A gantry crane is a type of overhead lifting equipment supported by two (or one, for semi gantry) freestanding legs that travel on ground rails or wheels, rather than being mounted on elevated runway beams like a traditional overhead crane. This makes it the preferred choice for outdoor yards, workshops without crane runways, and sites where ground-level installation is more practical than building steel structures for rail support.
The 20 Ton gantry crane sits at the crossover point of the gantry crane product range — it is heavy enough to demand a genuinely reinforced structure, yet still compact and cost-efficient enough to be built as a single girder crane in many applications. Depending on your span, duty cycle, and site conditions, a 20 ton load can be handled by a reinforced single girder gantry crane, a semi gantry crane, or a double girder gantry crane — which is why this capacity offers the widest structural choice in the whole gantry crane lineup.
Henan Dafang Heavy Machine Co., Ltd. has manufactured gantry cranes for 19 years since 2006. As a direct factory and 20 ton gantry crane manufacturer and supplier in China, we provide complete 20 ton gantry crane specifications, competitive 20 ton gantry crane price, and one-stop customization — from structural design and hoist selection to installation guidance and after-sales support.
20 Ton Gantry Crane Parts and Functions
Main Girder — The primary load-bearing structure, built as a box-type or I-beam section (single girder) or twin box girders (double girder). At 20 tons, the main girder is typically reinforced with thicker steel plate and additional diaphragms to control deflection and fatigue under repeated heavy loads.
Support Legs — Connect the main girder to the traveling mechanism. Rigid legs and flexible (hinged) legs are commonly paired to absorb thermal expansion and uneven ground loads without stressing the structure.
Electric Hoist / Trolley — At 20 tons, most cranes use a CD/MD electric wire rope hoist or a European-style low-headroom hoist trolley, selected for lifting speed, duty class, and headroom requirements.
Trolley Traveling Mechanism — Drives the hoist along the main girder, made up of a trolley frame, wheels and a geared motor, extending the working range across the full span.
Crane Traveling Mechanism — Wheel sets, drive motors and brakes that move the whole gantry along ground rails, enabling coverage of long yards or production lines.
Electrical & Control System — Includes the control cabinet, cab or ground/remote control, plus safety interlocks. At this capacity, overload limiters, anti-collision devices and wind-speed alarms (for outdoor use) are strongly recommended.
20 Ton Gantry Crane Types
Dafang offers several structural types of 20 ton gantry cranes, each matched to a different combination of span, duty cycle and site condition. Below are the parameter ranges and best-fit applications for each type.
Ports and terminals needing wide-span, high-frequency lifting
Features
Rigid twin box-girder structure gives higher stiffness and stability over long spans
Better suited to frequent, heavy-duty operation (A6–A7) than single girder designs
A-type and U-type leg configurations offer different clearance and stability trade-offs — A-type is more compact, U-type gives a wider, more stable base for higher lifting heights
20 Ton Gantry Crane Specifications
Parameter Category
Technical Specification
Optional Range / Remarks
Load capacity
20 Ton
Other tonnage customization available
Work duty
A4–A7
Selected according to duty cycle and operating frequency
Span
12–35 m
Wider spans available on request (special design)
Lifting height
6–20 m
Extendable to 30 m for special applications
Lifting speed
0.5–10 m/min
Frequency-conversion type: adjustable
Trolley/crane running speed
15–35 m/min
Frequency control down to 2 m/min
Wheel diameter
Φ400–Φ600 mm
Alloy steel wheels (HB≥300) for A6 and above
Power source
380V±10%, 50Hz, three-phase four-wire
Custom voltage available (415V, 440V, 660V, 60Hz)
Control mode
Ground button / cab / remote control
Explosion-proof remote available for hazardous sites
Note: Prices are indicative and vary by span, lifting height, control configuration, certification requirements, and destination. Contact our team for a detailed quotation based on your working conditions.
Buying Guide: How to Choose the Right 20 Ton Gantry Crane
Choosing between single girder, semi gantry, and double girder configurations at the 20 ton capacity depends on several site-specific factors:
1. Span requirement
Under 20–25 m: a single girder or truss-type gantry crane is usually the most cost-effective choice.
Over 25 m: a double girder gantry crane provides better rigidity and less deflection under load.
2. Duty cycle and frequency of use
Occasional or medium-frequency lifting (A4–A5): single girder or semi gantry cranes are sufficient.
Continuous, heavy-duty operation (A6–A7), such as steel mills or ports: choose a double girder or rail-mounted design built for higher fatigue resistance.
3. Site layout and available structure
If one side of your workspace already has a suitable elevated wall or building beam, a semi gantry crane can save on one row of support legs and floor space.
Open yards with no existing structure typically call for a full gantry crane with two ground-mounted legs.
4. Indoor vs. outdoor use
Outdoor cranes should include wind-resistance design, anemometers, and rail clamps/anti-wind devices for safety in high wind zones.
Indoor cranes can prioritize headroom-saving hoist trolleys and simpler control setups.
5. Environmental and special conditions
Explosion-proof, corrosion-resistant, or extreme-temperature environments require special electrical components, coatings, and hoist types — specify these early in the inquiry.
6. Certification and destination market
Confirm whether your project requires CE, ISO, or other regional certification, as this affects design standards, documentation, and lead time.
If you're unsure which type fits your project, share your span, lifting height, duty requirement, and site photos with our engineering team — we will recommend the most suitable and cost-efficient configuration.
Customized 20 Ton Gantry Crane
Dafang Crane specializes in customized lifting solutions engineered to your exact operating conditions:
Lifting Capacity: 20 Ton (other tonnages available)
Span / Lifting Height: Fully customizable
Control Options: Pendant / Cab / Wireless remote
Hoist Type: Electric wire rope hoist, chain hoist, or explosion-proof hoist
Certification: CE, ISO, EAC, and other regional certifications available
Work Duty: A4–A7
Share your working demands with our team, and we will provide a tailored proposal covering structural design, hoist selection, and control configuration.
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