This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1230S, 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 SI40X1230S
The AirTAC Airtac SI40 Standard Cylinder SI40X1230S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1230mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X1230S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1230 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X1230S
- 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 SI40X1230S
The AirTAC SI40X1230S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 1230mm stroke. It delivers 628N push and 528N pull at 0.5MPa. AirTAC replaced it with the SAI40X1230S direct upgrade, retaining the exact G1/4 port, M12x1.25 thread, and mounting interface.
This 1230mm unit exceeds the 1200mm standard stroke limit, making it a non-standard made-to-order part requiring external guides to prevent rod bending. The SAI replacement features an upgraded two Y-shaped one-way piston seal for low start-up pressure.
Airtac SI40 Standard Cylinder SI40X1230S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1230S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1230S |
| Bore size | Ø40 mm |
| Stroke | 1230 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 SAI40X1230S 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 SAI40X1230S 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 SI40X1230S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1230 | 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 SI40X1230S Is Used
Long-Reach Diversion
Actuates routing gates on extended conveyor sections where a 1230mm stroke is required to clear wide pallet traffic.
High-Bay Ejection
Pushes totes from deep storage lanes, utilizing the 628N push force to overcome friction over long travel distances.
Replacing the Airtac SI40 Standard Cylinder SI40X1230S with the SAI40X1230S
To replace this SI40X1230S, order the SAI40X1230S direct. It matches the ISO 15552 mounting dimensions, 40mm bore, 1230mm stroke, G1/4 port, and magnet. Because 1230mm exceeds the 1200mm standard stroke, it is non-standard and requires external guides to prevent rod bending over this long extension. For higher force, the 50mm bore offers 982N push at 0.5MPa; for less, the 32mm bore gives 402N. A plain cylinder drifts on air loss as the cushion only decelerates—for load holding, use an external pilot check valve or the SAIL/BSAI lock variants. The SAI family also adds the SAIF self-valve option. This -S model uses CS1-B/DS1-B sensors; a no-S SKU cannot take a sensor.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1230S
- ✓ 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 SI40X1230S FAQ
Yes, the SI40X1230S is discontinued. The direct replacement is the SAI40X1230S. It is dimensionally interchangeable per ISO 15552, keeping the same 40mm bore, 1230mm stroke, G1/4 port, and mounting interface.
This double-acting cylinder has a G1/4 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. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1230S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1230S replacement — usually within 7-8 hours.