This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X900, 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 SI50X900
The AirTAC Airtac SI50 Standard Cylinder SI50X900 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 900mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X900, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke900 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X900
- 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 SI50X900
The AirTAC SI50X900 is a discontinued double-acting ISO 15552 profile cylinder. Delivering 982 N push at 0.5 MPa through a 50 mm bore and 900 mm stroke, it is replaced by the SAI50X900. This direct successor shares the exact interface, G1/4 port, and 200 kgf max force.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. Note this non-magnet SKU cannot take sensors; legacy CS1-B/DS1-B switches require an -S model.
Airtac SI50 Standard Cylinder SI50X900 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X900 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X900 |
| Bore size | Ø50 mm |
| Stroke | 900 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 SAI50X900 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 SAI50X900 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 SI50X900
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×900 | 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 SI50X900 Is Used
Long-Reach Diversion
Pushes packages across a wide conveyor belt using the 900 mm stroke, relying on the 982 N thrust at 0.5 MPa to overcome friction.
Pallet Handling
Actuates large format gates or stops in pallet flow lines where a true ISO 15552 mounting footprint eases fixture replacement.
Material Lowering
Lowers light platens or covers in assembly cells; external guides are mandatory here to manage the side-load risks of the 900 mm extension.
Replacing the Airtac SI50 Standard Cylinder SI50X900 with the SAI50X900
To replace the SI50X900, order the SAI50X900. Confirm the ISO 15552 mounting interface, 50 mm bore, 900 mm stroke, G1/4 port (PT/G/NPT), and mounting accessory. Because this is a non-S SKU, it cannot accept a magnetic sensor; switch to an SAI50X900S if position detection is needed. At 0.5 MPa it yields 982 N push and 825 N pull; neighbouring bores are 40 mm (628 N) and 63 mm (1559 N). For a 900 mm stroke, use external guides to prevent rod bending and side-load damage. The air cushion only decelerates; it does not hold load. For load holding on air loss, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X900
- ✓ 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 SI50X900 FAQ
Yes, the AirTAC SI50X900 is discontinued. The direct replacement is the SAI50X900. It is dimensionally interchangeable per ISO 15552, matching the 50 mm bore, 900 mm stroke, G1/4 port, and mounting interface.
This double-acting cylinder has 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, 1767 N push at 0.9 MPa, and a theoretical max of 200 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Request a Quote for the SAI50X900
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X900 replacement — usually within 7-8 hours.