What an S Cleat Lock Former Actually Does
The S cleat lock former SA-12S roll-forms the S-slip profile on galvanized strip. The S-slip — usually just called the S cleat — is the sliding connector that closes the transverse joint between two rectangular duct sections. Each section end is formed with a pocket, the S cleat slides over both pockets, and the joint is mechanical: no rivets, no welding, no sealant at the clip. That is the whole job of the machine, and it does it all day without changeover.
Where S cleats sit in the duct assembly family matters when you are buying. The modern TDF/TDC system closes corners with corner pieces and a TDF folder; the S-slip system is the older, still widely used approach for transverse joints, and it remains standard on maintenance, retrofit and residential work in many markets. A shop that runs S-slip duct as a standing product either forms cleats on a general brake or runs a machine set up for nothing else. The SA-12S is the second option, at the entry price of the cleat machine family.
SA-12S Specification
| Parameter | S Cleat Lock Former SA-12S |
|---|---|
| Role | Dedicated S-slip (S cleat) forming |
| Profile | S cleat; combined builds also form C cleat, Pittsburgh and claw (build dependent) |
| Material thickness | 0.5–1.2 mm galvanized (about 24–18 ga) |
| Forming speed | 12 m/min on the dedicated build; combined builds listed at 1–23 m/min |
| Motor power | 1.1 kW on the dedicated build; 2.2 kW on the four-function build |
| Weight | 280 kg dedicated; 365 kg four-function build |
| Footprint | 1490×630×1000 mm on the four-function build |
| Electrical supply | Single or three phase — confirm voltage and phase at order |
| Roll tooling | Hardened alloy steel forming rolls, ground shafts, needle bearings, matching cut gears |
| Control | PLC with touchscreen on listed builds (build dependent) |
| Certification / warranty | CE / 2 years (confirm terms on the quotation) |
| Typical price | About USD 3,100 FOB |
Read the table as three buying constraints. Gauge: 0.5–1.2 mm covers the standard commercial range — 24 ga light connector stock through 18 ga heavy duct work — and nothing above it; sustained 16 ga belongs to a different machine class. Speed: 12 m/min is a forming speed, not a promise about your throughput, which depends on how fast the operator feeds and removes. Power: at 1.1–2.2 kW the machine runs on an ordinary shop supply — but confirm voltage and phase before ordering, exactly as with any machine.
How the S-Slip Profile Is Formed
The SA-12S is a roll former, not a press brake. Strip is fed into a train of driven roller stations; each station bends the edge a few degrees further than the last, and the profile emerges complete at the exit. The manufacturer describes seven or more precision roller stations progressively bending the metal edge, with the finished section exiting ready for assembly. Because the strip is in contact with the rolls along its whole formed length, the profile is identical piece after piece — which is the entire argument for the machine.
The tooling is where the machine lives or dies. Preda builds the forming head from all-steel construction with hardened, ground shafts, and the forming rolls are hardened and driven through matching cut gears on needle bearings. In practice that means the roll train holds its geometry under load and the gears share torque across stations instead of wearing one station first. Ask at quotation what the roll material and hardness are, and whether the roll shafts are ground or turned — the answer separates machines that hold profile for years from machines that drift in months.
Cleat Fit: The Three Variables That Are Not the Machine
Strip width
S cleat fit depends on strip width more than on anything the machine does. Coil-to-coil width variation is wider than most shops assume, and a cleat that will not seat on the duct pocket is a purchasing problem, not a forming problem. Measure width on the first piece of every new coil and record supplier and width together.
A positive length stop
Free-hand positioning produces variable cleat lengths, and variable length is the most common cause of assembly difficulty on site. Fit a stop, seat every piece against it, check the stop weekly.
Deburred ends
A burr on the strip end prevents the cleat seating fully, and the fault looks like a forming fault when it is really a cutting fault. Deburr before forming and check the shear blade — a worn blade is usually the root cause.
Dedicated vs Combined: Choosing Your Cleat Machine
| Machine | Profiles | Cycle | Best fit |
|---|---|---|---|
| SA-12S (this machine) | S cleat; combined builds S/C/Pittsburgh/claw | Set once, no changeover | S cleats are the standing product |
| S and drive machine | S-slip + drive cleat | Two settings, one machine | Both profiles at moderate volume |
| CB-700 drive cleat bender | Drive cleat only | Bend cycle, 5–10 s per bend | Drive cleats are the volume item |
| SA-12HB Pittsburgh lockformer | The duct seam | Upstream operation | Building the duct sections themselves |
The pattern: dedicated machines buy per-piece speed and zero changeover error; combined machines buy floor space and flexibility. If your assembly system uses S cleats exclusively, the dedicated machine wins every time — there is no changeover to get wrong. If you need both S and drive profiles at moderate volume, the combined S and drive machine is the rational middle. And note that none of these replaces the lockformer that forms the duct seam itself.
Throughput and the Economic Case
The manufacturer's own comparison: one worker hand-forms 20–30 panels an hour; the powered machine lets one operator process 100+ panels an hour. Even discounting the marketing, the direction is real — the machine removes set-up, checking and adjusting from every piece. At 100+ cleats an hour the SA-12S takes cleats off the critical path entirely, which is the point: batching becomes nearly free because the machine is set and waiting either way.
Run the arithmetic on your own numbers before ordering. If cleats are an occasional job on a brake that has other work to do, the honest answer may be to keep using the brake. The crossover is volume, not ambition.
Installation and Acceptance Checklist
- Level floor and bolt-down; 280–365 kg of machine; mobile builds exist, but bolt it for production.
- Supply matched; 1.1–2.2 kW; confirm voltage, phase and plug at order, not at the port.
- Trial on micrometer-verified scrap of every gauge you run, at your coating weight — never the supplier's demo stock.
- Profile confirmed against a customer sample before running any batch — S-slip profiles vary by market and the wrong profile reaches site before anyone notices.
- One recorded setting per gauge, on a card at the machine; lock and mark every adjustment.
- Positive length stop fitted; every piece seated against it; weekly check.
- Dry-fit finished cleats against a mating duct section — never judge fit by eye.
- Deburr cut ends before forming; inspect shear blade condition.
- Roll material, hardness and shaft finish confirmed in writing at order stage.
- CE documentation and warranty terms in writing; spare tooling availability and lead time confirmed before the balance payment.
Common Faults and What They Actually Mean
With the tooling set and locked, faults come from stock, wear or the wrong profile — not from adjustment. Check the strip before you touch the machine.
| Symptom | Most likely cause | What to do |
|---|---|---|
| Cleat will not assemble | Wrong profile for the system | Confirm against a customer sample before any batch; get the specification in writing at order stage |
| Fit varies between coils | Strip width variation | Measure the first piece of each coil; speak to the supplier if width varies beyond tolerance |
| Length inconsistent | No positive stop | Fit a stop; seat every piece against it; check the stop weekly |
| Burr prevents seating | Cut ends not deburred | Deburr before forming; inspect the shear blade — a worn blade is the usual root cause |
| Profile drifts over months | Tooling wear | Dry-fit monthly against a mating section; replace tooling on measurable drift; keep a spare set |
| Adjustment found to have moved | Not locked after set-up | Lock and mark every adjustment; add it to the weekly check |
| Machine struggles on thicker stock | Material above the specified gauge | Verify thickness with a micrometer; never force 16 ga through 18 ga tooling |
FAQ
Can one machine form both S cleats and Pittsburgh locks?
Some builds can — the four-function SA-12S configuration forms S cleat, C cleat, Pittsburgh and claw. The dedicated build forms S-slip only. Which build you are quoted is a purchasing decision: if you only ever run S cleats, the dedicated machine is faster per piece and has no changeover to get wrong; if you need the family, confirm exactly which roll sets are included and what changeover involves.
What gauge does the SA-12S handle?
0.5–1.2 mm galvanized steel — about 24 ga to 18 ga. Stainless and aluminum run within the same range, but set and record a separate adjustment per material; aluminum marks more readily and stainless work-hardens at the bend.
Do we still need a seam closing machine?
For the S-slip joint, no separate seamer — the cleat slides on and the joint is mechanical. But you still need the lockformer that forms the duct seam itself (SA-12HB or similar) if you fabricate the duct sections in-house; the cleat machine is complementary, not a replacement.
How often do the rolls need replacing?
Hardened alloy steel roll trains on ground shafts with needle bearings are measured in years of two-shift production, not months. The practical answer: dry-fit monthly against a mating section and replace on measurable drift. Keep a spare set — a worn roll discovered mid-job stops the shop.