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MONORAIL BM Order Key

Order Key for Ball Profile Guideways

Rail Order Code Structure

Rail Code Format

BM S [Size]-[Type]-[Grade]-[Hole]-[Ref]-[Length]-[L5]-[L10]-[Surface]

Position Code Description Options
1 BM S Product Series MONORAIL BM Rail
2 [Size] Size 15, 20, 25, 30, 35, 45
3 [Type] Rail Type N (Standard), NU (Tapped bottom), C/CD (Cover strip)
4 [Grade] Accuracy Grade G0, G1, G2, G3
5 [Hole] Mounting Hole Type KC (Countersunk), K (Cylindrical)
6 [Ref] Reference Surface Position R1 (Bottom), R2 (Top)
7 [Length] Rail Length In mm
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 — (Standard), CN (Hard chromium), CH (Black oxide)

Rail Order Example

BM S 25-N-G1-KC-R1-800-28.5-28.5-CN

  • BM S 25 = MONORAIL BM Rail Size 25
  • N = Standard (top mounting)
  • G1 = Very Accurate (±10µm)
  • KC = Countersunk mounting holes
  • R1 = Reference at bottom
  • 800 = Rail length 800mm
  • 28.5-28.5 = First/last hole positions 28.5mm each
  • CN = Hard chromium coating

Carriage Order Code Structure

Carriage Code Format

BM W [Size]-[Type]-[Preload]-[Lube]-[Factory]-[Surface]

Position Code Description Options
1 BM W Product Series MONORAIL BM Carriage
2 [Size] Size 15, 20, 25, 30, 35, 45
3 [Type] Carriage Type A, B, C, D, E, F, G, H, J, K, L, M, N
4 [Preload] Preload Class V0, V1, V2, V3
5 [Lube] Lubrication Port Position S10, S11, S12, S13, S20, S21...
6 [Factory] Factory Lubrication LN (Oil), LG (Thin grease), LV (Full grease)
7 [Surface] Surface Treatment — (Standard), CN (Hard chromium), CH (Black oxide)

Carriage Order Example

BM W 25-A-V1-S11-LV-CN

  • BM W 25 = MONORAIL BM Carriage Size 25
  • A = Standard carriage
  • V1 = Light preload (3% C₀)
  • S11 = Lubrication port at top center
  • LV = Full greasing as delivered
  • CN = Hard chromium coating

Carriage Type Reference

Type Name Features Available Sizes
A Standard Standard length, balanced load capacity 15-45
B Standard Long Extended design, higher moment 15-45
C Compact High Lower height, high load 15-45
D Compact High Long Extended compact high type 15-45
E Compact High, Lateral Mounting Side mounting holes 25-30
F Compact Lowest height design 15-45
G Compact Long Extended compact design 15-45
H Standard Narrow Narrower design 20-35
J Standard Short Shortened length, compact space 15-35
K Standard Ultra-Short Shortest length 15-35
L Compact Short Low height, short length 20-35
M Standard Ultra-Short Narrow Most compact design 30-35
N Compact Ultra-Short Low height, ultra-short length 20-35

Accuracy Grade Details

Grade Name Height Tolerance A/B2 Matched Deviation ΔA/ΔB2 Application
G0 Highly Accurate ± 5 µm 3 µm Optical equipment, precision metrology
G1 Very Accurate ± 10 µm 5 µm CNC machine tools, semiconductor
G2 Accurate ± 20 µm 7 µm General industrial automation
G3 Standard ± 30 µm 25 µm Material handling, general applications

Preload Class Details

Class Preload Force Rigidity Friction Application
V0 0-2% C₀ Lowest Lowest Extremely low friction requirement, uniform load
V1 3% C₀ Low Low High-speed applications, light load
V2 8% C₀ Medium Medium General applications, medium load
V3 13% C₀ High High High rigidity requirement, impact loads

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)
  • Confirm lead time for special specifications in advance
  • Stainless steel versions (WR/SR) require separate inquiry
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