This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X356, 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 SI50X356
The AirTAC Airtac SI50 Standard Cylinder SI50X356 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 356mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X356, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke356 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X356
- 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 SI50X356
The AirTAC SI50X356 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 356mm stroke. It delivers 982N push and 825N pull at 0.5MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI50X356, a direct sharing the exact interface, force, and mounting.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. Note this nonstandard 356mm stroke needs external guides to prevent rod bending. This no-magnet SKU cannot take a sensor.
Airtac SI50 Standard Cylinder SI50X356 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X356 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X356 |
| Bore size | Ø50 mm |
| Stroke | 356 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 SAI50X356 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 SAI50X356 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 SI50X356
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×356 | 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 SI50X356 Is Used
Carton Diverting
Pushes packages at 30-800mm/s on packaging lines where the 982N thrust easily redirects standard loads.
Pallet Gauging
Positions pallets using the 356mm travel, requiring external guides to absorb deflection during heavy stops.
Fixture Ejection
Ejects machined parts from fixtures using the 50kg safe vertical lift capacity at 0.5MPa operating pressure.
Replacing the Airtac SI50 Standard Cylinder SI50X356 with the SAI50X356
To replace this SI50X356, order the SAI50X356. Confirm the ISO 15552 mounting interface, G1/4 port, and M16x1.5 rod thread. Because this is a nonstandard 356mm stroke exceeding standard lengths, add external guides to prevent rod bending under side loads. If you need load holding on air loss, note the plain cylinder drifts; specify an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. For higher force, the 63mm bore yields 1559N push at 0.5MPa; for less, the 40mm bore gives 628N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X356
- ✓ 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 SI50X356 FAQ
Yes, the AirTAC SI50X356 is discontinued. The direct replacement is the SAI50X356. It shares the exact ISO 15552 mounting interface, 50mm bore, 356mm stroke, force, and G1/4 port, fitting existing fixtures perfectly.
The 50mm bore uses a G1/4 port. It delivers 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa. Operating speed is 30-800mm/s.
Request a Quote for the SAI50X356
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X356 replacement — usually within 7-8 hours.