Airtac SAI40 Standard Air Cylinder SAI40BX250
The AirTAC SAI40 Standard Air Cylinder SAI40BX250 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 250mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it interchangeable with other ISO 15552 cylinders at the mounting interface.
- BoreØ40 mm
- Stroke250 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAI40 Standard Air Cylinder SAI40BX250
The AirTAC SAI40X250 is a double-acting ISO 15552 profile cylinder engineered to deliver 628 N of push force and 528 N of pull force at 0.5 MPa. Its 250 mm stroke provides the extended travel needed for mid-range positioning tasks. Built with an extruded aluminum barrel, this unit omits traditional tie-rods for a cleaner exterior.
This specific configuration features a SUS304 stainless steel piston rod (option B) for superior corrosion resistance. It utilizes PT tapered port threads and lacks a standard magnet, meaning position sensing via CMSE or DMSE switches is not supported without modification.
Airtac SAI40 Standard Air Cylinder SAI40BX250 Technical Specifications
| Model | Airtac SAI40 Standard Air Cylinder SAI40BX250 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| 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, 30 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAI40 Standard Air Cylinder SAI40BX250
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×250 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAI40 Standard Air Cylinder SAI40BX250 Is Used
Gate Diversion
Actuates routing flaps on packaging lines, utilizing the 250 mm stroke to shift product streams between parallel conveyors.
Carton Push-off
Provides the 628 N push force required to eject packed cardboard boxes from a staging platform onto a wrapping station.
Parts Ejection
Ejects molded plastic parts from a machining center, relying on the SUS304 rod to resist coolant moisture and corrosion.
Is the Airtac SAI40 Standard Air Cylinder SAI40BX250 the Right Cylinder?
Select this 40 mm bore when a 32 mm bore (offering 402 N push at 0.5 MPa) lacks the necessary thrust, but a 50 mm bore (982 N push) would be physically oversized. At 250 mm of stroke, the unsupported rod length is significant; side loads can deflect the rod and accelerate bearing wear. Employ external guide rails or a guided cylinder to absorb lateral forces.
For true ISO 15552 mounting interchangeability, match the 40 mm bore, 250 mm stroke, G1/4 PT port, and your chosen mounting accessory (such as an LB foot or FA flange). Because this standard variant lacks a magnet, it cannot hold its position pneumatically if air pressure is lost—use an external pilot-operated check valve for load holding.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAI40 Standard Air Cylinder SAI40BX250 FAQ
At an operating pressure of 0.5 MPa, this 40 mm bore cylinder generates 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
Yes, the SAI40X250 is dimensionally interchangeable per ISO 15552. You can use it as a direct replacement for other ISO 15552 profile cylinders with a 40 mm bore and 250 mm stroke, provided your port and mounting dimensions align.
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