The AirTAC Airtac SC Standard Cylinders SC40X250ST 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 SC40X250ST is a double-acting tie-rod cylinder with NPT 1/4 in tapered ports, a built-in magnet and a 250 mm stroke. At 0.5 MPa it develops about 628 N on extension - comfortable for carton pushes, diverters and fixture clamps on North-American-plumbed machines. Because NPT is a tapered thread, it seals on the thread flanks themselves: wrap PTFE tape or apply pipe sealant rather than relying on the bonded face washer used by G/BSPP port versions. Bore 40 runs a 16 mm rod with an M12x1.25 knuckle thread and a 21 mm adjustable cushion at each end to decelerate the piston near stroke close. Body length A is 142 mm, giving an approximate extended length of 392 mm. The magnet works with CMSG, DMSG or EMSG switches, so end-of-stroke or mid-stroke confirmation comes straight off the cylinder without external brackets.
| Model | Airtac SC Standard Cylinders SC40X250ST |
|---|---|
| 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.
Sweeping sealed cartons off a North American packaging conveyor needs roughly 628 N at 0.5 MPa - well inside this bore. The NPT 1/4 ports land directly on standard US compression fittings with no adapters.
At 0.9 MPa the cylinder reaches 1130 N, enough to clamp steel fixtures through the full 250 mm retract that clears manual part loading. The magnet confirms the clamp is fully open before cycle start.
A 250 mm stroke swings a divert gate clear of the product lane while the built-in magnet and a CMSG switch report gate position to the PLC before the next layer forms.
Size in both directions: step down to the SC32 (402 N push at 0.5 MPa) if your load leaves force headroom and you want a lighter frame; step up to the SC50 (982 N push at 0.5 MPa) if cycles are fast or side load eats into the margin. At 250 mm the 16 mm rod stays well inside the bore's 1200 mm standard-stroke limit, but keep the load axial - if side load is present, add an external guide rather than stressing the rod bearing. Match the thread to your plumbing standard first: order this ST version only if your manifold and fittings are NPT (tapered, sealant-sealed, common in North America). If your line uses G1/4 BSPP parallel ports with bonded washers, take the G-suffix variant instead of adapting with bushings. To drop in a replacement, match five points exactly: bore, stroke, port thread (NPT here, not the standard PT Rc1/4), mounting accessory (LB, FA, FB, CA, CB, TC or TCM1) and magnet (-S).
Quick checklist
Per the AirTAC datasheet for bore 40: 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, and 1130 N push at 0.9 MPa (the top of the 0.15-1.0 MPa operating range). The theoretical maximum at 1.0 MPa is about 128 kgf. Real installed force is lower once friction and back-pressure are counted, so size with margin.
ST combines the built-in magnet with NPT 1/4 tapered ports - a made-to-order thread versus the standard PT (Rc1/4) version, aimed at North American plumbing where the tapered thread seals with tape or sealant. For a like-for-like swap, match another AirTAC SC tie-rod cylinder on all five points: bore, stroke, port thread, mounting accessory and magnet. The SC is shorter than an ISO 15552 cylinder, so it is not dimensionally interchangeable with ISO 15552 profile units.
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