chromium) |
Rail Type Codes
| Code | Type | Available Sizes | Description |
| N | Standard | 25-100 | Top mounting, countersunk screw holes |
| ND | Standard, through-hardened | 25, 35, 45 | Through-hardened raceway, high load environments |
| NU | Bottom tapped holes | 25-65 | Bottom mounting, threaded holes |
| NUD | Bottom tapped holes, through-hardened | 35 | Bottom mounting, through-hardened raceway |
| C | Cover strip type | 25-65 | Supports metal cover strip, better protection |
| CD | Through-hardened cover strip type | 25 | Metal cover strip, through-hardened raceway |
Rail Order Example
MR S 35-N-G1-KC-R1-1200-32-32-CN
- MR S 35 = MONORAIL MR Rail Size 35
- N = Standard type (top mounting)
- G1 = Very accurate
- KC = Standard straightness
- R1 = Reference at bottom
- 1200 = Rail length 1200mm
- 32-32 = First/last hole positions 32mm each
- CN = No coating (not chrome-plated; hard chromium is CH)
Carriage Order Code Structure
Carriage Code Format
MR W [Size]-[Type]-[Preload]-[Lube]-[Factory]-[Surface]
| Position | Code | Description | Options |
| 1 | MR W | Product Series | MONORAIL MR Carriage |
| 2 | [Size] | Size | 25, 30, 35, 45, 55, 65, 100 |
| 3 | [Type] | Carriage Type | A, B, C, D, E, F, G, P (see table below) |
| 4 | [Preload] | Preload Class | V1, V2, V3 |
| 5 | [Lube] | Lubrication Port Position | S10~S99 (see accessories page) |
| 6 | [Factory] | Factory Lubrication | LN (Oil), LG (Thin grease), LV (Full grease) |
| 7 | [Surface] | Surface Treatment | CN (No coating), CH (Hard chromium) |
Carriage Order Example
MR W 35-A-V2-S11-LV-CN
- MR W 35 = MONORAIL MR Carriage Size 35
- A = Standard carriage type
- V2 = Medium preload
- S11 = Lubrication port at top center
- LV = Full greasing
- CN = No coating (not chrome-plated; hard chromium is CH)
Carriage Type Reference
| Type Image | Type | Name | Features | Available Sizes |
 | A | Standard | Standard length, high load and moment capacity | 25-100 |
 | B | Standard long | Extended design, higher moment load capacity | 25-100 |
 | C | High/flat | Lower height while maintaining high load capacity | 25-65 |
 | D | High/flat long | Extended high/flat design | 25-65 |
 | E | High/flat, side fixing | Side mounting hole design | 25, 35 |
 | F | Flat | Lowest height design | 25-55 |
 | G | Flat long | Extended flat design | 25-55 |
 | P | Standard extra long | Extra long design, highest moment capacity | 65 |
Accuracy Grade Details
| Grade | Name | Height Tolerance A/B2 | ΔA/ΔB2 | ΔA Standard |
 G0 | Highly accurate | ± 5 µm | 3 µm | 10 µm |
 G1 | Very accurate | ± 10 µm | 5 µm | 20 µm |
 G2 | Accurate | ± 20 µm | 7 µm | 40 µm |
 G3 | Standard | ± 30 µm | 25 µm | 60 µm |
Accuracy Selection Guide
- G0 - For µm-level precision machining and measurement applications
- G1 - Machine tool spindles, high-precision positioning stages
- G2 - General CNC machine tools, automation equipment
- G3 - Non-precision positioning, material handling systems
Preload Class Details
| Class | Preload Force | Rigidity | Friction | Application |
 V1 | Light preload | Low | Low | Low friction requirements, light uniform loads |
 V2 | Standard preload | Medium | Medium | General machine tool applications, balanced rigidity and friction |
 V3 | Medium preload | High | High | High rigidity requirements, precision machining |
Surface Treatment Options
| Code | Treatment | Features | Application |
 CN | No coating (None) | Standard steel surface, requires regular lubrication for rust prevention | Standard steel surface, requires regular lubrication for rust prevention |
 CH | Hard chromium | Excellent corrosion resistance, high wear resistance, good emergency running properties | Harsh environments, additional protection required |
Integrated System Ordering
MONORAIL MR can be combined with measuring systems to form complete positioning solutions:
| Combination | Description | Available Sizes |
| AMS 3B | MONORAIL MR + Incremental measuring system | 25, 35, 45, 55, 65 |
| AMSABS 3B | MONORAIL MR + Absolute measuring system | 25, 35, 45, 55, 65 |
Ordering Notes
Important Reminders
- Rails and carriages must be of the same size and accuracy grade
- Matched carriages should be ordered together to ensure consistency
- Rail length must account for first/last hole positions (L5, L10)
- MR series single-piece rails can be up to 6000mm long
- Through-hardened rails (ND/NUD/CD) are suitable for high load or impact environments
- Special specifications (G0 accuracy, special lengths, etc.) - please confirm lead time in advance
Complete Order Example
Machine tool X-axis assembly order:
- Rails: MR S 45-N-G1-KC-R1-1500-40-40-CN × 2 pcs
- Carriages: MR W 45-A-V2-S11-LV-CN × 4 pcs
Description: Two Size 45 rails (1500mm), each paired with two standard carriages, G1 accuracy with V2 preload, hard chrome protection.