This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1020S, 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 SI40X1020S
The AirTAC Airtac SI40 Standard Cylinder SI40X1020S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1020mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X1020S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1020 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X1020S
- 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 SI40X1020S
The AirTAC SI40X1020S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 1020 mm stroke. Delivering 628 N push force at 0.5 MPa, it is replaced by the SAI40X1020S. This direct upgrade retains the exact G1/4 port, M12x1.25 rod thread, and ISO 15552 mounting interface for existing fixtures.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked. This -S model uses CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X1020S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1020S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1020S |
| Bore size | Ø40 mm |
| Stroke | 1020 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 SAI40X1020S 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 SAI40X1020S 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 SI40X1020S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1020 | 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 SI40X1020S Is Used
Long-Stroke Material Transfer
Pushes workpieces between processing stations on an assembly line, utilizing the 1020 mm travel distance to span wide machinery gaps.
Vertical Package Elevation
Lifts goods up to 32 kg in sorting facilities, relying on the 628 N push force at 0.5 MPa to raise items between conveyor tiers.
Automated Clamp Actuation
Drives remote clamping mechanisms in large fixture setups, where the G1/4 port and 40 mm bore provide steady 528 N pull force.
Replacing the Airtac SI40 Standard Cylinder SI40X1020S with the SAI40X1020S
To replace the SI40X1020S, order the SAI40X1020S. Confirm the ISO 15552 mounting interface, the 40 mm bore, the 1020 mm stroke, the G1/4 port (PT/G/NPT), and the -S magnet for CS1-B/DS1-B switches. Because 1020 mm exceeds the 1200 mm max standard stroke, verify dimensions. Sizing both ways: a 32 mm bore yields 402 N push at 0.5 MPa, while a 50 mm bore yields 982 N. A plain cylinder does not hold load without live air; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. For this 1020 mm stroke, use external guides to prevent rod bending and side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1020S
- ✓ 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 SI40X1020S FAQ
Yes, the SI40X1020S is discontinued. The direct replacement is the AirTAC SAI40X1020S. It is dimensionally interchangeable per ISO 15552, retaining the same 40 mm bore, 1020 mm stroke, G1/4 port, and mounting interface.
The G1/4 port bore delivers 628 N push and 528 N pull at 0.5 MPa. At 0.7 MPa push is 879 N, at 0.9 MPa it is 1130 N, and the theoretical max is 128 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1020S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1020S replacement — usually within 7-8 hours.