This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X200SFTC, 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 SI40X200SFTC
The AirTAC SI40 Standard Cylinder SI40X200SFTC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 200mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X200SFTC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke200 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X200SFTC
- 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 SI40X200SFTC
The AirTAC SI40X200SFTC is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore, 200 mm stroke, FTC trunnion mount, and a G1/4 air port. Delivering 628 N push force at 0.5 MPa, it is replaced by the SAI40X200SFTC. This direct successor shares the exact ISO 15552 mounting interface, bore, stroke, output force, and port size, fitting existing fixtures perfectly.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The original SI magnet (-S) supported CS1-B/DS1-B sensors, while the SAI family uses current AirTAC switches. The SAI line also adds SAIL, SAIF, and BSAI lock variants absent in the SI series.
Airtac SI40 Standard Cylinder SI40X200SFTC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X200SFTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X200SFTC |
| Bore size | Ø40 mm |
| Stroke | 200 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 SAI40X200SFTC 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 SAI40X200SFTC 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 SI40X200SFTC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×200 | 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 SI40X200SFTC Is Used
Component Clamping
Secures medium-weight machined parts during milling or drilling, utilizing the 628 N push force at 0.5 MPa to hold firm against cutting vibration.
Package Diverting
Actuates sorting arms on packaging lines to push 200 mm strokes, redirecting cartons at speeds up to 800 mm/s without lagging the throughput.
Pallet Stopper Gates
Controls pallet flow on roller conveyors by raising and lowering stop gates, safely handling loads up to the 32 kg vertical lift threshold.
Replacing the Airtac SI40 Standard Cylinder SI40X200SFTC with the SAI40X200SFTC
To replace the SI40X200SFTC, order the SAI40X200SFTC to retain the 40 mm bore, 200 mm stroke, G1/4 port, M12x1.25 rod thread, and FTC trunnion mounting interface. When sizing, verify force in both directions: the 40 mm bore yields 628 N push and 528 N pull at 0.5 MPa, while the neighboring 50 mm bore provides 982 N push if you need more power. The 200 mm stroke is well under the 1200 mm maximum, so standard side-load risks are low, but always guide the rod for lateral stability. Because a standard cylinder does not hold load without live air, use an external pilot check valve or the SAIL/BSAI lock variant for vertical loads. The included magnet (-S) supports CS1-B/DS1-B switches on the SI, and current AirTAC switches on the SAI.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X200SFTC
- ✓ 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 SI40X200SFTC FAQ
Yes, the SI40X200SFTC is discontinued. The direct replacement is the SAI40X200SFTC. It shares the identical ISO 15552 mounting interface, 40 mm bore, 200 mm stroke, output force, G1/4 port, and FTC trunnion mount, so it drops directly into existing machinery.
The 40 mm bore features a G1/4 air port and a 16 mm rod. 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 of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X200SFTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X200SFTC replacement — usually within 7-8 hours.