In This Guide
Seam Locking: Closing the Pittsburgh Connection
After the Pittsburgh lock profile is formed on the lockformer and the duct is assembled, the final step is seam locking — crimping the male and female profiles together to create a tight, permanent connection. A good seam locker ensures air-tight duct connections that won't separate under pressure.
Preda offers three seam locker configurations for different production volumes and shop sizes.
Quick Answer
Most shops start with the Portable Electric Seam Locker — it's affordable, movable, and handles standard Pittsburgh seams. High-volume shops producing 100+ ducts/day upgrade to the CNC Hydraulic Seam Locker HF-1550 for faster, more consistent locking. The Pittsburgh Seam Locker L12 is a dedicated floor model for medium-volume production.
Three Seam Locker Options
| Feature | Portable Electric | Pittsburgh L12 | CNC Hydraulic HF-1550 |
|---|---|---|---|
| Portability | Portable (handheld/wheeled) | Fixed floor model | Fixed floor model |
| Automation | Manual feed | Semi-auto | CNC automatic |
| Max Length | Unlimited (portable) | 1500mm | 1550mm |
| Max Thickness | 1.2mm | 1.2mm | 1.5mm |
| Speed (seams/hour) | 60–100 | 100–150 | 200–300 |
| Best For | Small shops, job sites | Medium volume | High-volume factories |
Portable Electric Seam Locker: Affordable and Movable
The Portable Electric Seam Locker is a handheld or wheeled portable tool that locks Pittsburgh seams on the spot. It's the most affordable option and can be used anywhere — on the shop floor or at the job site for field modifications.
- Portable: Move to the duct, not the duct to the machine — saves material handling
- Affordable: Lowest cost entry point for seam locking
- Unlimited length: Can lock seams of any length — no machine width limitation
- Job site ready: Perfect for on-site duct modifications and repairs
- Easy to use: Simple operation — minimal training required
View Portable Electric Seam Locker →
Pittsburgh Seam Locker L12: Dedicated Floor Model
The Pittsburgh Seam Locker L12 is a dedicated floor-mounted machine for medium-volume production. It features a fixed throat depth and powered rollers for consistent seam locking. More productive than portable tools for shop-based production.
View Pittsburgh Seam Locker L12 →
CNC Hydraulic Seam Locker HF-1550: High-Volume Production
The CNC Hydraulic Seam Locker HF-1550 is our premium seam locking solution. With hydraulic power and CNC control, it delivers automatic, consistent seam locking at high speed — perfect for duct factories producing 100+ sections per day.
- CNC automatic: Feed the duct and the machine locks the full seam automatically
- Hydraulic power: Consistent locking force — every seam tight and uniform
- 1.5mm capacity: Handles thick material for high-pressure duct systems
- 200–300 seams/hour: 2–3x faster than manual methods
- Consistent quality: No human error — every seam identical, every time
View CNC Hydraulic Seam Locker →
How to Choose
- Daily seam volume? <50/day → Portable Electric. 50–150/day → Pittsburgh L12. >150/day → CNC Hydraulic HF-1550
- Do you need portability? Job site work or flexible shop layout → Portable Electric
- Material thickness? ≤1.2mm → all work. ≤1.5mm → CNC Hydraulic only
- Operator availability? CNC Hydraulic needs only one operator and is less labor-intensive
- ROI calculation? If you're currently using manual hammers or portable tools for 100+ seams/day, the CNC Hydraulic pays for itself in labor savings within 6–12 months
Preda Care: Seam Lockers That Keep Locking
All seam lockers use hardened rollers and dies for long life. Replacement rollers and dies ship free when needed. CNC models include lifetime remote PLC support. Portable tools include free replacement motor brushes and cords. On-site training available for all models.
Still Hand-Hammering Seams?
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