Quick Method
To choose a crane outrigger pad size, first identify the maximum outrigger load, then divide that load by the allowable ground bearing pressure. The pad area should be larger than the calculated minimum area, with a safety factor for wet ground, uneven surfaces, dynamic load and site uncertainty.
Basic Outrigger Pad Sizing Formula
Example: if the maximum outrigger load is 20,000 kg and the allowable ground bearing pressure is 10,000 kg/m², the minimum theoretical pad area is 2.0 m². In real projects, engineers normally apply a safety factor and consider pad stiffness, soil condition and load eccentricity.
This guide is for preliminary selection and quotation. Final crane support plans should be confirmed by qualified site personnel or engineers.
Practical Crane Outrigger Pad Size Reference
| Crane / Equipment Class | Typical Pad Direction | Recommended Consideration | Notes |
|---|---|---|---|
| Small boom lifts / light equipment | Compact square or round pads | Focus on ground protection and slip resistance | HDPE is often sufficient. |
| Truck-mounted cranes | Medium square pads | Check outrigger load per leg and soil condition | Use thicker pads for repeated rental use. |
| Mobile cranes | Large square or round pads | Calculate outrigger load and required area | Often needs engineered sizing. |
| Heavy cranes / soft ground | Large heavy-duty pad system | Use site-specific calculation and safety factor | May require mats plus outrigger pads. |
| Uneven or wet soil | Larger area + thicker pad | Reduce ground pressure and bending risk | Ground improvement may still be needed. |
HDPE vs UHMWPE Outrigger Pads
| Material | Best For | Advantages | Selection Note |
|---|---|---|---|
| HDPE | General outrigger support and ground protection | Cost-effective, moisture resistant, easy to machine | Good for standard-duty pads and large quantity orders. |
| UHMWPE | Heavy-duty, high-impact or frequent-use pads | Higher impact toughness, better wear resistance, low absorption | Preferred where safety margin and service life matter more than lowest price. |
| Composite / layered system | Special engineered sites | Can combine stiffness and load spreading | Requires project-specific design. |
Common Sizing Mistakes
Using Crane Weight Only
Outrigger load per leg can be much higher than a simple share of total crane weight during lifting.
Ignoring Soil Condition
Wet clay, sand, fill ground or turf can fail even with a strong pad.
Choosing by Price Only
A smaller cheap pad may increase ground damage, downtime and safety risk.
Information Needed for a Custom Pad Quote
- Crane model or equipment type
- Maximum outrigger load or expected load per leg
- Ground condition and allowable bearing pressure if known
- Required pad shape: square, round or custom
- Target size and thickness if already specified
- Material preference: HDPE or UHMWPE
- Handle requirement: rope, steel handle or hand hole
- Quantity and destination port
Need Help Sizing HDPE or UHMWPE Outrigger Pads?
Send your crane model, maximum outrigger load and ground condition. JSLT Ground Mat can recommend pad material, thickness, size and machining options for your project.
Request Outrigger Pad QuoteFAQ
How do I choose the correct crane outrigger pad size?
Calculate the required pad area from maximum outrigger load and allowable ground bearing pressure, then apply a safety factor based on soil, load and site conditions.
Can HDPE pads be used for cranes?
Yes, HDPE pads are widely used for standard-duty crane and equipment support. For heavier or more demanding use, UHMWPE may be recommended.
Are round or square outrigger pads better?
Both can work. Square pads are easy to stack and align; round pads can be convenient for certain boom lifts and compact support points.
Can you machine custom pad sizes?
Yes. We can cut, drill, route, chamfer and machine HDPE or UHMWPE pads according to drawings or size requirements.