This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX1000, 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 SI40AX1000
The AirTAC Airtac SI40 Standard Cylinder SI40AX1000 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1000mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX1000, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1000 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX1000
- 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 SI40AX1000
The AirTAC SI40AX1000 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 1000mm stroke. Delivering 628N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI40AX1000. This direct upgrade matches 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 -A variant uses a SUS420J2 stainless rod, but lacking the -S suffix, it cannot accept a magnetic sensor.
The SAI family also introduces SAIL, SAIF and BSAI lock variants absent in the SI line. Note that a 1000mm stroke requires external guides to prevent rod bending under side loads.
Airtac SI40 Standard Cylinder SI40AX1000 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX1000 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX1000 |
| Bore size | Ø40 mm |
| Stroke | 1000 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 SAI40AX1000 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 SAI40AX1000 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 SI40AX1000
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1000 | 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 SI40AX1000 Is Used
Long-Stroke Diversion
Pushes packages across a 1000mm conveyor lane transfer using the 628N push force at 0.5MPa, guided externally to prevent rod bending.
Vertical Material Lift
Raises light racks up to the 32kg vertical lift limit, requiring a pilot check valve to hold the load safely if air pressure drops.
Stainless Rod Actuation
Drives a humid environment test fixture using the SUS420J2 stainless rod option to resist corrosion over the long 1-meter travel.
Replacing the Airtac SI40 Standard Cylinder SI40AX1000 with the SAI40AX1000
To replace the discontinued SI40AX1000, order the SAI40AX1000. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), the 1000mm stroke, and the G1/4 port. This SKU has no -S magnet, so it cannot support legacy CS1-B/DS1-B sensors; if sensing is needed, specify an SAI with -S. Because this is a 1000mm stroke, use external guides to prevent rod bending from side loads. For higher force, the 50mm bore yields 982N push at 0.5MPa; for lower force, the 32mm bore yields 402N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX1000
- ✓ 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 SI40AX1000 FAQ
Yes, the SI40AX1000 is discontinued. The direct replacement is the SAI40AX1000, which shares the identical ISO 15552 mounting interface, 40mm bore, 1000mm stroke, force, and G1/4 port. You can install it directly into existing fixtures.
It features a G1/4 air port and provides 628N push / 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. The piston rod is 16mm with an M12x1.25 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX1000
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX1000 replacement — usually within 7-8 hours.