This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X80FTC, 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 SI40X80FTC
The AirTAC Airtac SI40 Standard Cylinder SI40X80FTC 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 SAI40X80FTC, 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 → SAI40X80FTC
- 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 SI40X80FTC
The AirTAC SI40X80FTC is a discontinued double-acting ISO 15552 profile cylinder with an 80 mm stroke and FTC trunnion mount. It delivers 628 N push and 528 N pull at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40X80FTC, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, force and port size.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Because this specific SI SKU lacks the -S magnet, it cannot accept a CS1-B or DS1-B sensor.
Airtac SI40 Standard Cylinder SI40X80FTC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X80FTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X80FTC |
| 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 SAI40X80FTC 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 SAI40X80FTC 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 SI40X80FTC
| 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 SI40X80FTC Is Used
Package Diverting
Uses the FTC trunnion mount to pivot a diverter arm on a packaging line, providing 628 N push at 0.5 MPa to redirect cartons efficiently.
Clamp Actuation
Secures medium-duty workpieces during machining operations, leveraging the 80 mm stroke and M12x1.25 rod thread for precise positioning.
Replacing the Airtac SI40 Standard Cylinder SI40X80FTC with the SAI40X80FTC
To replace the SI40X80FTC, order the SAI40X80FTC keeping the 40 mm bore, 80 mm stroke, G1/4 port and FTC trunnion mount. The SAI family also adds SAIL, SAIF and BSAI lock variants the SI lacked. For load holding, note a plain cylinder drifts on air loss; the cushion only decelerates. Use an external rod lock or pilot check valve. If sizing up, a 50 mm bore offers 982 N push at 0.5 MPa; if sizing down, a 32 mm bore gives 402 N. This SKU has no magnet, so it cannot take a sensor.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X80FTC
- ✓ 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 SI40X80FTC FAQ
Yes, the SI40X80FTC is discontinued. The direct replacement is the SAI40X80FTC. It shares the identical ISO 15552 mounting interface, 40 mm bore, 80 mm stroke, output force, G1/4 port and FTC trunnion mount, fitting existing fixtures perfectly.
This double-acting cylinder has a G1/4 port. It delivers 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a theoretical maximum force of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X80FTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X80FTC replacement — usually within 7-8 hours.