Rail Types BM S 20
| BM S 20-N | BM S 20-NU | BM S 20-C |
 |  |  |
Standard
Standard | Tapped Holes at Bottom
Tapped holes at bottom | Cover Strip
Cover strip |
Rail Specifications BM S 20
| Parameter | BM S 20-N | BM S 20-NU | BM S 20-C |
| Rail Width B1 (mm) | 20 | 20 | 20 |
| Rail Height J1 (mm) | 19 | 19 | 19 |
| Max Single Piece Length L3 (mm) | 3000 | 3000 | 3000 |
| Mounting Hole Pitch L4 (mm) | 60 | 60 | 60 |
| First/Last Hole Position L5/L10 (mm) | 28.5 | 28.5 | 28.5 |
| Weight per Meter (kg/m) | 2.2 | 2.3 | 2.1 |
Carriage Types BM W 20
| BM W 20-A / B | BM W 20-C / D |
 |  |
Standard / Standard Long
Standard / Standard long | Compact High / Compact High Long
Compact high / long |
Carriage Dimensions BM W 20
Carriage Specifications BM W 20
| Parameter | BM W 20-A | BM W 20-B | BM W 20-C | BM W 20-D | BM W 20-H | BM W 20-J | BM W 20-K | BM W 20-L | BM W 20-N |
| System Height A (mm) | 30 | 30 | 30 | 30 | 28 | 28 | 28 | 28 | 30 |
| Carriage Width B (mm) | 63 | 63 | 44 | 44 | 59 | 59 | 44 | 42 | 44 |
| Reference Surface Distance B2 (mm) | 21.5 | 21.5 | 12 | 12 | 19.5 | 19.5 | 12 | 11 | 12 |
| Front Center Lube Hole Position C1 (mm) | 5.2 | 5.2 | 5.2 | 5.2 | 4 | 4 | 4 | 4 | 5.2 |
| Side Lube Hole Position C3 (mm) | 5.2 | 5.2 | 5.2 | 5.2 | 3.2 | 3.2 | 3.2 | 3.2 | 5.2 |
| Side Lube Hole Position (2nd) C4 (mm) | 10.8 | 18.8 | 12.8 | 13.8 | 14.8 | 18.9 | 18.9 | 14.8 | 18.9 |
| Top Lube Hole Position C7 (mm) | 10.3 | 18.3 | 12.3 | 13.3 | 14.3 | 18.4 | 18.4 | 14.3 | 18.4 |
| Carriage Height J (mm) | 25.5 | 25.5 | 25.5 | 25.5 | 23.5 | 23.5 | 23.5 | 23.5 | 25.5 |
| Carriage Length L (mm) | 72.5 | 88.5 | 72.5 | 88.5 | 72.5 | 48.7 | 48.7 | 72.5 | 48.7 |
| Outer Mounting Hole Pitch L1 (mm) | 40 | 40 | 36 | 50 | 32 | — | — | 32 | — |
| Inner Mounting Hole Pitch L2 (mm) | 35 | 35 | — | — | — | — | — | — | — |
| Steel Body Length L6 (mm) | 51.5 | 65.5 | 49.5 | 65.5 | 49.5 | 25.7 | 25.7 | 49.5 | 25.7 |
| Lateral Mounting Hole Pitch N (mm) | 53 | 53 | 32 | 32 | 49 | 49 | 32 | 32 | 32 |
| Reference Surface Height O (mm) | 8.5 | 8.5 | 6.5 | 6.5 | 10 | 10 | 6.5 | 6.5 | 6.5 |
| Connection Thread (M×L) P | 6x6 | 6x6 | 6x6 | 6x6 | 3x5.5 | 3x5.5 | 3x5.5 | 3x5.5 | 6x6 |
Rigidity Curve and Load Ratings
Load Ratings
| Parameter | BM W 20-A | BM W 20-B | BM W 20-C | BM W 20-D | BM W 20-H | BM W 20-J | BM W 20-K | BM W 20-L | BM W 20-N |
| Static Load Capacity C₀ (N) | 31400 | 41100 | 31400 | 41100 | 31400 | 13100 | 13100 | 31400 | 13100 |
| Dynamic Load Capacity C₁₀₀ (N) | 14400 | 17400 | 14400 | 17400 | 14400 | 8400 | 8400 | 14400 | 8400 |
| Static Cross Moment Capacity M₀Q (Nm) | 373 | 490 | 373 | 490 | 373 | 150 | 150 | 373 | 150 |
| Static Longitudinal Moment Capacity M₀L (Nm) | 292 | 495 | 292 | 495 | 292 | 58 | 58 | 292 | 58 |
| Dynamic Cross Moment Capacity MQ (Nm) | 171 | 206 | 171 | 206 | 171 | 99 | 99 | 171 | 99 |
| Dynamic Longitudinal Moment Capacity ML (Nm) | 134 | 208 | 134 | 208 | 134 | 37 | 37 | 134 | 37 |
| Carriage Weight (kg) | 0.5 | 0.6 | 0.4 | 0.5 | 0.4 | 0.3 | 0.3 | 0.4 | 0.3 |
Load Rating Definitions
- C₀ = Static load capacity
- C₁₀₀ = Dynamic load capacity - 100km travel life
- M₀Q / MQ = Cross moment
- M₀L / ML = Longitudinal moment
Order Code Examples
Rail Order Code
BM S 20-N-G1-KC-R1-500-28.5-28.5
- BM S 20 = MONORAIL Ball Profile Rail Size 20
- N = Standard (top mounting)
- G1 = Very accurate
- KC = Standard straightness
- R1 = Reference at bottom
- 500 = Rail length 500mm
- 28.5-28.5 = First/last hole positions
Carriage Order Code
BM W 20-A-V1-S11-LV-CN
- BM W 20 = MONORAIL Ball Profile Carriage Size 20
- A = Standard carriage
- V1 = Low preload
- S11 = Lubrication port position (top center)
- LV = Full greasing
- CN = No coating (not chrome-plated; hard chromium is CH)
