This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1200, 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 SI40X1200
The AirTAC Airtac SI40 Standard Cylinder SI40X1200 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1200mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X1200, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1200 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X1200
- 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 SI40X1200
The AirTAC SI40X1200 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 1200mm stroke. Delivering 628N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI40X1200. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, force and accessories, fitting existing fixtures perfectly.
The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This non-magnet SKU cannot take a sensor. For high heat, Viton H seals raise the temperature range to 0-150C.
Airtac SI40 Standard Cylinder SI40X1200 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1200 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1200 |
| Bore size | Ø40 mm |
| Stroke | 1200 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 SAI40X1200 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 SAI40X1200 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 SI40X1200
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1200 | 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 SI40X1200 Is Used
Long-Reach Diversion
Drives 1200mm gating arms on packaging lines to reroute heavy cartons, utilizing the 628N push force effectively over the extended travel distance.
High-Bay Ejection
Pushes totes from vertical storage shelves at 0.7 MPa (879N), requiring external linear guides to prevent piston rod bending across the 1.2m span.
Replacing the Airtac SI40 Standard Cylinder SI40X1200 with the SAI40X1200
To replace the SI40X1200, order the SAI40X1200. Confirm the ISO 15552 mounting interface, 40mm bore, 1200mm stroke, G1/4 port (PT/G/NPT thread options), and mounting accessory (LB, FA, TC, etc.). Because this is a non-S SKU, it lacks a magnet and cannot accept CS1-B/DS1-B sensors. If sensing is required, switch to an SAI40X1200S. Sizing both ways: a 50mm bore offers 982N push at 0.5MPa, while a 32mm bore provides 402N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 1200mm, prevent rod bending by guiding the load externally to avoid side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1200
- ✓ 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 SI40X1200 FAQ
Yes, the AirTAC SI40X1200 is discontinued. The direct replacement is the SAI40X1200. It shares the same ISO 15552 mounting interface, 40mm bore, 1200mm stroke, output force, G1/4 port, and accessories, fitting directly into existing fixtures.
The 40mm bore uses a G1/4 air port and an M12x1.25 rod thread. Force ratings are: 628N push and 528N pull at 0.5 MPa; 879N push at 0.7 MPa; 1130N push at 0.9 MPa; and a theoretical max of 128 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1200
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1200 replacement — usually within 7-8 hours.