The AirTAC Airtac SAU Standard Cylinders SAU50X250ST is a genuine double-acting profile-type standard air cylinder with a Ø50mm bore and 250mm stroke, 1/4" air ports and adjustable end cushioning. Its hard-anodized aluminum-profile barrel is shorter than an ISO 15552 cylinder of the same bore, and it shares SC-series mounting accessories.
The AirTAC SAU50X250ST is a double-acting profile cylinder fitted with NPT 1/4 in tapered pipe ports, ready for North-American plumbing without thread adapters. Its extruded hard-anodized aluminium barrel is shorter than an ISO 15552 cylinder of the same 50 mm bore, so it drops into a 250 mm stroke station where a standard-body cylinder would not fit. At 0.5 MPa it pushes with about 982 N (1374 N at 0.7 MPa); allow roughly 589 N of that as real working force once seal friction and smooth travel are accounted for. The -S magnet built into this SKU lets CMSG, DMSG or EMSG switches clip straight into the profile groove for end-of-stroke or mid-stroke signalling. Vertical-lift check: 982 N equals about 100 kgf of push, so with a 2:1 margin this cylinder lifts roughly 50 kg vertically at 0.5 MPa. Both ends carry 21 mm adjustable air cushions, and seal choices are TPU (standard), Viton H for 0-150 C high-temperature service, or NBR.
| Model | Airtac SAU Standard Cylinders SAU50X250ST |
|---|---|
| Series | SAU profile-type cylinder |
| Bore size | Ø50 mm |
| Stroke | 250 mm |
| Acting type | Double acting |
| Port size | 1/4" |
| Rod thread | M16×1.5 |
| 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 SAU series datasheet. Confirm against the product label before installation. Thread options: PT (blank) / G (BSPP). A high-temperature seal (0-150 °C) is available.
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
| SAU | Profile-type standard cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×250 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAU-family variants: SAUD (double rod), SAUJ (adjustable stroke), SAUF (with built-in solenoid valve), and SAU-S with built-in magnet. Seals: TPU (blank) / Viton H / NBR N. Sensor switches: CMSG / DMSG / EMSG.
A 250 mm stroke product pusher on a US-spec cartoning machine: 982 N at 0.5 MPa indexes stacks of filled cartons into a case, and NPT 1/4 ports tie straight into the machine's imperial air circuit.
Clamping or lifting machined aluminum blanks of up to about 50 kg on a vertical milling fixture - the 2:1-margin lift figure of this 50 mm bore covers typical billet weights with room to spare.
A diverter arm on a parcel sortation conveyor: the -S magnet feeds CMSG switches to the PLC for divert confirmation, while 825 N of pull force at 0.5 MPa returns the gate briskly.
Confirm the T variant fits your plant: the trailing T means NPT tapered threads that seal on the thread itself with tape or dope, so match it to an existing NPT manifold or fittings stock rather than mixing with G/BSPP hardware. Size both ways before committing: the 40 mm bore SAU40X250 gives only 628 N push at 0.5 MPa, while the 63 mm SAU63X250 delivers 1559 N, so the 50 mm bore at 982 N is the midpoint for a mid-weight push or lift. If the load must stay put when air is lost, the piston will drift - add an external rod lock or a pilot-operated check valve, since the cushions only decelerate near stroke end. Mounting uses the SC-series accessory range (LB foot, FA/FB flange, CA/CB clevis) and an I, Y, F or U rod knuckle if the application needs it.
Quick checklist
At 0.5 MPa the 50 mm bore pushes 982 N and pulls 825 N; at 0.7 MPa push rises to 1374 N, and the theoretical maximum at 1.0 MPa is 200 kgf. Operating pressure spans 0.15-1.0 MPa (proof 1.5 MPa), rod speed runs 30-800 mm/s, and the rod is 20 mm carbon steel with 20 um hard chrome.
The S means a piston magnet is installed, so CMSG, DMSG or EMSG reed/electronic switches can seat in the barrel's sensor groove for position feedback. The T means the 1/4 in ports are NPT tapered thread - a made-to-order choice that seals on the thread for North-American fittings, instead of the default PT (Rc) taper.
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