This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X120, 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 SI40X120
The AirTAC SI40 Standard Cylinder SI40X120 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 120mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X120, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke120 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X120
- 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 SI40X120
The AirTAC SI40X120 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 120mm stroke. Delivering 628N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI40X120. This direct upgrade maintains identical mounting, stroke and force ratings.
The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. For sensing, note this specific SI40X120 lacks a magnet and cannot take a switch. For high heat, Viton H seals raise the temperature limit to 150C.
Airtac SI40 Standard Cylinder SI40X120 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X120 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X120 |
| Bore size | Ø40 mm |
| Stroke | 120 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 SAI40X120 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 SAI40X120 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 SI40X120
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×120 | 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 SI40X120 Is Used
Component Clamping
Secures medium workpieces during machining with 628N of push force at 0.5MPa, ensuring rigid holding without fixture deflection.
Package Diverting
Actuates routing gates on 40mm bore lines, providing positive 120mm strokes to redirect cartons at speeds up to 800mm/s.
Replacing the Airtac SI40 Standard Cylinder SI40X120 with the SAI40X120
To replace the SI40X120, order the SAI40X120 direct: it matches the ISO 15552 mounting interface, 40mm bore, 120mm stroke, G1/4 port and M12x1.25 rod thread. Because this legacy SKU has no magnet (-S), it cannot accept a CS1-B or DS1-B sensor; order an SAI with S if you need position feedback. For sizing, a 32mm bore offers 402N push at 0.5MPa, while a 50mm bore provides 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 SAIF variant integrates a 4M valve if you need self-contained control.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X120
- ✓ 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 SI40X120 FAQ
Yes, the AirTAC SI40X120 is discontinued. The direct replacement is the SAI40X120, which shares the identical ISO 15552 mounting interface, 40mm bore, 120mm stroke, force and G1/4 port.
The 40mm bore features a G1/4 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 theoretical max of 128kgf at 1.0MPa.
Request a Quote for the SAI40X120
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X120 replacement — usually within 7-8 hours.