Single Girder Overhead Crane: What It Is and How to Choose the Right One

If you're evaluating overhead lifting equipment for your facility, the single girder overhead crane is often the first option worth examining. It's cost-effective, easy to install, and well-suited for light to medium-duty lifting tasks. But is it the right crane for your operation? This guide breaks down everything a procurement team needs to know — without the technical jargon.

By the end of this article, you'll understand how this crane works, where it excels, and what to watch out for before signing a purchase order.

What Is a Single Girder Overhead Crane? Basic Structure and Design

A single girder overhead crane uses one main horizontal beam (the girder) to support the hoist and trolley. The girder runs along two end trucks, which travel on runway rails mounted to the building structure or freestanding columns.

This is the key difference from a double girder crane, which uses two parallel beams. The single-beam design keeps the crane lighter and more compact, making it ideal for facilities with lower ceiling heights or tighter budgets.

How It Moves and Lifts

The hoist — which does the actual lifting — hangs below the girder on an under-running trolley. This is called an "underhung" configuration. The trolley moves side to side along the bottom flange of the girder, while the entire bridge travels forward and backward along the runway.

This combination gives operators full coverage of the work area beneath the crane.

Capacity and Span Range

Single girder cranes typically handle loads from 0.5 tons up to 20 tons, with spans ranging from 5 meters to 28 meters. Some manufacturers extend this to 32 meters under specific engineering conditions.

Parameter

Typical Range

Lifting Capacity

0.5t – 20t

Span

5m – 32m

Lift Height

3m – 30m

Duty Class (ISO 4301)

A3 – A5

Source: ISO 4301-1 Crane Classification Standard

Where Single Girder Cranes Are Most Commonly Used Light to Medium Industrial Facilities

Single girder cranes are the go-to choice for workshops, warehouses, assembly lines, and maintenance bays. Any facility that needs to move loads regularly but doesn't require heavy-duty cycles will find this crane a practical fit.

Automotive repair shops, small metal fabrication plants, and food processing facilities are typical users. The crane handles repetitive but not extreme workloads.

Key Selection Criteria: What Procurement Teams Must Check Load Capacity and Duty Cycle

First, define your maximum lift weight — and then add a safety margin of at least 25%. A crane running at its rated limit constantly will wear out faster and create compliance risks.

Hoist Type: Electric Chain vs. Wire Rope

For loads under 5 tons, an electric chain hoist is the standard and cost-effective choice. For heavier loads or higher lift heights, a wire rope hoist is more durable and better suited for sustained use.

Hoist Type

Best For

Lift Speed

Maintenance

Electric Chain Hoist

≤5t, short cycle

2–8 m/min

Low

Wire Rope Hoist

5t–20t, frequent use

5–20 m/min

Moderate

Control System Options

Modern single girder cranes typically offer:

• Pendant control (wired remote hanging from crane)
• Radio remote control (wireless, improves operator safety)
• Cabin control (for large spans or complex operations)

Radio remote is increasingly the standard for new installations, as it removes the operator from the load path and improves visibility.

Compliance and Safety Standards What Certifications to Require

When sourcing a single girder overhead crane, ensure the product complies with:

• FEM 1.001 – European crane design standard
• ISO 4301 – Crane classification
• CE Marking – Mandatory for EU markets (Machinery Directive 2006/42/EC)
• ASME B30.2 – For North American markets

Always request the supplier's test certificate, load test report, and CE declaration of conformity before accepting delivery.

Structural Inspection Before Purchase

Ask for a finite element analysis (FEA) report on the girder if purchasing for spans over 18 meters. This confirms that the beam meets deflection and fatigue limits under your operating conditions — not just standard lab conditions.

Single Girder vs. Double Girder: A Direct Comparison

Factor

Single Girder

Double Girder

Capacity

Up to 20t

Up to 500t+

Cost

Lower (20–40% savings)

Higher

Headroom Required

Less

More

Hook Approach

Lower (better for tight spaces)

Higher

Maintenance Access

Harder (no walkway)

Easier (with walkway)

Duty Cycle

A3–A5

A5–A8

Best Application

Light/medium duty

Heavy/continuous duty

If your load requirements stay under 15 tons and duty cycles are moderate, a single girder crane almost always delivers better value.

Summary and Buying Recommendations

The single girder overhead crane is a proven, reliable solution for light to medium industrial lifting. It offers real cost advantages, a compact footprint, and straightforward installation — all without sacrificing the essential performance most facilities need.

If you're still uncertain, request a site assessment from a qualified crane supplier. Most reputable manufacturers offer this as a free pre-sales service.

FAQ

Q1: What is the maximum load a single girder overhead crane can lift?

Most standard single girder cranes are rated up to 20 tons. Some custom-engineered models extend to 32 tons, but beyond that, a double girder crane is the appropriate choice. The rated capacity is determined by the girder strength, hoist rating, and runway design working together. Always verify that all three components share the same rated capacity — mismatched specs are a common procurement mistake.

Q2: How much headroom does a single girder crane require?

The minimum clear height needed depends on the crane model and hoist type, but a general rule is at least 1.5 to 2 meters above your maximum hook height. 

Q3: How often does a single girder overhead crane need maintenance?

Under normal operating conditions (Duty Class A3–A4), a single girder crane should receive a formal inspection every 12 months, with basic checks on hooks, brakes, and controls every 3 months. Wire rope should be inspected monthly for wear and deformation. Following the manufacturer's maintenance schedule and keeping service records is also required for CE compliance in most markets.

Q4: Can a single girder crane be installed in an existing building?

Yes, and this is one of its key advantages. The lighter weight of a single girder crane places less load on the building structure compared to a double girder system. 

Q5: What is the typical service life of a single girder overhead crane?

With proper maintenance, a well-built single girder crane can operate reliably for 20 to 25 years. Service life depends heavily on how closely the crane is operated within its duty class rating. Cranes that are regularly overloaded or run beyond their rated cycle frequency will experience accelerated wear on the hoist, girder, and end trucks. Keeping a maintenance log and scheduling annual professional inspections significantly extends operational life.