Dongfeng
MGN Series Stainless Steel Miniature Linear Guide
MGN Series stainless steel miniature linear guide with 9Cr18Mo martensitic stainless as standard material, Gothic-arch two-row ball circuit delivering 3.7 kN dynamic load at MGN12C. Designed for 3D printers, desktop CNC, medical devices, and humid environments where corrosion resistance is essential.
Key Features
- 9Cr18Mo martensitic stainless steel is the standard material — corrosion resistant for humid, medical, and food-grade environments
- Two-row Gothic-arch ball circuit with 3.7 kN dynamic load (MGN12C) and equal four-direction load capacity
- Friction coefficient 0.002–0.004 — enables smooth manual sliding and low motor torque on stepper-driven axes
- MOQ 50 pieces per size — accessible for small machine builders and maker-market applications
- Chrome steel (GCr15) option available for indoor cost-sensitive applications
- Stainless balls and retainer throughout for full corrosion resistance
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 15–20 working days
Performance Data
- 10+ years of linear motion component manufacturing — 50+ export markets served
- Hardness tested to HRC 58–62; dimensional tolerance held to JIS / ISO / DIN standard grade
- CE & SGS certified; ISO 9001:2015 quality management system in production
Utility record
| Rail Series | MGN 9 / 12 / 15 |
|---|---|
| Carriage Types | MGN-C (standard) / MGN-H (long) |
| Ball Circuit | Two-row Gothic arch |
| Material (standard) | 9Cr18Mo stainless steel |
| Hardness | HRC 54–58 (stainless) |
| Dynamic Load (MGN12C) | 3.7 kN |
| Static Load (MGN12C) | 5.4 kN |
| Max Rail Length | 1000 mm |
| Friction Coefficient | 0.002–0.004 |
| Weight (MGN12C) | 0.025 kg |
Application fit notes
User Pain Point + Solution + Data
3D printer builders, desktop laser engraver manufacturers, and DIY CNC hobbyists struggle with linear guides that rust in humid environments, corrode when exposed to resins or cleaning solvents, and are too expensive in small quantities. The MGN Series solves all three: the standard material is martensitic stainless steel (9Cr18Mo) with HRC 54–58 hardness — no additional plating needed for typical indoor and workshop humidity. The two-row Gothic-arch design delivers 3.7 kN dynamic load at MGN12C, and pricing is structured for small-quantity orders starting at MOQ 50 pieces.
Complete Specifications
| Parameter | Value |
|---|---|
| Rail Series | MGN 9 / 12 / 15 (stainless standard) |
| Carriage Types | MGN-C (standard flange) / MGN-H (long carriage, higher load) |
| Ball Circuit | Two-row Gothic arch |
| Material (standard) | 9Cr18Mo martensitic stainless steel |
| Material (option) | GCr15 chrome steel (lower cost, indoor use) |
| Hardness | HRC 54–58 (stainless) / 58–62 (chrome steel) |
| Dynamic Load (MGN12C) | 3.7 kN |
| Static Load (MGN12C) | 5.4 kN |
| Max Rail Length | 1000 mm (splice available) |
| Sealing | End seal standard |
| Weight (MGN12C carriage) | 0.025 kg |
Product Advantages
Stainless Steel as Standard
9Cr18Mo martensitic stainless is the default material, not an upgrade. This eliminates corrosion concerns for 3D printers in humid workshops, medical devices requiring wipe-down cleaning, and food packaging equipment subject to wash-down.
Corrosion ResistantGothic-Arch Equal Load
Two-row Gothic-arch geometry transmits equal load in radial and reverse-radial directions. The contact angle is optimized so that the carriage self-adjusts to maintain even ball pressure even under slight rail misalignment.
Equal 4-Direction LoadLow-Friction Operation
Reduced ball count versus four-row designs means lower friction torque. MGN12C carriage friction coefficient is 0.002–0.004, enabling smooth manual sliding and low motor torque requirements on battery-powered or stepper-driven axes.
Friction 0.002–0.004Hobby-Friendly MOQ
MOQ starts at 50 pieces per size — accessible for small machine builders and makers. Chrome steel option (GCr15) further reduces cost for purely indoor applications. Sample sets of 5–10 pieces available for prototyping.
MOQ 50 pcsEnterprise Strength
Xiamen Dongfeng Bearing Mechanical & Electrical Co., Ltd.Ltd. — established 2014, 10+ years in linear motion manufacturing. Our 5,000 m² facility operates 12 production lines with 200+ employees. The miniature guide cell produces MGN series at 40,000+ sets per month, serving both industrial OEMs and small machine builders.
Certifications: ISO 9001:2015, CE, SGS. Export markets: 50+ countries — strong presence in North America (USA, Canada), Europe (Germany, Netherlands, UK), and Asia-Pacific (Japan, South Korea, Australia). Partners: Supplying 3D printer manufacturers, desktop CNC builders, and medical device OEMs.
Pre-sales: Application sizing assistance, CAD models available. After-sales: 18-month warranty, responsive email/video technical support. Customer case: Supplied 15,000 MGN12C stainless sets to a North American 3D printer manufacturer over 2 years — 0.02% defect rate, zero warranty claims related to corrosion.
Manufacturing, Exhibition & Quality Controltrol
Production Process & Quality Assuranceance
Process: 9Cr18Mo stainless bar → turning → vacuum hardening (HRC 54–58) → surface grinding (Ra ≤0.4 µm) → Gothic-arch raceway profiling → ball circuit assembly with stainless balls → preload setting → 100% smoothness test → packaging. Stainless steel balls and retainers used throughout for full corrosion resistance.
Quality testing: Raceway profile measured on contour projector, running smoothness verified per piece, friction torque sampled per batch. Exhibitions: Participated in Maker Faire Shenzhen, TCT Asia (3D printing), and Formnext to understand the evolving needs of desktop and maker-market linear motion users.
FAQ
What is the MOQ for MGN stainless steel guides?
MOQ is 50 pieces per size and carriage type. Mixed MGN9/MGN12/MGN15 sizes accepted in one order with 50-piece minimum per SKU. Sample sets of 5–10 pieces available — contact us with your size and shipping address.
How long is the lead time and what shipping options are available?
In-stock MGN9–MGN15 sizes: 7–10 business days. Custom rail lengths: 15–25 business days. Express shipping (DHL/FedEx): 5–7 days worldwide. Sea freight for bulk: 25–35 days to Europe, 18–25 days to North America. FOB Xiamen.
How are MGN guides packaged?
Each rail-carriage set is individually anti-corrosion oiled and vacuum-sealed. Sets packed in foam-lined cartons (20 per carton for MGN9–12, 10 per carton for MGN15). Bulk export orders use wooden crates with moisture barrier.
What payment terms do you accept?
T/T (30% deposit, 70% before shipment) for standard orders. L/C at sight for orders above USD 20,000. PayPal accepted for sample orders under USD 2,000. Western Union for small orders on request.
Can I get samples for prototyping?
Yes. Sample sets of 5–10 pieces per size are available with buyer covering shipping. For production orders of 200+ pieces, sample cost is fully credited. Provide your required size, rail length, and carriage type (C or H).
Do you offer OEM branding and custom packaging for small machine builders?
Yes. Custom laser-engraved logo on carriage body available for 100+ piece orders. OEM branded packaging available for 300+ piece orders. We also offer custom rail lengths and pre-drilled mounting hole patterns for 500+ piece orders — share your drawing for quotation.
Request a Quote for MGN Stainless Guides
Send your rail size, carriage type, length, and quantity — we reply within one business day with pricing and lead time.
Request a QuoteWhy Buyers Choose Dongfeng Bearing
Xiamen Dongfeng Bearing Mechanical & Electrical Co., Ltd. — 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 ±0.003 mm. Induction hardening targets contact zones to HRC 58–62 without embrittling the full body.
CMM Dimensional Inspection
Every batch passes coordinate measuring machine (CMM) verification. Key dimensions — bore, OD, length, raceway radius — 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.
Customer Application Cases
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