This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X240S, 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 SI50X240S
The AirTAC Airtac SI50 Standard Cylinder SI50X240S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 240mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X240S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke240 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X240S
- 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 SI50X240S
The AirTAC SI50X240S is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore, 240mm stroke, and a G1/4 air port. Delivering 982N push force at 0.5MPa, it is replaced by the SAI50X240S, a direct upgrade with the same interface, output, and mounting.
The SAI uses an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SI50X240S includes a piston magnet for CS1-B/DS1-B switches.
Airtac SI50 Standard Cylinder SI50X240S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X240S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X240S |
| Bore size | Ø50 mm |
| Stroke | 240 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 SAI50X240S 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 SAI50X240S 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 SI50X240S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×240 | 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 SI50X240S Is Used
Package Diverting
Actuates routing gates on packaging lines where the 982N push force at 0.5MPa easily deflects medium-weight cartons.
Clamp Actuation
Provides reliable clamping pressure for machining fixtures, utilizing the 825N pull force to secure workpieces.
Replacing the Airtac SI50 Standard Cylinder SI50X240S with the SAI50X240S
To replace the SI50X240S, order the SAI50X240S. It is dimensionally interchangeable per the ISO 15552 mounting interface, keeping the 50mm bore, 240mm stroke, M16x1.5 rod thread, G1/4 port, and 30mm cushions. Retain your mounting accessory (LB, FA, TC, etc.) and confirm the -S magnet for current AirTAC switches. The 240mm stroke is below the 1200mm max, so side-load rod-bending is minimal, but always guide the load. If you need more force, the 63mm bore yields 1559N push at 0.5MPa; if less is needed, the 40mm bore yields 628N. A plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants. The SAIF variant adds a built-in valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X240S
- ✓ 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 SI50X240S FAQ
Yes, the SI50X240S is discontinued. The direct replacement is the SAI50X240S. It shares the same ISO 15552 mounting interface, 50mm bore, 240mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
The G1/4 port bore delivers a push force of 982N and a pull force of 825N at 0.5MPa. At 0.7MPa push is 1374N, and at 0.9MPa it is 1767N. The theoretical maximum force is 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X240S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X240S replacement — usually within 7-8 hours.