Size coil handling from the coil, not from the machine. Know the heaviest coil you will buy, its width and its inside and outside diameters, then choose a reel or decoiler rated above that weight with a mandrel that fits the inside diameter. For a portable standing seam machine that usually means 16 to 20 inch ID coils of up to about 3,000 lb on the machine’s own reel rack, with a free-standing decoiler for anything bigger. A shop that buys wide master coils and slits its own needs a powered decoiler rated for the master coil, a slitter or slit-and-cut-to-length line, and a coil tipper to stand coils up safely. Here is the math and the equipment, with prices checked in 2026.
Start with the coil
Painted roofing coil is sold slit to width on a standard core. One major panel supplier’s slit coil data, for example, lists a 16 to 20 inch inside diameter, a 2,500 lb maximum weight and widths from 4 to 48 inches. If you do not know a coil’s weight, work it out from its size:
- Weight (lb) = 0.7854 x (OD squared minus ID squared) x width x density, with all dimensions in inches.
- Density is about 0.2836 lb per cubic inch for steel.
- Example: a 20-inch-wide steel coil on a 20-inch ID wound to a 32-inch OD weighs about 2,780 lb, or 139 lb per inch of width (PIW). The same coil 24 inches wide is about 3,340 lb.
Coil processors publish PIW charts built on the same formula; one lists 269 PIW for a 40-inch OD on a 20-inch ID, which matches the math within a couple of pounds. Run the numbers for the heaviest coil your supplier ships, not the average one.
Reels and arbors on portable machines
Portable roll formers carry their coil on an overhead reel rack. New Tech Machinery’s figures are a good reference because so many of its machines are on the used market.
| NTM item | Rating | 2026 price |
|---|---|---|
| DR01-EX expandable arbor | 16 to 20 in ID; 3,000 lb on the overhead rack, 5,000 lb on the free-standing decoiler | $2,800 |
| DR1 dual overhead reel rack | Two arbors, 6,000 lb combined | $3,500 |
| FSD1 single free-standing decoiler | 5,000 lb | $2,900 |
| SSQ3 coil limits | 15 to 30 in wide; 32 in maximum OD on the rack, 45 in on the decoiler | Included |
Two details catch buyers out. First, a 3,000 lb arbor rating and a 32-inch OD limit together mean a wide coil can be too heavy for the rack even when it fits; the 24-inch example above is over the limit. Second, NTM’s SSQ II literature derates the dual rack to 2,700 lb per coil when the notching system or angle slitter is installed. Englert lists a 3,000 lb expandable arbor and stand for its fixed-panel machines. When your coils exceed the rack, put them on a free-standing decoiler behind the machine.
Stand-alone decoilers: manual or powered
A manual decoiler is a mandrel on a stand with a drag brake; the machine pulls the strip off. A powered decoiler turns the coil with a motor and uses a loop or dancer arm to feed slack so the line does not drag the coil. Hold-down arms keep a heavy coil from springing open when the bands are cut, and a coil car lifts the coil onto the mandrel.
| Type | Example | Capacity and mandrel | Price seen in 2026 |
|---|---|---|---|
| Manual, narrow | ESE mini decoiler | 3,000 lb, 24 in wide, 15 to 21 in expanding core | $1,650 new |
| Manual, standard | ESE decoiler | 3,000 lb, 34 in wide, 38 in max OD | $1,900 new |
| Manual, wide | ESE extra-wide decoiler | 5,000 lb, 48 in wide | $2,400 new |
| Powered, with loop control | Coilmate CM6048, 1995 | 6,000 lb | $5,950 used |
| Hydraulic with coil car | Changzhou | 10,000 lb, 17.5 to 21 in ID | $10,500 used |
| Industrial reels | Cooper-Weymouth Peterson | 4,000 to 66,000 lb, 18 to 84 in wide | Quote only |
Manual decoilers are fine for light coils fed into a portable machine or a slitter by hand. Move to a powered decoiler with loop control once coils get heavy enough that the line struggles to pull them, or when an in-plant line runs continuously.
Slitters and slit-and-cut-to-length lines
Buying wide coil and slitting it yourself lets a shop stock one width of each color and cut trim strips and panel widths to order. A manual gang slitter with fixed knife spacing covers occasional strips. A slit-and-cut-to-length line adds programmable knife positions and a shear, turning a master coil into finished blanks.
- Krasser Centurio. The Austrian line is built in 1250 and 1500 sizes for 10 to 49 inch and 16 to 60 inch widths, steel from 0.4 to 1.5 mm (about 27 to 16 gauge), up to eight knife pairs with automatic positioning, up to 35 meters (about 115 feet) per minute and coils up to 8 tonnes, about 17,600 lb, with its coil storage. A 2020 Centurio 1250 with 97 hours was listed in 2026 at EUR 129,000 ex works, and a 2023 unit at EUR 99,000.
- Krasser Legionnaire. Announced through its US distributor in 2014 at 49.2 inches wide and about 100 feet per minute, switching between knife sets in under 30 seconds. A used 2018 Legionnaire 1250 was listed for coils up to 11,000 lb.
- Cidan. Complete lines run far higher: a 2023 Cidan drip-edge line with a 16,000 lb powered decoiler, slitter and shear was listed at $514,900.
Size a slitter by maximum width (it must take your widest master coil), gauge, coil weight, and the number of knife sets you will switch between in a day.
Coil tippers and upenders
Coils often arrive lying on a pallet and have to be stood up, or turned the other way, before they go on a mandrel. A coil tipper or upender rotates the coil under control instead of a crew levering it over with a forklift, a job one maker of coil equipment calls a dangerous process. Cooper-Weymouth Peterson builds upenders rated from 10,000 to 50,000 lb, electric or hydraulic, with a brake that holds the load in any position. Prices listed in October 2026 included new Coilquip upenders at $16,750 for 6,000 lb with a 48-inch maximum OD, $26,500 for 12,000 lb and $36,200 for 20,000 lb, and a used 4,000 lb unit at $7,950.
Matching it all to your roll former
- Weight: rate every reel, decoiler and tipper above your heaviest coil, and remember options like notching can derate a rack.
- Inside diameter: confirm the mandrel range covers your supplier’s cores; 16 to 20 inch arbors cover most roofing coil.
- Width and OD: check the machine’s coil width range (15 to 30 inches on NTM’s commercial portables) and maximum OD.
- Feed: powered decoilers with loop control for continuous in-plant lines; manual stands for portables.
- Safety: ANSI B11.18 is the US safety standard for machines that process coiled strip, sheet and plate, and a useful checklist when you buy used coil equipment without its guards.
Frequently asked questions
How heavy a coil can a portable roll former’s overhead rack hold?
On NTM machines, 3,000 lb per arbor on 16 to 20 inch cores and a 32-inch maximum OD, or 2,700 lb per coil on an SSQ II with notching installed. Heavier coils go on a free-standing decoiler.
Do I need a motorized decoiler?
Not for a portable machine running coils of a few thousand pounds. A motorized decoiler with loop control earns its keep on heavy coils and continuous in-plant lines, where pulling the coil would strain the drive and spoil length accuracy.
Is a used slitter worth it?
It can be if you buy enough painted coil to stock master coils. Check knife condition, the knife-positioning system and the decoiler capacity before you buy.
Browse used decoilers and used slitters, see Krasser and New Tech Machinery listings, and plan the move with our shipping and rigging guide.
