This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X810, 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 SI40X810
The AirTAC Airtac SI40 Standard Cylinder SI40X810 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 810mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X810, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke810 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X810
- 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 SI40X810
The AirTAC SI40X810 is a discontinued double-acting ISO 15552 profile cylinder with an 810 mm stroke, delivering 628 N push force at 0.5 MPa through its G1/4 port. AirTAC replaced it with the SAI40X810, a direct upgrade sharing the exact bore, stroke, force, port and ISO 15552 mounting interface.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this SKU lacks a magnet so cannot take a sensor.
Airtac SI40 Standard Cylinder SI40X810 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X810 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X810 |
| Bore size | Ø40 mm |
| Stroke | 810 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 SAI40X810 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 SAI40X810 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 SI40X810
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×810 | 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 SI40X810 Is Used
Long-Stroke Diversion
Pushes packages across a transfer line using the 810 mm stroke, guided externally to prevent rod bending.
Pneumatic Press
Applies 628 N of push force to seat or lightly stamp components in an assembly fixture.
Replacing the Airtac SI40 Standard Cylinder SI40X810 with the SAI40X810
To replace the SI40X810, order the SAI40X810 and confirm the ISO 15552 mounting interface, 40 mm bore, 810 mm stroke, G1/4 port and M12x1.25 rod thread. Because this SKU lacks the -S magnet, it cannot accept a CS1-B or DS1-B sensor. For sizing, the neighbouring 32 mm bore yields 402 N push at 0.5 MPa, while the 50 mm bore yields 982 N. A plain cylinder drifts on air loss; the cushion only decelerates, so use an external rod lock or pilot check valve for load holding, or specify the SAIL or BSAI lock variant. With an 810 mm stroke, use external guides to prevent rod bending and side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X810
- ✓ 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 SI40X810 FAQ
Yes, the SI40X810 is discontinued. The direct replacement is the SAI40X810, which shares the identical ISO 15552 mounting interface, 40 mm bore, 810 mm stroke, output force and G1/4 port.
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 maximum theoretical force of 128 kgf at 1.0 MPa.
Request a Quote for the SAI40X810
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X810 replacement — usually within 7-8 hours.