This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X150SFTC, 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 SI50 Standard Cylinder SI50X150SFTC
The AirTAC Airtac SI50 Standard Cylinder SI50X150SFTC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 150mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X150SFTC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke150 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X150SFTC
- 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 SI50 Standard Cylinder SI50X150SFTC
The AirTAC SI50X150SFTC is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 150 mm stroke. Delivering 982 N push force at 0.5 MPa through a G1/4 port, it is directly replaced by the SAI50X150SFTC. This direct upgrade shares the exact same interface, FTC trunnion mount, and M16x1.5 rod thread. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
The original SI-S magnet supports legacy CS1-B/DS1-B sensors, whereas the SAI uses current AirTAC switches. If high temperatures are required, both series offer a Viton H seal option raising the operating range to 0-150 C.
Airtac SI50 Standard Cylinder SI50X150SFTC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X150SFTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X150SFTC |
| Bore size | Ø50 mm |
| Stroke | 150 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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, 30 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI50X150SFTC carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The SAI50X150SFTC produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI50 Standard Cylinder SI50X150SFTC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×150 | 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 SI50 Standard Cylinder SI50X150SFTC Is Used
Package Diversion
Pushes 50 kg cartons at 90 degrees on sorting lines using the 150 mm stroke and 982 N thrust.
Pallet Stop Gate
Acts as a pneumatic stop for lightweight pallets, utilizing the FTC trunnion mount for pivot action.
Vertical Pressing
Applies downward clamping pressure up to 589 N safely, with adjustable cushions for end-of-stroke deceleration.
Replacing the Airtac SI50 Standard Cylinder SI50X150SFTC with the SAI50X150SFTC
To replace the SI50X150SFTC, order the SAI50X150SFTC to retain the exact ISO 15552 dimensions, 150 mm stroke, G1/4 port, and FTC trunnion mounting. If downsizing, the 40 mm bore yields 628 N push at 0.5 MPa; if upsizing, the 63 mm bore provides 1559 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates near stroke ends. For load holding, use an external pilot check valve or explore the SAIL (air-released lock) or BSAI (clamp-lock) variants. The SAIF variant integrates a 4M valve if self-actuation is needed.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X150SFTC
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI50 Standard Cylinder SI50X150SFTC FAQ
Yes, the SI50X150SFTC is discontinued. The direct replacement is the SAI50X150SFTC. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 150 mm stroke, G1/4 port, and FTC mounting interface.
This double-acting cylinder features a G1/4 air port. It delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum force of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X150SFTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X150SFTC replacement — usually within 7-8 hours.