This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1120, 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 SI40X1120
The AirTAC Airtac SI40 Standard Cylinder SI40X1120 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1120mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X1120, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1120 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X1120
- 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 SI40X1120
The AirTAC SI40X1120 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 1120mm stroke, delivering 628N push force at 0.5MPa. The direct replacement is the SAI40X1120, matching the exact bore, stroke, force, G1/4 port, and mounting interface.
This SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Since this specific SI SKU lacks the -S magnet, it cannot accept a CS1-B/DS1-B sensor. For load holding, the cushion only decelerates; use a SAIL lock or external pilot check valve.
Airtac SI40 Standard Cylinder SI40X1120 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1120 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1120 |
| Bore size | Ø40 mm |
| Stroke | 1120 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 SAI40X1120 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 SAI40X1120 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 SI40X1120
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1120 | 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 SI40X1120 Is Used
Long-Stroke Diversion
Pushes packages across a 1.1-meter conveyor lane using the 628N push force at 0.5 MPa.
Material Extraction
Extracts long extruded profiles from a machining center, relying on the 27mm adjustable cushion.
Replacing the Airtac SI40 Standard Cylinder SI40X1120 with the SAI40X1120
To replace the SI40X1120, order the SAI40X1120, confirming the ISO 15552 interface, 40mm bore, 1120mm stroke, G1/4 port (PT/G/NPT), and mounting accessory. This SKU has no magnet and cannot take a sensor. For sizing alternatives, a 32mm bore offers 402N push @0.5MPa, while a 50mm bore gives 982N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use a SAIL lock, BSAI clamp-lock, or external pilot check valve for held loads. At 1120mm, prevent rod bending by using an external guide to manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1120
- ✓ 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 SI40X1120 FAQ
Yes, the SI40X1120 is discontinued. The direct replacement is the SAI40X1120. It is dimensionally interchangeable per ISO 15552, keeping the same 40mm bore, 1120mm stroke, G1/4 port, and mounting fixtures.
It features a G1/4 port. Force ratings are: 628N push and 528N pull at 0.5 MPa; 879N push at 0.7 MPa; 1130N push at 0.9 MPa; with a theoretical max of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1120
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1120 replacement — usually within 7-8 hours.