This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X80SFTC, 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 SI40X80SFTC
The AirTAC Airtac SI40 Standard Cylinder SI40X80SFTC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 80mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X80SFTC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke80 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X80SFTC
- 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 SI40X80SFTC
The AirTAC SI40X80SFTC is a discontinued double-acting ISO 15552 profile cylinder with an 80 mm stroke. Delivering 628 N push and 528 N pull at 0.5 MPa, it uses a G1/4 port and an M12x1.25 rod thread. AirTAC replaced this legacy unit with the SAI40X80SFTC, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, output force, and FTC trunnion accessory.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line. This -S SKU includes a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X80SFTC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X80SFTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X80SFTC |
| Bore size | Ø40 mm |
| Stroke | 80 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 SAI40X80SFTC 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 SAI40X80SFTC 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 SI40X80SFTC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×80 | 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 SI40X80SFTC Is Used
Package Diverting
Actuates diverter arms on packaging lines, utilizing the 628 N push force to redirect cartons at 30-800 mm/s.
Gate Positioning
Controls material flow gates in distribution hubs, fitting seamlessly into existing ISO 15552 FTC trunnion mounts.
Replacing the Airtac SI40 Standard Cylinder SI40X80SFTC with the SAI40X80SFTC
To replace the SI40X80SFTC, order the SAI40X80SFTC. Verify your ISO 15552 FTC trunnion mount, 40 mm bore, 80 mm stroke, G1/4 port (PT/G/NPT), and the -S magnet for current AirTAC switches. If you need more force, the neighbouring 50 mm bore yields 982 N push at 0.5 MPa; if less is acceptable, the 32 mm bore provides 402 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates near stroke end—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X80SFTC
- ✓ 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 SI40X80SFTC FAQ
Yes, the SI40X80SFTC is discontinued. The direct replacement is the SAI40X80SFTC. It shares the same ISO 15552 mounting interface, 40 mm bore, 80 mm stroke, force, and G1/4 port, fitting existing fixtures perfectly.
This 40 mm bore cylinder features a G1/4 port and provides 628 N push / 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, and a theoretical maximum of 128 kgf at 1.0 MPa. It operates at speeds of 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X80SFTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X80SFTC replacement — usually within 7-8 hours.