MGN12 Linear Rail

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 — 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 54–58 (stainless) / 58–62 (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): 0.002–0.004

• 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 — suitable for the majority of desktop CNC and automation applications.

• Precision grade (P): running parallelism 0.01 mm / 300 mm or better — 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 (0.002–0.004) 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 — 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 — 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 3–6 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 × 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 — no additional plating needed for typical workshop humidity

• Low friction coefficient (0.002–0.004) supports smooth manual sliding and low motor torque on stepper-driven axes

• MOQ 50 pieces per size; sample sets of 5–10 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 — please confirm with us

Exact pricing, current lead time, packaging details, and warranty terms for your specific rail length and carriage type — 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 3–6 months or ~100 km of travel for typical indoor use, more often in dusty environments.

• Can I get samples? Sample sets of 5–10 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.