This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX230, 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 SI40AX230
The AirTAC Airtac SI40 Standard Cylinder SI40AX230 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 230mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX230, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke230 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX230
- 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 SI40AX230
The AirTAC SI40AX230 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 230mm stroke. It delivers 628N push and 528N pull at 0.5MPa through a G1/4 port. The direct replacement is the SAI40AX230, sharing the exact ISO 15552 mounting interface, force, and dimensions. This SKU uses an SUS420J2 stainless piston rod (-A) for corrosion resistance and lacks a magnet, so it cannot accept a position switch.
Upgrading to the SAI40AX230 retains all ratings but adds an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line. Note that a plain cylinder drifts on air loss; the cushion only decelerates.
Airtac SI40 Standard Cylinder SI40AX230 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX230 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX230 |
| Bore size | Ø40 mm |
| Stroke | 230 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 SAI40AX230 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 SAI40AX230 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 SI40AX230
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×230 | 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 SI40AX230 Is Used
Diverting Gate
Actuates routing flaps on package lines, using the 628N push force to reliably pivot heavy cardboard traffic at sorting junctions.
Stainless Clamping
Secures metal workpieces for machining, leveraging the SUS420J2 rod option to resist coolant corrosion in wet manufacturing cells.
Vertical Lift Stop
Raises lightweight pallet stops up to 32kg, benefiting from the 230mm stroke to clear tall loads on roller conveyors.
Replacing the Airtac SI40 Standard Cylinder SI40AX230 with the SAI40AX230
To replace the discontinued SI40AX230, order the SAI40AX230. Confirm the ISO 15552 mounting interface, 40mm bore, 230mm stroke, G1/4 port (PT/G/NPT threads), and your specific mounting accessory. Because this is a no-S SKU, it cannot support legacy CS1-B/DS1-B sensors; if sensing is needed, select an SAI with a magnet. At 230mm stroke, guide rods are recommended to prevent side-load bending. Sizing both ways: the neighbouring 32mm bore yields 402N push at 0.5MPa, while the 50mm bore yields 982N. A plain cylinder does not hold load without live air; for load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX230
- ✓ 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 SI40AX230 FAQ
Yes, the SI40AX230 is discontinued. The direct replacement is the SAI40AX230. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 230mm stroke, 628N force, G1/4 port, and mounting interface, but features an upgraded piston seal.
This double-acting cylinder features a G1/4 air port and M12x1.25 rod thread. It delivers 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX230
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX230 replacement — usually within 7-8 hours.