This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X900TC, 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 SI40X900TC
The AirTAC Airtac SI40 Standard Cylinder SI40X900TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 900mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X900TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke900 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X900TC
- 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 SI40X900TC
The AirTAC SI40X900TC is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 900mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI40X900TC, a direct replacement retaining the exact ISO 15552 mounting interface, TC trunnion mount, and M12x1.25 rod thread.
The SAI upgrade features a redesigned piston seal using two Y-shaped one-way elements for lower start-up pressure and longer life. Note this specific SKU lacks a magnet, so it cannot accept CS1-B/DS1-B sensors. If high-temperature operation is needed, Viton H seals raise the limit to 150C.
Airtac SI40 Standard Cylinder SI40X900TC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X900TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X900TC |
| Bore size | Ø40 mm |
| Stroke | 900 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 SAI40X900TC 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 SAI40X900TC 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 SI40X900TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×900 | 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 SI40X900TC Is Used
Long-Stroke Material Transfer
Pushes workpieces between conveyor stations over a 900mm reach, utilizing the 628N thrust at 0.5MPa to move light assemblies.
Pallet Push-Off Mechanism
Uses the TC trunnion mount to pivot and eject packaging rows, relying on external guides to prevent rod bending during the 900mm extension.
Replacing the Airtac SI40 Standard Cylinder SI40X900TC with the SAI40X900TC
To replace the SI40X900TC, order the SAI40X900TC and confirm the ISO 15552 TC trunnion mounting, G1/4 port, and 900mm stroke. Because this SKU has no -S magnet, it cannot support position sensing; order a magneted SAI40X40S if switches are required. At 0.5MPa the 40mm bore yields 628N push and 528N pull; if undersizing, a 32mm bore offers 402N, and if upsizing, a 50mm bore provides 982N. With a 900mm stroke, prevent rod bending by using an external guide to absorb side loads. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X900TC
- ✓ 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 SI40X900TC FAQ
Yes, the SI40X900TC is discontinued. The direct replacement is the AirTAC SAI40X900TC. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 900mm stroke, G1/4 port, TC mount, and output force, so it fits existing fixtures directly.
The 40mm bore uses a G1/4 air port and M12x1.25 rod thread. It generates 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a maximum theoretical force of 128kgf at 1.0MPa. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X900TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X900TC replacement — usually within 7-8 hours.