Caldwell DURA-MOD DM30-4 Modular 4-Point Spreader Beam

The Caldwell DURA-MOD DM30-4 Modular Box Spreader Beam is a heavy-duty 4-point lifting solution engineered to improve load stability, distribute lifting forces evenly, and adapt to a wide range of lifting applications. With a rated capacity of 30 metric tons, this modular system provides a versatile alternative to traditional fixed spreader beams, allowing users to configure the frame to suit different load dimensions and lifting requirements.

Featuring a modular bolt-together design, the DM30-4 can be assembled in various square and rectangular configurations with spans ranging from 3 to 20 feet. This flexibility enables contractors, rigging professionals, and industrial operators to use a single spreader beam system across multiple projects, reducing equipment costs while increasing operational efficiency.

The 4-point lifting configuration helps maintain balanced load distribution, minimizes stress on lifting lugs and attachment points, and improves control during critical lifts. By maintaining proper sling geometry and reducing load distortion, the DM30-4 enhances safety and lifting performance when handling large, heavy, or irregularly shaped loads.

Designed for demanding industrial environments, the DURA-MOD DM30-4 is manufactured from high-strength steel and built to withstand repeated use in construction, manufacturing, energy, offshore, shipbuilding, infrastructure, and maintenance applications. Its knock-down construction allows for convenient transportation, storage, and assembly, making it an ideal choice for job sites where mobility and adaptability are essential.

• Large equipment skids
• Structural steel assemblies
• Process modules
• Tanks and vessels
• Offshore and marine components
• Aerospace and military structures
• Precast concrete elements

The box-frame arrangement distributes forces evenly across the load and helps maintain proper sling angles.

Modular Design

A major advantage of the DM30-4 is that it is built from interchangeable components:

• Corner fittings
• Spreader sections (1 ft., 2 ft., 4 ft., and 6 ft. modules)
• Bolt kits
• Shackles and slings (supplied separately)

These sections can be combined to create square or rectangular lifting frames ranging from 3 Ft. to 20 Ft. in span. One system can therefore handle many different lift configurations.

Why Riggers Use It

Traditional welded spreader frames are often:

• Large and difficult to transport
• Expensive to store
• Limited to a single span

The DM30-4 solves these issues because it can be disassembled into smaller pieces for shipping and storage and then reassembled at the jobsite. Caldwell refers to this as a knock-down design.

Capacity and Structural Design

The system is rated for 30 metric tons and is designed to comply with applicable ASME B30.20 and BTH-1 below-the-hook lifting device standards. Capacity depends on the selected span and configuration, so the beam's capacity-versus-span chart must be checked during lift planning.

Typical Lift Arrangement

A crane hook connects to a top shackle. From there:

1. Upper sling set connects to the spreader frame.
2. The DM30-4 frame keeps lifting points separated.
3. Lower slings connect to four lifting lugs on the load.
4. The load is lifted with balanced loading at four points.

This arrangement reduces compressive and bending forces that would otherwise be transferred into the load.

Engineering Advantages

• Improved load stability versus 2-point lifting.
• Better control of sling angles.
• Reduced risk of load distortion.
• Modular reconfiguration for different projects.
• Easier transportation and storage.
• Suitable for custom lifting geometries.

Component Weights (Typical DM30-4 System)

These modular sections are combined as needed to create the required frame dimensions.