Edge Hemming Machine
Last updated: October 14, 2026
Edge hemming and folding machine for safe, clean sheet metal edges in duct fabrication. Run it standalone for hemming and edge folding, or specify it as optional roller sets integrated into a PREDA Pittsburgh lockformer.
Technical Specifications
What is a Edge Hemming Machine?
An edge hemming machine folds the raw cut edge of a sheet metal panel back on itself into a rolled hem. In HVAC duct work this turns a sharp, dangerous sheet edge into a safe finished edge that also stiffens the panel — the same hem profile used on Pittsburgh lock seams, drive cleats and S-slip connections. Shops that already run a Pittsburgh lockformer can add hemming as extra roller sets on the same machine; shops that only need edge finishing run the standalone unit.
Key Features
- Rolls a safe, finished hem along sheet metal edges — no sharp cut edges leave your shop
- Electric drive for consistent hem depth across the full width
- Available as a standalone machine or as optional roller sets on PREDA Pittsburgh lockformers (SA-12HB / SA-15HB)
- Forms hems and drive cleat profiles in the same pass family as your lockforming line
- Heavy-duty steel frame, CE certified, 2-year warranty
Sharp Edges and Hand-Hemmed Panels Slowing Your Line?
Every raw duct edge is an injury claim waiting to happen, and hand-folding a hem with a mallet and folder takes minutes per panel — with a different result every time.
A powered edge hemming machine rolls a consistent, safe hem at line speed. The edge is finished the moment the panel is cut, so it can go straight to assembly without a separate deburring or folding step.
How It Transforms Your Production Line
The Edge Hemming Machine works on a proven principle — here is the step-by-step workflow that makes it possible:
Panel Feed
The cut panel or strip is fed into the hemming rollers — on standalone units by the operator, on lockformer-integrated units directly off the forming rollers.
Edge Folding
Powered rollers fold the edge back on itself in one continuous pass, producing a uniform hem along the full width.
Hem Setting
A second roller set closes and sets the hem so it holds its shape through handling and assembly.
Finished Edge Out
The panel exits with a safe, stiffened edge ready for Pittsburgh lock seaming, cleat attachment or direct assembly.
Technical Specifications & Performance Data
Every specification on this machine is chosen for a reason. The table below shows not just the numbers, but what each one means for your daily production:
| Parameter | This Machine | What It Means for You |
|---|---|---|
| Control System | Electric drive with roller stand | Consistent, repeatable operation with minimal operator training |
| Construction | Heavy-duty steel frame | Vibration-free operation, 10+ year service life |
| Certification | CE certified | Meets European safety and quality standards |
| Warranty | 2 years | Peace of mind with comprehensive factory warranty |
Problems Solved: Before vs. After
We asked HVAC fabricators about their biggest production headaches. Here is how this machine directly addresses each one:
| Without This Machine | With This Machine |
|---|---|
|
✕ Sharp raw edges
Cut edges cause handling injuries and warranty claims |
✓ Rolled safe hem
Finished, safe edges the moment panels are cut |
|
✕ Hand-folded hems
Mallet-and-folder hems vary panel to panel |
✓ Powered roller hemming
Uniform hem depth and closure across the full width |
|
✕ Separate finishing step
Deburring and folding is a whole extra station |
✓ Inline hemming option
Hemming happens on the same machine as lockforming |
|
✕ Panel edge damage
Manual folding creases and marks the visible face |
✓ Roller-formed hem
Clean formed edge with no tool marks on the panel face |
Where It Fits in Your Factory
This machine is versatile enough to serve multiple production scenarios. Here are the most common configurations our customers use:
Pittsburgh Lockformer Shops
Order the optional hemming roller sets with your SA-12HB or SA-15HB and hem, form drive cleats and close seams on one machine.
Standalone Edge Finishing
Fabricators who only need safe edges run the standalone unit — the lowest-cost way to finish every panel that leaves the shear.
Architectural & Fitting Shops
Trim, flashing and fitting panels get a professional hemmed edge without a sheet metal shop full of tooling.
Safety-Focused Plants
Rolled hems remove the sharp-edge hazard from handling, packing and installation — fewer injuries, fewer complaints.
Frequently Asked Questions
Click each question to see the answer. These are the questions our sales engineers hear most often:
Professional Packaging & Global Shipping
Every machine is professionally packaged and secured in a container for safe delivery to your port. We send you loading photos before the ship sails.
Calculate Your Return on Investment
Based on average industry data, here is what a typical customer saves after installing this machine:
* Figures based on average customer data for a shop producing 100-500 bends per day. Your actual results will vary based on production volume, labor rates, and current efficiency levels. Contact our engineers for a customized ROI calculation based on your specific operation.
Ready to Upgrade Your Electric Production?
Get a customized quote within 24 hours. Our engineers will help you configure the right machine for your specific production requirements.
WhatsApp / WeChat: +86-18355321923 | Email: jason@predamachine.com
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Buying Guides for This Machine Type
Before you request a quote: how this machine class compares, what it costs, and how to size it for your production volume.
Pittsburgh Lockformer Buying Guide
SA-12HB vs SA-15HB, roller options including edge hemming, and how to match a lockformer to your gauge and volume.
Read the guide → MaintenancePittsburgh Lockformer Maintenance Guide
Roller alignment, lubrication and hem-roller changeover intervals to keep formed edges clean.
Read the guide → Buying GuideSheet Metal Bending Buying Guide
Benders, brakes and hemming equipment compared — what each one is for in a duct shop.
Read the guide →
