Product Overview
The MGN7 linear rail is a 7mm-width miniature linear guide system engineered for high-precision, low-friction linear motion in compact and lightweight applications. Manufactured by Zhejiang Siqiang Bearing Co., Ltd (brand: SIQIANG), the MGN7 series delivers exceptional accuracy and smooth travel in a slender profile that fits where standard-size guides cannot.
The MGN7 system consists of a precision-ground rail and a recirculating ball carriage block. It is available in two carriage variants: MGN7C (standard-length block, L = 22.5 mm) and MGN7H (long block, L = 30.8 mm). The longer MGN7H carriage provides a higher dynamic load rating of 1.37 kN and greater moment resistance, making it the preferred choice when stiffness and rigidity are critical. Both variants share the same 7mm-wide rail, making them fully interchangeable on the same rail profile.
Available materials include carbon steel (standard) and stainless steel (corrosion-resistant option for cleanroom or high-humidity environments). Rail length is fully customizable to meet your application requirements. All SIQIANG MGN7 linear rails are manufactured under an ISO 9001 quality management system, with CNC-machined precision and full inspection before shipment.
MGN7 Specifications & Dimensions
MGN7 Linear Rail dimensional reference. All dimensions in mm. Refer to the parameter letters (H, W, B, C, L, WR, HR, D, P, E) in the tables below.
Table 1 - Block Dimensions (mm)
| Model No. | Assembly Dimensions | Dimensions of Block | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| H | H₁ | N | W | B | B₁ | C | L₁ | L | G | Mxl | H₂ | |
| MGN7C | 8 | 1.5 | 5 | 17 | 12 | 2.5 | 8 | 13.5 | 22.5 | - | M2×2.5 | 1.5 |
| MGN7H | 8 | 1.5 | 5 | 17 | 12 | 2.5 | 13 | 21.8 | 30.8 | - | M2×2.5 | 1.5 |
Table 2 - Rail Dimensions (mm)
|
Table 3 - Load Ratings, Moment Capacity & Weight
| Model No. | Load Rating | Static Rated Moment (N·m) | Weight | ||||
|---|---|---|---|---|---|---|---|
| Dynamic C (kN) | Static C₀ (kN) | MR | MP | MY | Block (kg) | Rail (kg/m) | |
| MGN7C | 0.98 | 1.24 | 4.70 | 2.84 | 2.84 | 0.010 | 0.22 |
| MGN7H | 1.37 | 1.96 | 7.64 | 4.80 | 4.80 | 0.015 | 0.22 |
Note: 1 kgf = 9.81 N | MR = Roll moment | MP = Pitch moment | MY = Yaw moment
MGN7C vs MGN7H: Which Should You Choose?
Both MGN7C and MGN7H use the identical 7mm rail and share all rail-side dimensions. The only difference lies in the carriage (block) length and the resulting load and moment capacity:
| Feature | MGN7C | MGN7H |
| Carriage Length (L) | 22.5 mm | 30.8 mm |
| Dynamic Load Rating (C) | 0.98 kN | 1.37 kN ↑ +40% |
| Static Load Rating (C₀) | 1.24 kN | 1.96 kN ↑ +58% |
| Roll Moment (MR) | 4.70 N·m | 7.64 N·m ↑ +63% |
| Carriage Weight | 0.010 kg | 0.015 kg |
| Typical Use Case | Space-critical, lightweight axes | High-rigidity, overhang loads |
Choose MGN7C when installation space is tight or when minimizing weight is the priority - common in camera sliders, small robotic joints, or lightweight 3D printer X-axis assemblies.
Choose MGN7H when the carriage experiences cantilevered or overhanging loads, or when you need additional moment resistance - for example, in the Y-axis of a CoreXY printer or in CNC engravers where the spindle creates eccentric loading.
Applications of MGN7 Linear Rail
Thanks to its compact 7mm rail width, ultra-low profile, and excellent load-to-size ratio, the MGN7 linear guide is widely deployed across a broad range of precision industries:
3D Printers
Widely used in CoreXY systems (Voron 0, Voron Trident, Bambu Lab-style builds) for X/Y/Z axes. The MGN7's low friction and high straightness ensure precise layer alignment and consistent print quality.
CNC Engraving Machines
Compact CNC routers and laser engravers use MGN7 rails on lighter-duty axes to achieve smooth, repeatable motion with minimal backlash at an economical cost.
Robotic Arms & Grippers
Used in small collaborative robot (cobot) linear joints and gripper slide mechanisms where space is constrained and smooth travel is essential.
Laboratory & Medical Instruments
The stainless steel version of the MGN7 is ideal for cleanroom-compatible analytical instruments, liquid dispensing systems, and diagnostic platforms requiring corrosion resistance.
Camera Sliders & Optical Equipment
Camera slider rigs, autofocus lens actuators, and optical bench positioning stages rely on the MGN7's whisper-quiet operation and precise straightness.
Semiconductor & Electronics Assembly
Pick-and-place machines, PCB inspection systems, and wafer-handling automation leverage MGN7 rails for their high repeatability and low-profile footprint.
Why Choose SIQIANG MGN7 Linear Rail?
ISO 9001 Certified Manufacturing
All MGN7 rails are produced under a certified quality management system with full dimensional inspection before shipment. Straightness tolerance is controlled to industry-standard levels.
200+ CNC Machines, 5M+ Units/Year
With a 25,333 ㎡ workshop equipped with 200 CNC machines including German-made machining centers, SIQIANG delivers consistent precision at scale.
Custom Length & Material Options
Standard rail lengths are available in stock. Custom lengths from 100 mm to 1,000 mm+ can be manufactured to order. Material options: carbon steel (standard) and stainless steel (corrosion-resistant).
Factory Direct - Competitive Pricing
As a direct manufacturer established in 2007 with export experience since 2009, SIQIANG eliminates middlemen to offer market-competitive pricing on both sample orders and high-volume contracts.
Global Export Experience
SIQIANG products are shipped regularly to Germany, Italy, South Korea, Japan, USA, Brazil, India, and 40+ other countries. Experienced in international logistics, documentation, and compliance requirements.
Custom Branding & OEM Packaging
SIQIANG supports branded box design and OEM labeling for distributors and system integrators. Minimum order quantities are negotiable depending on product specification.
Frequently Asked Questions
Q: What is the difference between MGN7C and MGN7H?
A: Both use the same 7mm-wide rail. The difference is in the carriage (block) length: MGN7C has a standard-length carriage (L = 22.5 mm, Dynamic Load = 0.98 kN), while MGN7H has a longer carriage (L = 30.8 mm, Dynamic Load = 1.37 kN). The MGN7H provides approximately 40% higher load capacity and 63% greater roll moment resistance, making it better suited for applications with eccentric or cantilevered loads.
Q: What lengths are available for MGN7 linear rail?
A: Yes. The MGN7 is one of the most widely used linear guides in desktop 3D printers, especially CoreXY designs such as the Voron 0.1, Voron 0.2, and various DIY platforms. Its 7mm compact width and light weight make it ideal for fast-moving toolhead axes. The MGN7C is typically used for lightweight single-carriage setups, while MGN7H is preferred for dual-carriage or heavier toolhead configurations.
Q: Is the MGN7 rail suitable for 3D printers?
A: Yes. The MGN7 is one of the most widely used linear guides in desktop 3D printers, especially CoreXY designs such as the Voron 0.1, Voron 0.2, and various DIY platforms. Its 7mm compact width and light weight make it ideal for fast-moving toolhead axes. The MGN7C is typically used for lightweight single-carriage setups, while MGN7H is preferred for dual-carriage or heavier toolhead configurations.
Q: What is the mounting bolt specification for MGN7 rail?
A: The MGN7 rail uses M2×6 mounting bolts with a bolt pitch (P) of 15 mm and a countersunk hole diameter of Ø1.2 mm. Ensure your mounting surface has M2-threaded holes at 15 mm intervals. The rail end distance (E) is 5 mm from the first and last hole to the rail end.
Q: Is a stainless steel version of MGN7 available?
A: Yes. SIQIANG offers MGN7 rails in both carbon steel (standard, ideal for dry or lightly lubricated environments) and stainless steel (for applications requiring corrosion resistance, such as food processing, medical, or high-humidity environments). Please specify your material requirement when submitting an inquiry.
Q: What is the weight of the MGN7 rail per meter?
A: The MGN7 rail weighs 0.22 kg/m. The carriage block weighs 0.010 kg (MGN7C) or 0.015 kg (MGN7H). This ultra-low mass makes the MGN7 an excellent choice for weight-sensitive motion systems.
Q: Can SIQIANG provide OEM or custom-branded MGN7 products?
A: Yes. SIQIANG supports OEM services including custom laser engraving on rail, branded packaging design, and relabeling for distributors and system integrators. Minimum order quantities apply. Please contact our sales team to discuss your specific OEM requirements.
Get a Quote for MGN7 Linear Rail
Tell us your required carriage type (MGN7C or MGN7H), rail length, quantity, and material - we'll respond within 24 hours with a competitive factory-direct price.
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