Round Duct Lock Seam Machine — New | BLKMA, Ma'anshan, China

The BLKMA Round Duct Lock Seam Machine is an automatic machine used for closing lock seams on 0.4–1.2mm sheet metal round ducts, specifically designed to strengthen the button lock and particularly suited to producing large volumes of round ducts. The machine combines with a 3-roller forming machine and round duct lock forming machine to produce ducts with standard appearance and reliable quality, and is easy to install with high efficiency.

BLKMA develops each machine in its round duct processing range strictly according to the corresponding requirements of rolling, locking, seaming, leveling, and beading — meaning every stage of round duct processing has a dedicated machine designed to maximize efficiency at that specific step, rather than relying on a single compromise machine to handle multiple functions poorly.

Why Choose This Round Duct Lock Seam Machine?

A key advantage of this machine is its energy efficiency — the motor draws just 0.75kW of power, significantly lower than many comparable seaming machines, reducing operating costs for high-volume production runs. The operating method is simple and easy to learn, saving time and training costs for fabricators bringing new operators onto the line.

All mechanical parts are sourced from high-quality brand suppliers, reflecting BLKMA's stated commitment to product stability and quality. For complete round duct end forming and connection, this machine can be paired with a dedicated flange rolling machine to create precise flanges for secure duct joining — extending the production line's capability beyond just seam closing.

Machine Specifications

Model YJB-1250

• Plate thickness: 0.4–1.2mm
• Machining length: 1250mm
• Weight: 350kg
• Power: 0.75kW
• Dimensions: 2250×610×1450mm

Condition Available: New

Basic Configuration

• One motor
• One electronic box
• One foot switch
• One electric control system

Key Features

• Energy-efficient — motor power just 0.75kW
• Reinforces button lock for particularly strong seam closure
• Simple, easy-to-learn operation
• High-quality brand components throughout for stability and reliability
• Suited to high-volume round duct production
• Compatible with complementary 3-roller forming and lock forming machines

Applications

• Round duct lock seam closing for HVAC ductwork
• High-volume round duct production lines
• General ventilation duct fabrication

Who This Machine Is For

• HVAC duct manufacturers and fabricators
• High-volume round duct production facilities
• Ventilation equipment suppliers requiring reliable, energy-efficient seaming equipment

Frequently Asked Questions

What does this machine actually do?
It closes and reinforces the lock seam on round HVAC ducts made from 0.4–1.2mm sheet metal, strengthening the button lock for reliable, consistent duct quality.

How energy efficient is this machine?
The motor draws just 0.75kW of power, making it significantly more energy-efficient than many comparable seaming machines — a genuine cost saving for high-volume production.

What other machines does this work alongside?
This machine is typically combined with a 3-roller forming machine and round duct lock forming machine to produce a complete, standard-appearance duct. A dedicated flange rolling machine can also be added for duct end forming and connection.

Is this machine easy to operate?
Yes. The operating method is described as simple and easy to learn, reducing training time and operational costs.

What's the maximum machining length?
The machine handles a machining length of 1250mm.

Is financing or staged payment available?
Yes. A deposit secures your order and begins production, with the remaining balance due only once your machine has been built, inspected, and is ready to ship.

Should I buy new or used?
This model is available new, from a manufacturer with duct machinery experience since 1994.