The AirTAC Airtac SC Standard Cylinders SC40X250T is a genuine double-acting standard air cylinder with a Ø40mm bore and 250mm stroke, PT1/4 air ports and adjustable end cushioning. It is used for push, pull, lift and clamp motion in industrial automation.
The AirTAC SC40X250T is a 40 mm bore, 250 mm stroke double-acting tie-rod cylinder built for North-American plumbing: its ports are cut as NPT 1/4, a tapered thread that seals on the thread flanks with sealant or PTFE tape rather than on a face washer. At 0.5 MPa it delivers about 628 N pushing and 528 N pulling, rising to 1130 N at 0.9 MPa. The 16 mm chromed rod carries an M12x1.25 knuckle thread. With body length A of 142 mm, the fully extended cylinder measures roughly 392 mm. The 21 mm adjustable cushion decelerates the piston near each stroke end, and the trailing T on the order code is what flags the NPT port option against the standard PT version of this bore.
| Model | Airtac SC Standard Cylinders SC40X250T |
|---|---|
| Series | SC standard tie-rod cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 mm |
| Acting type | Double acting |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SC series datasheet. Operating pressure 0.15–1.0 MPa, proof pressure 1.5 MPa, temperature −20 to +70 °C. Confirm against the product label before installation. Thread options: PT (standard) / G.
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (approx.) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
| SC | Standard tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×250 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related variants: SCD (double rod), SCJ (adjustable stroke), SCT (multi-position). Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
A 250 mm stroke advances a drilling spindle on a small machining fixture; the 628 N push at 0.5 MPa handles the feed return spring, and NPT 1/4 ports tie into the machine's imperial pipe circuit.
Raising a 45 kg carton stack needs roughly 441 N, comfortably inside this cylinder's 628 N push at 0.5 MPa, with the 21 mm cushion stopping the load gently at top of stroke.
Compacting plastic offcuts in a workshop baler uses the 1130 N available at 0.9 MPa over a long 250 mm compression sweep, driven through US-standard NPT plumbing.
The SC40X250T sits mid-range in the SC force ladder: the next bore down, SC32, gives only 402 N at 0.5 MPa, while stepping up to SC50 nearly doubles output to 982 N at the same pressure. Choose this bore when your load sits between those figures and a 250 mm reach is needed. The T suffix is the deciding factor for plumbing: if your machine is piped with North-American NPT fittings and sealant, this version mates directly; European or Asian OEM manifolds sealed with bonded washers need the G variant instead. Match the replacement on five points: 40 mm bore, 250 mm stroke, NPT port thread, mounting accessory (LB, FA, FB, CA, CB, TC, TCM1) and magnet (-S) if a CMSG sensor is fitted.
Quick checklist
Full figure set for this 40 mm bore: push 628 N and pull 528 N at 0.5 MPa, push 879 N at 0.7 MPa, push 1130 N at 0.9 MPa (the maximum operating pressure), and a theoretical maximum of 128 kgf at 1.0 MPa. Air supply must be filtered to 40 um, and operating pressure runs from 0.15 to 1.0 MPa.
It identifies NPT 1/4 tapered ports, the North-American pipe standard that seals on the thread with sealant. Check the whole match, not just the thread: 40 mm bore, 250 mm stroke, mounting accessory, and the -S magnet option if your position sensor relies on it. A PT or G ported SC40 of the same size will not bolt into an NPT circuit without adapters.
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