---
title: "What Size Factory Crane Fits a 50-Ton Workshop?"
url: https://yzcranes.com/what-size-factory-crane-fits-a-50-ton-workshop/
date: 2026-08-24
modified: 2026-08-22
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description: "A 50-ton production workshop should use a double-girder overhead crane with a 50-ton rated lifting capacity. But how do you right-size a factory crane for a 50-ton workshop without overspending..."
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# What Size Factory Crane Fits a 50-Ton Workshop?

A 50-ton production workshop should use a double-girder overhead crane with a 50-ton rated lifting capacity. But how do you right-size a factory crane for a 50-ton workshop without overspending on capacity you will never use or underspecifying a machine that breaks down within two years? The span depends on building column spacing, which is generally 16.5–31.5 m. The lifting height is based on the tallest workpiece plus below-the-hook device dimensions plus safety clearance, usually 12–18 m. The duty group is recommended at A5–A6. Overhead cranes are the main choice for workshops because they cover nearly the entire floor area and enable precise lifting when paired with electric wire rope hoists. For very long workpieces or cross-bay transport, gantry cranes offer a viable alternative.

## 1. What Is a Factory Crane?

A factory crane is a lifting device used inside industrial buildings—machinery manufacturing, metallurgy, automotive, and energy facilities all rely on them. The crane handles workpiece transport, equipment maintenance, and material transfer across the production floor. Unlike port or construction-site cranes, factory cranes usually sit indoors and run on rails mounted to building brackets or column corbels. Fixed operating zones, high utilization rates, and strict positioning accuracy needs define their daily work. A well-chosen workshop crane can cover over 90% of the floor area, making it an indispensable piece of equipment in the production flow.

The core parameters of a factory crane include rated lifting capacity, span, lifting height, duty group, and travel speed. Rated capacity sets the maximum workpiece weight. Span sets the horizontal coverage. Lifting height sets the vertical hoisting space. Duty group reflects how often the crane runs and under what load conditions. These parameters are linked, and production managers must determine them together with the production process, building structure, and future capacity plans. Joint planning avoids both underspecification that causes frequent repairs and overspecification that wastes capital.

## 2. Factory Crane Types: Overhead, Gantry, and Jib

### 2.1 Overhead Crane

The overhead crane is the most common type in factory workshops. A main girder, end carriages, a hoisting mechanism, and a travel mechanism make up its core structure. The crane runs along rails on the column corbels on both sides of the building, while the trolley traverses the main girder. The arrangement allows three-dimensional material handling within a rectangular area. Overhead cranes come in single-girder and double-girder configurations. Single-girder cranes handle 1–20 t light-duty work with simple structures and low cost. Double-girder cranes handle 5–500 t medium-to-heavy-duty work and offer greater lifting heights, higher duty groups, and easier integration of maintenance platforms and auxiliary hooks.

European-style single-girder overhead cranes use modular design. They weigh 20%–30% less than traditional QD-type cranes, with lower wheel loads and reduced structural requirements on the building. Covering capacities of 0.5–20 t, these cranes are the preferred choice for small-to-medium-tonnage workshops. The Yuzhong European-style single-girder overhead crane comes standard with a European electric wire rope hoist and C-type gearbox, covers capacities of 0.5–20 t, runs smoothly, and keeps noise below 75 dB.

### 2.2 Gantry Crane

A gantry crane's main girder sits on legs that run on ground-level rails, eliminating the need for building corbels and load-bearing girders. Gantry cranes work well for outdoor storage yards, warehouses, and pre-assembly areas outside the workshop. A semi-gantry crane has one leg on a ground rail and the other on a building corbel—an arrangement that suits indoor–outdoor joint operations. The MG-series general-purpose gantry crane offers rated capacities of 5–500 t and spans of 10–40 m, fitting various work-area widths.

In factory settings, gantry cranes mainly serve steel storage yards, finished-goods dispatch areas, and outdoor assembly sites. When workshop height is limited or corbel load capacity is low, a gantry crane can replace an overhead crane. The trade-off is floor space occupation and embedded rail foundations that require early planning.

### 2.3 Jib Crane

A jib crane (or slewing jib crane) has a vertical column and a rotatable boom. Capacities range from 0.25–5 t with a boom length of 3–10 m, and rotation spans 180–360 degrees manually or electrically. Jib cranes work well for workstation-level fixed-point tasks—machine loading/unloading, inspection stations, and die-change points. Precise positioning, simple operation, and low cost make them a natural supplement to overhead cranes. The jib crane cuts down long-travel bridge movements at specific workstations and improves overall shop-floor efficiency.

### Comparison of Applicable Scenarios

| Parameter | Overhead Crane | Gantry Crane | Jib Crane |
| --------- | -------------- | ------------ | --------- |
| Capacity range | 0.5–500 t | 5–500 t | 0.25–5 t |
| Coverage | Rectangular area, full workshop | Areas along both sides of rails | Circular local area |
| Building requirement | Corbels and load-bearing girders required | Ground rail foundation required | Floor anchoring or wall mounting only |
| Duty frequency | High (A5–A7) | Medium–high (A4–A6) | Low–medium (A2–A4) |
| Equipment investment (50 t class) | RMB 600,000–1,200,000 | RMB 500,000–1,000,000 | Not applicable |
| Typical application | Main production workshop | Outdoor yard / dispatch area | Workstation fixed-point tasks |
| Positioning accuracy | ±5–15 mm | ±10–20 mm | ±3–10 mm |

## 3. Lifting Capacity Calculation

Determining the rated lifting capacity is the first and most critical step in crane selection. The rated capacity is not simply the heaviest workpiece; you should calculate it with this formula:

**Rated lifting capacity ≥ Maximum workpiece weight + Below-the-hook device weight + Safety margin**

The below-the-hook device weight includes the hook, wire rope, lifting beam, electromagnet, or vacuum lifter. The safety margin usually runs 10%–20% of the maximum workpiece weight, depending on several factors:

- **Duty frequency**: Frequent starting and braking calls for a larger safety margin. For duty group A6 and above, we recommend 20%.
- **Load characteristics**: When handling liquid metal, flammable or explosive materials, or precision equipment, raise the safety margin to 25% or more.
- **Future expansion**: If the workshop plans to handle heavier workpieces within 3–5 years, reserve capacity for a tonnage upgrade.

For a 50 t workshop, consider this example. The heaviest workpiece weighs 40 t. The custom below-the-hook device weighs 3 t. The safety margin is 20%, or 8 t. The required capacity is 40 + 3 + 8 = 51 t. You should select a 50 t rated-capacity crane—the closest standard tonnage. In practice, the 40 t workpiece sits well below the rated value, so the safety margin is adequate. If the heaviest workpiece reaches 45 t, you would need a 63 t or 75 t class crane.

### Multi-Hook Configurations

Multi-hook setups are common in heavy-duty workshops. A 50 t main hook handles overall heavy-workpiece lifts, while a 10–16 t auxiliary hook supports light-duty tasks and workpiece turning. Coordinated main and auxiliary hook operations can perform complex moves such as workpiece flipping and attitude adjustment. The auxiliary hook's hoisting speed runs 30%–50% faster than the main hook to improve light-duty efficiency. The LHB explosion-proof double-girder overhead crane works in chemical and paint workshops with explosion-proof needs, providing the same class of lifting capacity.

## 4. Building Structure Considerations

Crane installation places clear requirements on the building structure. A structural assessment must come before selection, focusing on three main aspects:

### 4.1 Column Spacing and Span

Building column spacing is the longitudinal distance between adjacent columns, usually measuring 6 m, 9 m, or 12 m. The crane span is the distance between the centerlines of the two rails, generally 1–1.5 m less than the building span. For example, with a 24 m building span, the crane span works out to 22.5 m. Column spacing affects long-travel operation and buffer placement. A 12 m column spacing reduces impact when crane wheels pass rail joints compared to 6 m spacing, but requires higher rail installation precision.

### 4.2 Roof Load Capacity and Corbel Design

The wheel loads of an overhead crane transfer through the long-travel rails to the column corbels, then pass through the columns to the foundation. Wheel load size depends on the crane's self-weight, rated capacity, and trolley position. The maximum wheel load of a 50 t double-girder overhead crane usually reaches 200–350 kN. Corbels and columns must handle the maximum wheel load. If existing corbels lack capacity, structural reinforcement or a lighter European-style crane may be necessary. European-style single-girder designs can cut wheel loads by 15%–25% through optimized girder cross-sections and high-strength materials.

### 4.3 Rail Foundations and Electrical Provisions

Long-travel rails use QU70 or QU80 steel rails fixed to rail beams on top of the corbels. Reserve expansion gaps of 2–4 mm at rail joints and use welded or fishplate connections. During building design, provide brackets for conductor bar installation beside the corbels, and reserve maintenance platforms and access passages at the ends. We recommend safe conductor bars for power supply because they are safer and need less maintenance than angle-iron conductors. If the building is already complete without crane provisions, a structural engineer must review the load. Corbels may need reinforcement, steel girders may need to be added, or a free-standing gantry crane may be the better path forward.

## 5. Span and Lifting Height Planning

### Span Selection

Standardize the crane span as much as possible while meeting process needs. Standard spans are 10.5 m, 13.5 m, 16.5 m, 19.5 m, 22.5 m, 25.5 m, 28.5 m, and 31.5 m. Non-standard spans add 10%–20% to manufacturing cost and lead time. When selecting a span, make sure the crane covers all workstations and leaves maintenance access on both sides—at least 500 mm each.

### Lifting Height

Lifting height runs from the lowest working position of the hook to its highest position. You must consider this dimension chain:

- Height of the tallest workpiece
- Height of the below-the-hook device (hook, lifting beam, or electromagnet)
- Safety clearance from the workpiece bottom to the floor, usually at least 300 mm
- Safety clearance from the upper hook limit to the main girder underside, generally at least 200 mm

For a 50 t workshop example, consider these figures. The tallest workpiece is 4 m high. The below-the-hook device is 1.5 m high. Floor safety clearance is 0.5 m. Upper safety clearance is 0.3 m. Total required lifting height is about 6.3 m. Taller tooling or workpieces may be added down the road, though, so we recommend a lifting height of 12 m or more. Standard lifting heights are 6 m, 9 m, 12 m, 16 m, 18 m, and 24 m.

### Travel Speeds

The travel speeds of each mechanism directly affect efficiency. For a 50 t double-girder overhead crane, speeds break down like this: The main hoist runs at 2–6 m/min for heavy loads. The auxiliary hoist runs at 5–12 m/min. Trolley cross-travel runs at 20–40 m/min. Long-travel runs at 40–80 m/min. Variable-frequency drives (VFD) enable 0–100% stepless speed control. Low-speed positioning accuracy reaches ±2 mm, which suits precision assembly. The Yuzhong double-girder overhead crane uses VFD control and Siemens motors, ensuring smooth hoisting and travel with precise positioning.

## 6. Budget Breakdown: Equipment, Installation, Transport, and Inspection

The total investment in a factory crane covers more than just the equipment price tag. Transport, installation, acceptance testing, and ongoing maintenance all factor into the real number. Consider a 50 t, 22.5 m span, 12 m lifting height, A5 duty group double-girder overhead crane as an example. The budget breaks down as follows:

| Cost Item | Amount Range (RMB 10,000) | Share | Notes |
| --------- | ------------------------- | ----- | ----- |
| Equipment | 55–85 | 55%–60% | Main girder, end carriages, trolley, electric hoist, electrical system |
| Transport | 3–8 | 3%–5% | Heavy or oversized cargo; distance and road conditions significantly affect cost |
| Installation & commissioning | 12–22 | 12%–15% | Lifting, assembly, commissioning, load testing |
| Rails & conductor bars | 8–15 | 8%–10% | Steel rails, rail beams, safe conductor bars, brackets |
| Acceptance inspection | 1–3 | 1%–2% | Inspection by special-equipment inspection authority |
| Spare parts & special tools | 2–5 | 2%–3% | Wear-part spares, dedicated maintenance tools |
| First-year maintenance | 2–4 | 2%–3% | Scheduled inspections, lubrication, adjustments |
| **Total** | **83–142** | **100%** | Excluding building structural reinforcement costs |

### Annual Operating Costs

After the crane enters service, fixed annual operating costs include several items. The annual inspection fee is RMB 5,000–15,000, charged by the special-equipment inspection authority. Routine maintenance costs RMB 20,000–50,000, covering lubrication, wear-part replacement, and periodic checks. Operator wages depend on region, with 1–2 persons per shift per crane. Electricity costs add up too—a 50 t crane at full load draws about 30–50 kW, and at 2,000 operating hours per year, annual electricity costs about RMB 30,000–60,000.

### Cost Optimization Recommendations

- **Choose standardized spans and lifting heights**: Non-standard parameters add 10%–20% to manufacturing cost and extend lead times.
- **Specify the right duty group**: A5 is about 15%–20% cheaper than A7. Unless the crane runs continuously at full load, you do not need to pursue a higher rating blindly.
- **Coordinate building construction**: Determine crane parameters during the building design phase so corbels and rail foundations can be built in parallel, avoiding costly retrofits.
- **Focus on lifecycle cost**: High-quality components such as C-type gearboxes and SKF bearings may raise the purchase price by 5%–10%, but they can cut 10-year maintenance costs by over 20%.

## Why Choose Yuzhong

When a 50-ton workshop demands a crane that handles heavy, continuous lifts without skipping a beat, Yuzhong brings floor-level experience that goes back nearly half a century. Founded in 1978, Henan Yuzhong Crane Group has spent 48 years building overhead and gantry cranes that perform in real factory conditions, not just on specification sheets.

For medium-tonnage workshops, the European-style single-girder overhead crane covers 0.5–20 t with a modular design that weighs 20%–30% less than traditional QD-type models. The lower wheel loads mean less stress on the building structure—a genuine advantage for both new construction and older-workshop retrofits where corbel capacity may be marginal. For heavier demands, the MG-series gantry cranes span 5–500 t. Every unit comes standard with Siemens motors and SKF bearings.

Yuzhong commits to delivering engineering drawings within 24 hours of inquiry, and the engineering team provides building structural assessments and selection support before any purchase order is signed. ISO 9001/14001/45001, FEM, ASME, and CE certifications back every product. On-site installation guidance is available. Think of it this way: a crane is a 20-year investment, and the manufacturer behind it matters just as much as the steel in the girder.

## FAQ

### Crane Types and Pricing

**What type of crane is used in factory workshops?**
Most machining and assembly workshops use overhead cranes. Single-girder cranes suit 1–20 t light-duty work. Double-girder cranes handle 5–500 t medium-to-heavy-duty tasks. Outdoor material yards and dispatch areas use gantry cranes. Workstations can use 0.25–5 t jib cranes as supplements. Chemical workshops with explosion-proof needs should use explosion-proof double-girder overhead cranes.

**How much does a 50-ton overhead crane cost?**
For a standard 50 t double-girder overhead crane with a 22.5 m span and 12 m lifting height, the equipment price is about RMB 550,000–850,000. The total investment, including transport, installation, rails, and acceptance, is about RMB 830,000–1,420,000. The exact price depends on span, lifting height, duty group, component brands, and corrosion-protection needs.

### Selection Process and Comparisons

**How do you select a workshop crane?**
Follow this process. First, determine the rated capacity by adding the heaviest workpiece weight, below-the-hook device weight, and safety factor. Second, determine the span based on building column spacing. Third, calculate the lifting height based on the tallest workpiece and device dimensions. Fourth, determine the duty group based on operating frequency. A4–A6 is the common range. Fifth, check whether the building structure can handle the wheel loads. Finally, choose a standard or custom configuration based on budget.

**What is the difference between European-style cranes and traditional QD-type cranes?**
European-style cranes use modular design and optimized girder cross-sections. They weigh 20%–30% less than traditional QD-type cranes, with 15%–25% lower wheel loads. They place fewer structural demands on the building and consume less energy. European-style cranes usually come standard with VFD control, giving smoother operation and higher positioning accuracy. Their purchase price is 10%–20% higher than equivalent-capacity QD-type cranes, but we recommend European-style designs for new buildings and older workshops with structural limits.