This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX225S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI40 Standard Cylinder SI40AX225S
The AirTAC Airtac SI40 Standard Cylinder SI40AX225S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 225mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX225S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke225 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX225S
- 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 SI40 Standard Cylinder SI40AX225S
The AirTAC SI40AX225S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 225mm stroke, and an SUS420J2 stainless steel rod. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40AX225S, which shares identical ISO 15552 mounting dimensions, stroke, and output force.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This -S model includes a piston magnet for legacy CS1-B/DS1-B sensors. Note that air cushions only decelerate; use an external rod lock or pilot check valve to hold loads.
Airtac SI40 Standard Cylinder SI40AX225S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX225S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX225S |
| Bore size | Ø40 mm |
| Stroke | 225 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, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI40AX225S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / 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 | |
The SAI40AX225S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI40 Standard Cylinder SI40AX225S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×225 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI40 Standard Cylinder SI40AX225S Is Used
Stainless Rod Clamping
Ideal for securing machined components on automated lines where the SUS420J2 rod resists moisture and coolant splash.
Package Diverting
Provides reliable 225mm stroke actuation to push cartons off a main belt, utilizing the 628N force at 0.5MPa.
Replacing the Airtac SI40 Standard Cylinder SI40AX225S with the SAI40AX225S
To replace the SI40AX225S, order the SAI40AX225S. Confirm the ISO 15552 mounting interface (LB, FA, TC, etc.), the 225mm stroke, the G1/4 port, and the -S magnet for current AirTAC switches. The -A rod is SUS420J2 stainless steel; if corrosion resistance is not needed, the default carbon steel rod works. At 0.5MPa it pushes 628N; dropping to a 32mm bore yields 402N, while a 50mm bore gives 982N. Because the 225mm stroke exceeds 300mm, ensure guide rails prevent rod bending. For load holding on air loss, select the SAIL or BSAI lock variant, as standard cushions only decelerate.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX225S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI40 Standard Cylinder SI40AX225S FAQ
Yes, the SI40AX225S is discontinued. The direct replacement is the SAI40AX225S. It is dimensionally interchangeable per ISO 15552, maintaining the same 40mm bore, 225mm stroke, 628N force, and G1/4 port.
The G1/4 port bore delivers a push of 628N and pull of 528N at 0.5MPa, 879N at 0.7MPa, 1130N at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX225S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX225S replacement — usually within 7-8 hours.