This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X180SFTC, 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 SI40X180SFTC
The AirTAC SI40 Standard Cylinder SI40X180SFTC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 180mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X180SFTC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke180 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X180SFTC
- 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 SI40X180SFTC
The AirTAC SI40X180SFTC is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 180 mm stroke. It delivers 628 N push and 528 N pull at 0.5 MPa, utilizing a G1/4 port and an M12x1.25 rod thread. AirTAC replaced this legacy unit with the SAI40X180SFTC, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, and force ratings.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces lock and valve variants (SAIL, SAIF, BSAI) absent in the SI line, and the built-in magnet on this -S model supports legacy CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X180SFTC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X180SFTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X180SFTC |
| Bore size | Ø40 mm |
| Stroke | 180 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 SAI40X180SFTC 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 SAI40X180SFTC 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 SI40X180SFTC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×180 | 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 SI40X180SFTC Is Used
Package Diversion
Ideal for pushing lightweight to medium cartons off a main conveyor line, utilizing the 628 N push force and 180 mm travel to clear the transport path efficiently.
Pallet Stop Gate
Acts as a pneumatic stop for pallets entering a wrapping station, where the FTC trunnion mount handles the offset load and the 180 mm stroke retracts clear of the fork path.
Component Clamping
Secures aluminum housings during CNC machining, providing reliable 528 N pull force to hold the fixture firmly against vibration without deforming the workpiece.
Replacing the Airtac SI40 Standard Cylinder SI40X180SFTC with the SAI40X180SFTC
To replace the SI40X180SFTC, order the SAI40X180SFTC. Verify your ISO 15552 FTC trunnion mount, 40 mm bore, 180 mm stroke, G1/4 port (PT/G/NPT thread options), and the -S magnet for CS1-B/DS1-B switches. For higher force, the neighboring 50 mm bore yields 982 N push at 0.5 MPa; for lighter loads, the 32 mm bore provides 402 N. Remember that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding. At 180 mm stroke, rod bending stress is minimal, but always guide the load to prevent side-loading.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X180SFTC
- ✓ 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 SI40X180SFTC FAQ
Yes, the SI40X180SFTC is discontinued. The direct replacement is the SAI40X180SFTC. It shares the identical ISO 15552 mounting interface, 40 mm bore, 180 mm stroke, G1/4 port, and output force, fitting directly into existing fixtures.
The cylinder operates at 0.15-1.0 MPa (proof 1.5 MPa) with a speed of 30-800 mm/s. Force output is 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 max of 128 kgf at 1.0 MPa. It features a 16 mm rod, M12x1.25 thread, and 27 mm cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X180SFTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X180SFTC replacement — usually within 7-8 hours.