This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X900, 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 SI40X900
The AirTAC Airtac SI40 Standard Cylinder SI40X900 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 SAI40X900, 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 → SAI40X900
- 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 SI40X900
The AirTAC SI40X900 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 900mm stroke. Delivering 628 N push force at 0.5 MPa via a G1/4 port, it is replaced by the SAI40X900. This direct successor matches the exact ISO 15552 mounting interface, bore, stroke, force and port.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This non-magnet SKU cannot accept a sensor, unlike CS1-B/DS1-B equipped versions.
Airtac SI40 Standard Cylinder SI40X900 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X900 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X900 |
| 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 SAI40X900 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 SAI40X900 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 SI40X900
| 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 SI40X900 Is Used
Long-Stroke Material Push
Ideal for diverting packages across a wide conveyor belt using the 900mm stroke and 628 N push force at 0.5 MPa.
Pallet Dispenser
Separates empty pallets in automated storage lines, requiring external guides to manage the 900mm extension safely.
Elevator Gate Control
Actuates heavy safety gates on freight lifts, relying on adjustable air cushions to decelerate at stroke end.
Replacing the Airtac SI40 Standard Cylinder SI40X900 with the SAI40X900
To replace the SI40X900, order the SAI40X900. Confirm the ISO 15552 interface, 40mm bore, 900mm stroke, G1/4 port (PT/G/NPT) and mounting accessory. Because this lacks a magnet (-S), it cannot take a sensor. Sizing both ways: a 32mm bore yields 402 N push at 0.5 MPa, while a 50mm bore yields 982 N. At 900mm, add external guides to prevent rod bending and side loads. The cushion only decelerates; for load holding use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X900
- ✓ 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 SI40X900 FAQ
Yes, the SI40X900 is discontinued. The direct replacement is the SAI40X900. It provides identical ISO 15552 mounting dimensions, 40mm bore, 900mm stroke, output force and G1/4 port, fitting existing fixtures perfectly.
It features a G1/4 port and provides 628 N push / 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a theoretical max of 128 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Request a Quote for the SAI40X900
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X900 replacement — usually within 7-8 hours.