MONORAIL BM Ball Profile Guideway

4-Row Ball Profile Guideway

Product Overview

MONORAIL BM is SCHNEEBERGER's four-row ball-type linear guideway system, renowned for its outstanding dynamic characteristics and cost-effectiveness. With optimized ball raceway design and streamlined component count, the BM series delivers exceptionally smooth operation, low pulsation, low friction, and high travel speeds, making it an ideal choice for high-speed precision positioning applications.

First Choice for High-Speed Applications

The BM series uses balls as rolling elements, offering lower friction coefficient compared to roller types. It is particularly suitable for high-speed operation (up to 5 m/s), frequent acceleration/deceleration applications, such as semiconductor equipment, electronics assembly machines, and precision measuring instruments.

The trapezoidal rail profile design ensures extremely high guideway rigidity while significantly reducing maintenance requirements. Wear parts can be replaced without disassembling the entire guideway system. Combined with compact wiper design that effectively reduces friction and wear, the system lifespan is extended. MONORAIL BM perfectly complements the MR roller guideway, providing optimal solutions for various applications.

BM System Features

Four-Row Ball O-Configuration - Provides uniform four-directional load capacity, ensuring high rigidity and precision
Optimized Ball Raceway Design - Reduced number of raceway transition points for exceptionally smooth operation
Low Friction, High-Speed Operation - Small ball contact area, low friction coefficient, maximum speed up to 5 m/s
Trapezoidal Rail Profile - Ensures extremely high system rigidity with stable guidance accuracy
Compact Wiper Design - Effective sealing with reduced friction and wear for extended service life
Modular Maintenance Design - Wear parts can be replaced independently without disassembling the entire rail
Long Rail System Length - Single-piece rail length up to 6000mm (Size 45)
Multiple Carriage Types - Over 10 carriage designs to meet various mounting space requirements

Rail Types

MONORAIL BM offers multiple rail types to meet different mounting and protection requirements.

Type	Description	Available Sizes	Features
N	Standard	20, 25, 30, 35, 45	Top mounting, countersunk screws, high system length
NU	Tapped Holes at Bottom	15, 20, 25, 30, 35, 45	Bottom mounting, threaded holes, high precision without lateral reference surface
C	Cover Strip Type	20, 25, 30, 35, 45	Top mounting, supports metal cover strip, high system length
CD	Through-Hardened Cover Strip	15, 20, 25, 30, 35	Top mounting, supports metal cover strip, through-hardened

Accuracy Grades

G0 - Highly Accurate G1 - Very Accurate G2 - Accurate G3 - Standard

Straightness

Standard (Contact us for special requirements)

Reference Surfaces

Standard Double-Sided Reference

Surface Treatment

Standard (No Coating) CN - Hard Chromium

Carriage Types

MONORAIL BM offers over 10 carriage types, covering different mounting methods, heights, and load requirements.

Type	Description	Available Sizes	Mounting	Features
A	Standard	15-45	Top	Standard length, balanced load capacity
B	Standard Long	15-45	Top	Extended design, higher moment load
C	Compact High	15-45	Top	Lower height, suitable for space-constrained applications
D	Compact High Long	15-45	Top	Extended compact high type, higher moment
E	Compact High, Lateral Mounting	25-30	Lateral	Side mounting holes, special mounting requirements
F	Compact	15-45	Top	Lowest height design
G	Compact Long	15-45	Top	Extended compact design
H	Standard Narrow	20-35	Top	Narrower design
J	Short	15-35	Top	Shortened length, compact space
K	Short Narrow	15-35	Top	Short and narrow design
L	Compact Short	20-35	Top	Low height, short length
M	Short Ultra-Narrow	30-35	Top	Most compact design
N	Compact Ultra-Short	20-35	Top	Low height, ultra-short length
2L	Two-Row	15-30	Top	Two rows of balls, extremely short length, suitable for light load high speed

Accuracy Grades

G0 - Highly Accurate G1 - Very Accurate G2 - Accurate G3 - Standard

Preload Classes

V0 - Extra Light Preload V1 - Light Preload V2 - Medium Preload V3 - High Preload

Reference Surfaces

R1 - Reference at Bottom R2 - Reference on Top

Surface Treatment

Standard (No Coating) CN - Hard Chromium

Lubrication Port

S10 - Left Center S11 - Right Center S12 - Left Top S13 - Left Side S20 - Top Right S21 - Top Left S22 - Right Top S23 - Right Side S32 - Bottom Left S33 - Bottom Right

Factory Lubrication

LN - Oil Protect LG - Grease Protect LV - Full Greasing

Available Sizes

Select a size to view detailed specifications:

BM Size 15

Rail width 15mm, smallest size, suitable for micro precision equipment.

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BM Size 20

Rail width 20mm, compact design for light-duty applications.

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BM Size 25

Rail width 23mm, versatile choice balancing size and load capacity.

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BM Size 30

Rail width 28mm, mainstream size for medium applications.

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BM Size 35

Rail width 34mm, balancing high load and high speed.

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BM Size 45

Rail width 45mm, largest size in BM series.

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Available Accessories

Rail Accessories

Plugs (BRK) Cover Strip (BAC) Cover Strip End Cap (EST) Cover Strip Fixing Clip (BSC) Cover Strip Assembly Tool (BWC)

Carriage Accessories

Additional Wiper (ZBV) Metal Wiper (ABM) Bellows (FBB) Bellows Adapter Plate (ZFB) Bellows End Plate (EFB) Assembly Rail (MRS)

Lubrication Accessories

Lubrication Connector M6/M8 Grease Nipple Hose Connector Lubrication Plate

Special Versions

WR - Full Stainless Steel SR - Stainless Steel Rail

View Complete Accessories List →

BM vs MR Comparison

Feature	MONORAIL BM (Ball)	MONORAIL MR (Roller)
Rolling Element	Steel balls	Cylindrical rollers
Friction Coefficient	Lower	Higher
Rigidity	Medium	Highest
Load Capacity	Medium	Highest
Maximum Speed	5 m/s	3 m/s
Applications	High speed, light to medium loads	High rigidity, heavy loads