Single Girder vs. Double Girder Overhead Crane: How to Choose the Right One?

When it comes to optimizing material handling in your warehouse or factory, choosing the right overhead crane is a critical decision. The most common debate is: Should you invest in a single girder or a double girder overhead crane?

While both serve the same purpose—lifting and moving heavy loads—they differ significantly in construction, cost, and performance. In this guide, we will break down the key differences to help you make an informed choice.

1. What is a Single Girder Overhead Crane?

A single girder crane consists of one bridge beam supported by two end trucks. The trolley and hoist run on the bottom flange of the bridge girder.

• Best for: Light to moderate loads (typically 1 to 20 tons).
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• Pros: Lower cost, faster installation, and lighter deadweight.
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• Cons: Limited lifting height and lower duty group.

2. What is a Double Girder Overhead Crane?

A double girder crane features two bridge beams. The trolley and hoist travel on rails usually mounted to the top of the bridge girders.

• Best for: Heavy-duty applications (20 to 500+ tons).
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• Pros: Better lifting height, higher duty cycles (A5-A8), and extremely durable.
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• Cons: Higher initial investment and heavier structure.

3. Key Comparison Table

To give you a clearer view, here is a technical comparison:

Feature	Single Girder Crane	Double Girder Crane
Load Capacity	Typically up to 20 Tons	Up to 500 Tons or more
Span Range	Short to Medium	Long spans (over 30m)
Lifting Height	Limited (Hoist is below beam)	Higher (Hook can travel between beams)
Duty Group	A3 - A4	A5 - A8 (Heavy Duty)
Installation Cost	Lower	Higher
Maintenance	Easier / Simpler	More complex but durable

4. Critical Factors to Consider

A. Headroom and Lifting Height

If your workshop has low ceilings but you need maximum hook height, a double girder crane is often the better choice. Because the hoist is placed between or on top of the girders, you gain extra vertical space compared to a single girder design where the hoist hangs below.

B. Duty Cycle (Frequency of Use)

How often will the crane be running? If you are moving loads occasionally throughout the shift, a single girder crane is sufficient. However, for continuous, high-speed operations like in steel mills or heavy manufacturing, the double girder crane is built to withstand the wear and tear.

C. Budget vs. Long-term Value

A single girder crane is more budget-friendly initially. However, if your business plans to scale up or handle heavier materials in the future, investing in a double girder crane now can save you the cost of a complete system replacement later.

5. Which One Should You Choose?

Choose a Single Girder Crane if: Your loads are under 15 tons, your span is modest, and you are looking for a cost-effective solution for standard warehousing.

Choose a Double Girder Crane if: You need to lift over 20 tons, require high-speed operation, need maximum lifting height, or work in harsh industrial environments.

Conclusion

Selecting the right overhead crane involves balancing your current needs with your future growth. At MK hoist, we specialize in providing custom-engineered crane solutions tailored to your specific facility requirements.

Need a Professional Recommendation? Contact MKhoist Experts Today for a free consultation and quote on your next overhead crane project.