This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X720S, 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 SI50X720S
The AirTAC Airtac SI50 Standard Cylinder SI50X720S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 720mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X720S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke720 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X720S
- 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 SI50X720S
The AirTAC SI50X720S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 720mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50X720S, which matches the interface, stroke, and force exactly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. The SAI family also adds SAIL and BSAI lock variants the SI lacked.
Airtac SI50 Standard Cylinder SI50X720S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X720S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X720S |
| Bore size | Ø50 mm |
| Stroke | 720 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 SAI50X720S 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 SAI50X720S 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 SI50X720S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×720 | 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 SI50X720S Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the full 720mm extension, relying on the 982N thrust at 0.5MPa to overcome friction.
Pneumatic Press Ejection
Cycles finished parts out of a press area, taking advantage of the adjustable 30mm air cushions at both ends to decelerate the load.
Replacing the Airtac SI50 Standard Cylinder SI50X720S with the SAI50X720S
To replace the SI50X720S, order the SAI50X720S keeping the same ISO 15552 mounting, 50mm bore, 720mm stroke, G1/4 port, and -S magnet for CS1-B/DS1-B switches. If you need more force, the 63mm bore offers 1559N push at 0.5MPa; if less, the 40mm bore gives 628N. Because this is a 720mm stroke, use external guides to prevent rod bending and side-load damage. A plain cylinder drifts on air loss; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X720S
- ✓ 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 SI50X720S FAQ
Yes, the SI50X720S is discontinued. The direct replacement is the SAI50X720S. It is dimensionally interchangeable per the ISO 15552 mounting interface, maintaining the same 50mm bore, 720mm stroke, output force, G1/4 port, and mounting accessories.
This 50mm bore double-acting cylinder has a G1/4 air port. The thrust is 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical maximum of 200kgf at 1.0MPa. It operates at 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X720S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X720S replacement — usually within 7-8 hours.