This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1200SN, 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 SI40X1200SN
The AirTAC Airtac SI40 Standard Cylinder SI40X1200SN 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 SAI40X1200SN, 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 → SAI40X1200SN
- 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 SI40X1200SN
The AirTAC SI40X1200SN is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 1200mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40X1200SN, matching the interface, force, and stroke.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. It retains the NBR (-N) seal rated for -20 to +70C, with Viton H available for high heat. The built-in magnet (-S) works with legacy CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X1200SN Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1200SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1200SN |
| 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 SAI40X1200SN 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 SAI40X1200SN 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 SI40X1200SN
| 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 SI40X1200SN Is Used
Long-Reach Material Transfer
Drives 1200mm stroke pushers on conveyor lines to shift packages between processing stations, utilizing the 628N push force at 0.5MPa.
High-Bay Ejection
Actuates long-travel ejection arms in automated storage systems, requiring external guide rails to support the extended 16mm rod over 1.2 meters.
Carton Forming Press
Provides the 32kg safe vertical lift margin to fold and press corrugated carton blanks, with NBR seals operating reliably at standard temperatures.
Replacing the Airtac SI40 Standard Cylinder SI40X1200SN with the SAI40X1200SN
To replace the SI40X1200SN, order the SAI40X1200SN. Confirm the ISO 15552 mounting interface (LB, FA, TC, etc.), the 40mm bore, 1200mm stroke, G1/4 port, and the NBR seal. Because this is a 1200mm long stroke, use external guides to prevent rod bending and side-load damage. For sizing down, a 32mm bore gives 402N [email protected]; sizing up to 50mm yields 982N. Note that a plain cylinder drifts on air loss—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.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1200SN
- ✓ 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 SI40X1200SN FAQ
Yes, the SI40X1200SN is discontinued. The direct replacement is the SAI40X1200SN. It is dimensionally interchangeable per ISO 15552, offering the same 40mm bore, 1200mm stroke, 628N force, G1/4 port, and mounting fixtures.
The 40mm bore features a G1/4 air port and M12x1.25 rod thread. Force output is 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical maximum of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1200SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1200SN replacement — usually within 7-8 hours.