Linear guide rail
Linear Guide Rail
BOM manufactures linear guide systems across five series — HG (standard heavy-load), EG (low-profile), QH (caged ball, low-noise), MGN (miniature), and MGW (miniature wide) — covering rail widths from 7 mm to 65 mm. Each series features precision-hardened steel rails and recirculating ball carriages for high-accuracy linear motion. Cut-to-length rails, custom hole patterns, and surface treatment options are available.
Key Features
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Five Series: HG, EG, QH, MGN, MGW
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Rail Widths from 7 mm to 65 mm
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Multiple Preload Classes (Z0 / ZA / ZB)
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Precision Grades N, H, and P
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Cut-to-Length and Custom Rail Service
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Cut-to-Length Rails and Custom Surface Treatments Available
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Description
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Linear Guides
Multiple Preload Classes Cut-to-Length Service
BOM manufactures linear guide systems across five series: HG (standard heavy-load), EG (low-profile), QH (caged ball, low-noise), MGN (miniature), and MGW (miniature wide), covering rail widths from 7 mm to 65 mm. Each series comprises precision-hardened steel rails and recirculating ball carriages engineered for high-accuracy linear motion in demanding industrial applications. Four-row or two-row ball recirculation provides smooth, low-friction travel with consistent running resistance across the full rail length.
- Series Range: HG standard and wide-flange for heavy cutting loads; EG low-profile for space-constrained designs; QH caged-ball for low noise and extended lubrication intervals; MGN and MGW miniature for compact precision equipment
- Preload Classes: Z0 (zero clearance) through ZB (medium preload), selectable per application from low-friction high-speed travel to maximum rigidity under cutting forces and vibration
- Precision Grades: Normal (N), High (H), and Precision (P) accuracy classes for applications ranging from general automation to sub-micron positioning
- Sealing: Standard end seals for general use; optional wiper seals and heavy-duty scrapers for swarf-heavy or contaminated environments
- Rail Service: Standard lengths and cut-to-length rails; custom mounting hole patterns and rail splicing for long-travel applications
- Customization: Full-specification custom manufacturing available, covering dimensions, materials, coatings, and bearing structure
Linear Guides: Dimensions & Load Ratings
Z0 preload class | CA block type shown | Representative catalog values; contact BOM for confirmed specifications
Custom Linear Guide Manufacturing
Customizable Engineering Support
BOM manufactures custom linear guide systems for applications where catalog specifications do not meet design requirements. Custom capabilities range from cut-to-length rails with custom hole patterns to special surface treatments and application-specific sealing configurations.
- Rail Customization: Cut-to-length rails, custom mounting hole patterns, recessed holes, and rail splicing features for long-travel applications
- Carriage Options: Non-standard block lengths, special preload settings, and application-specific sealing configurations
- Surface Treatments: Anti-corrosion coatings, hard chrome plating, and black oxide finishes for harsh operating environments
- Customization: Full-specification custom manufacturing available, covering dimensions, materials, coatings, and bearing structure
Applications
CNC Machine Tools
X, Y, Z and secondary axis linear motion in milling machines, machining centers, grinding machines, and lathes. HG and QH series with medium-to-heavy preload provide the rigidity needed to resist deflection during heavy material removal; EG low-profile series suits compact machine designs.
Semiconductor & Electronics Equipment
High-precision pick-and-place, wafer inspection, and PCB processing equipment demanding sub-micron positioning repeatability. MGN and MGW miniature series suit compact stages; QH caged-ball series provides the smooth, quiet motion required in controlled environments.
Gantry Robots & Cartesian Systems
Multi-axis Cartesian and gantry robot linear axes where high speed, high acceleration, and smooth motion are required across long travel lengths. Rail splicing and cut-to-length service support the extended travel distances typical of large-format gantry installations.
Medical & Optical Instruments
CT scanner gantries, surgical robot linear axes, and microscope stages requiring quiet, smooth, and precise linear motion. QH caged-ball series minimizes operating noise; MGN miniature series suits space-constrained medical positioning systems with low drive torque requirements.
About BOM Bearing
BOM Bearing is a professional manufacturer of linear guide systems, delivering high-precision linear motion solutions for machine tools, semiconductor equipment, robotics, and medical instruments worldwide.
- Quality Assurance: ISO 9001, IATF 16949, and ISO 14001 certified; quality and environmental standards validated at every production stage
- Wide Product Range: HG, EG, QH, MGN, and MGW series across rail widths from 7 to 65 mm; all preload classes and carriage configurations available
- Custom Manufacturing: Full-specification customization from non-standard dimensions and alternative materials to specialized coatings and complete bearing architecture redesign, engineered to your exact requirement
- Technical Support: Professional engineering team for preload matching, travel life calculation, custom rail design, and application guidance
- Fast Delivery: Efficient production lines and global logistics network ensuring timely delivery
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Frequently Asked Questions (FAQ)
What is the difference between HG, EG, QH, MGN, and MGW series linear guides?
HG is the standard heavy-load series with four-row ball recirculation, the most widely used in machine tools and industrial equipment. EG is a low-profile variant with reduced block height for space-constrained designs, offering the same four-direction load capacity. QH uses caged balls (ball retainers) on the same rail as HG, reducing noise, improving lubrication distribution, and extending service life, making it ideal for quiet or cleanroom environments. MGN and MGW are miniature series for compact equipment; MGW has a wider block than MGN for improved moment load resistance.
What do the preload classes Z0, ZA, and ZB mean?
Preload class defines the internal preload between the balls and raceways. Z0 (zero clearance / very light preload, 0–0.02C) provides the lowest friction and suits high-speed, low-load applications. ZA (light preload, 0.03–0.05C) eliminates backlash with minimal friction increase, suitable for precision positioning. ZB (medium preload, 0.06–0.08C) provides maximum rigidity for applications with significant vibration or large external moments, at the cost of higher friction and heat generation.
Are QH series carriages interchangeable with HG series?
Yes. QH carriages are designed to mount on the same HGR rail profiles as standard HG carriages. This means you can upgrade from HG to QH on an existing installation to gain the benefits of caged-ball technology (lower noise, smoother motion, and longer re-lubrication intervals) without replacing the rails. Load ratings are equivalent between HGH and QHH of the same size.
How is travel life calculated for a linear guide?
Nominal travel life (L, in km) is calculated using the rated dynamic load C and the applied equivalent load P: L = (C/P)³ × 50 km for ball-type guides. Life is significantly extended by correct preload selection, proper lubrication, effective sealing, and keeping applied loads within the rated capacity. Environmental factors such as temperature, contamination, and vibration also affect actual service life.
Can BOM manufacture custom linear guide systems?
Yes. BOM manufactures custom linear guide systems tailored to specific application requirements. Common customization includes cut-to-length rails, custom mounting hole patterns, recessed holes, rail splicing for long-travel installations, anti-corrosion surface treatments, and special coatings for harsh operating environments. Heavy-duty wiper seals and scrapers for contaminated conditions are also available. Contact our engineering team with your application requirements for a detailed proposal.
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