MGN12 Linear Rail
MGN12 miniature linear guide rail in 9Cr18Mo martensitic stainless steel, part of the MGN 9 / 12 / 15 series with two-row Gothic-arch ball circuit. The MGN12C carriage delivers 3.7 kN dynamic load and 5.4 kN static load. Supplied with MGN-C (standard) or MGN-H (long) carriages for 3D printers, desktop CNC, medical devices, and humid environments where corrosion resistance is essential.
Key Features
- 9Cr18Mo stainless steel as standard material
- 3.7 kN dynamic load (MGN12C), two-row Gothic arch
- Friction coefficient 0.002β0.004 (MGN12C)
- MGN-C / MGN-H carriages; rail up to 1000 mm
- MOQ 50 pcs; sample sets of 5β10 pieces
- GCr15 chrome steel option for indoor use
Common Sourcing Problems & How We Solve Them
Buyer Pain Points
- Inconsistent dimensional tolerances across batches cause machine downtime and re-work costs
- Suppliers unable to provide material certs, inspection reports or CE documentation for customs clearance
- Long lead times and high MOQ requirements make sample evaluation and first orders difficult
Dongfeng Solution
- ISO 9001:2015 process controls with CMM dimensional inspection on every production batch
- Full documentation package: material cert, SGS test report, CE declaration, packing list on request
- Flexible MOQ from 1 piece for samples; bulk order lead time 15β20 working days
Performance Data
- 10+ years of linear motion component manufacturing β 50+ export markets served
- Hardness tested to HRC 58β62; dimensional tolerance held to JIS / ISO / DIN standard grade
- CE & SGS certified; ISO 9001:2015 quality management system in production
Utility record
| railSeries | MGN 9 / 12 / 15 (this listing: MGN12) |
|---|---|
| carriageTypes | MGN-C (standard) / MGN-H (long) |
| ballCircuit | Two-row Gothic arch, equal four-direction load |
| material | 9Cr18Mo martensitic stainless steel; GCr15 chrome steel option |
| hardness | HRC 54β58 (stainless) / 58β62 (chrome steel) |
| dynamicLoad | 3.7 kN |
| staticLoad | 5.4 kN |
| maxRailLength | 1000 mm (splicing available) |
| frictionCoefficient | 0.002β0.004 |
| carriageWeight | 0.025 kg |
| sealing | End seal standard; side scraper optional |
| accuracyGrades | Standard: running parallelism ~0.02 mm/300 mm; P grade: 0.01 mm/300 mm or better |
| moq | 50 pieces per size |
Application fit notes
Product: MGN12 Linear Rail (miniature stainless steel linear guide rail, MGN series, size 12)
Summary: MGN12 miniature linear guide rail in 9Cr18Mo martensitic stainless steel, part of the MGN 9 / 12 / 15 series with two-row Gothic-arch ball circuit. The MGN12C carriage delivers 3.7 kN dynamic load and 5.4 kN static load. Supplied with MGN-C (standard) or MGN-H (long) carriages for 3D printers, desktop CNC, medical devices, and humid environments where corrosion resistance is essential.
Specifications (from Dongfeng MGN series data)
Rail series: MGN 9 / 12 / 15 β this listing covers MGN12
Carriage types: MGN-C (standard flange) / MGN-H (long carriage)
Ball circuit: two-row Gothic arch, equal four-direction load capacity
Material (standard): 9Cr18Mo martensitic stainless steel; GCr15 chrome steel option for indoor cost-sensitive use
Hardness: HRC 54β58 (stainless) / 58β62 (chrome steel)
Dynamic load (MGN12C): 3.7 kN; static load (MGN12C): 5.4 kN
Max rail length: 1000 mm (splicing available)
Friction coefficient (MGN12C carriage): 0.002β0.004
Carriage weight (MGN12C): 0.025 kg
Sealing: end seal standard
Accuracy grades and inspection capability
Standard grade (Normal/High): running parallelism approx. 0.02 mm / 300 mm β suitable for the majority of desktop CNC and automation applications.
Precision grade (P): running parallelism 0.01 mm / 300 mm or better β specified for precision inspection equipment such as CMMs and vision systems.
Preload options: light or medium internal ball preload; medium preload is typically recommended for CNC applications.
Assembly workshop: CNC guide rail grinders with FANUC CNC system (convex/concave grinding, servo-driven micro feed); dedicated linear-guide testing center using level, optical straightener, inspection rod and dial gauge, autocollimator and laser interferometer for straightness and precision measurement. Every rail and carriage is assembled and tested according to its precision grade.
Data source for load and friction figures
Load ratings (3.7 kN dynamic / 5.4 kN static for MGN12C) and friction coefficient (0.002β0.004) are taken from the manufacturer's published MGN series datasheet. The friction coefficient is measured under clean, lubricated, low-speed linear motion conditions; actual values vary with load, speed, lubrication and sealing condition. A downloadable PDF of the MGN series datasheet (dimension tables, load ratings, accuracy tolerances and test conditions) is available on request β please request it via the inquiry form and we will send it with your quotation.
Certifications
Company-level certifications: CE and SGS (certificate images are displayed on our company certification page; certificate numbers and validity dates can be provided with the quotation β please request them in your inquiry). ISO 9001:2015 quality management system is applied in production. Note: we do not currently publish certificate numbers or third-party verification links online; scanned certificates are shared with buyers on request.
Installation, lubrication and service life
Installation: mount the rail on a machined, flat reference surface; tighten mounting bolts progressively from the center outward to the recommended torque to avoid distorting the rail; butt-joint reference marks must be aligned when splicing rails.
Lubrication: all MGN rails are pre-lubricated with high-quality grease at the factory. For typical indoor use, re-grease every 3β6 months or after roughly 100 km of travel; in dusty or high-cycle CNC environments, use side wiper seals and shorten the interval. Specialty greases are available on request.
Sealing: standard end seals; optional side scraper seals are recommended for dirty environments to keep debris out of the ball circuit and extend service intervals.
Service life: nominal life depends on load and stroke; calculate using the dynamic load rating (L = (C/P)^3 Γ 50 km for ball-type guides). We can run the life calculation for your application if you share load, stroke and cycle data.
Warranty framework
Every MGN12 rail and carriage is manufactured under strict quality controls and backed by a comprehensive warranty against manufacturing defects. Specific warranty duration and terms for your order are confirmed in the quotation, as they vary with rail length, carriage type and application.
Why buyers shortlist the MGN12 rail
Stainless steel as standard material β no additional plating needed for typical workshop humidity
Low friction coefficient (0.002β0.004) supports smooth manual sliding and low motor torque on stepper-driven axes
MOQ 50 pieces per size; sample sets of 5β10 pieces available for prototyping
Company backing (manufacturer level)
Xiamen Dongfeng Bearing Mechanical & Electrical Co., Ltd., founded 2014, manufactures linear motion bearings and guideways with high-precision automated grinding and CNC machining. Company certifications: CE, SGS. OEM/ODM and custom rail lengths available on request.
Before you order β please confirm with us
Exact pricing, current lead time, packaging details, and warranty terms for your specific rail length and carriage type β please include size, carriage type (C or H), length, and quantity in your inquiry.
FAQ
What sizes are covered? MGN 9 / 12 / 15; this product focuses on MGN12 rail with MGN-C or MGN-H carriages.
Which material should I choose? 9Cr18Mo stainless is standard for humid, medical, or food-adjacent environments; GCr15 chrome steel is a lower-cost option for indoor use.
What is the load rating at MGN12C? 3.7 kN dynamic / 5.4 kN static, per the manufacturer's published MGN series datasheet (available on request).
What accuracy can I expect? Standard grade: running parallelism approx. 0.02 mm/300 mm; P grade: 0.01 mm/300 mm or better.
How often does the rail need lubrication? Rails ship pre-greased; re-grease every 3β6 months or ~100 km of travel for typical indoor use, more often in dusty environments.
Can I get samples? Sample sets of 5β10 pieces are available; contact us with size and shipping address.
Send your rail size, carriage type, length, and quantity via the inquiry form for a quotation.
Why Buyers Choose Dongfeng Bearing
Xiamen Dongfeng Bearing Mechanical & Electrical Co., Ltd. β direct factory, 10+ years precision linear motion manufacturing
ISO 9001:2015, CE Declaration of Conformity, SGS test reports. Documentation available for EU and North American import requirements.
12 precision grinding and CNC machining lines; monthly output 500,000+ pieces across linear bearing and guideway series.
Germany, USA, Japan, South Korea, India, Southeast Asia and 40+ other countries. FOB Xiamen with DHL / FedEx / sea freight options.
Technical selection support before order. Dimensional drawing, material cert and inspection report with shipment. 12-month warranty on manufacturing defects.
Manufacturing Process & Quality Assurance
Precision Machining
CNC grinding centers hold ball raceway geometry to Β±0.003 mm. Induction hardening targets contact zones to HRC 58β62 without embrittling the full body.
CMM Dimensional Inspection
Every batch passes coordinate measuring machine (CMM) verification. Key dimensions β bore, OD, length, raceway radius β are logged against JIS / ISO tolerance bands.
Certification & QC
ISO 9001:2015 controls govern raw material intake, in-process check, and final inspection. SGS and CE documentation issued on request for each shipment.
Trade Shows & Partnerships
Regular exhibitor at Canton Fair and Hannover Messe. Established supply partnerships with automation integrators and machine tool OEMs across Europe and Asia.
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