This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1230S, 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 SI50X1230S
The AirTAC Airtac SI50 Standard Cylinder SI50X1230S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 1230mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X1230S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke1230 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X1230S
- 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 SI50X1230S
The AirTAC SI50X1230S is a discontinued double-acting ISO 15552 profile cylinder featuring a 50 mm bore, G1/4 port, and a 1230 mm stroke. Because 1230 mm exceeds the 1200 mm standard stroke limit for this bore, it was produced as a non-standard made-to-order unit. It delivers 982 N push force at 0.5 MPa.
You must replace it with the SAI50X1230S. This current-production direct retains the exact ISO 15552 mounting interface, bore, stroke, force, and port. The SAI upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure and long life. The SI's built-in magnet supports legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches.
Airtac SI50 Standard Cylinder SI50X1230S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1230S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1230S |
| Bore size | Ø50 mm |
| Stroke | 1230 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 SAI50X1230S 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 SAI50X1230S 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 SI50X1230S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×1230 | 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 SI50X1230S Is Used
Extended-Reach Transfer
Pushes products across wide conveyor gaps using the full 1230 mm stroke, relying on external guides to prevent rod bending during the long traverse.
High-Bay Ejection
Ejects totes from deep storage racking where 982 N of push force at 0.5 MPa is sufficient to clear the shelf onto a takeaway lane.
Replacing the Airtac SI50 Standard Cylinder SI50X1230S with the SAI50X1230S
To replace the SI50X1230S, order the SAI50X1230S to get the identical ISO 15552 interface, 50 mm bore, 1230 mm stroke, M16x1.5 rod thread, and G1/4 port. Retain your existing mounting accessory and confirm the PT, G, or NPT thread standard. Because 1230 mm exceeds the 1200 mm standard maximum, specify this as a non-standard made-to-order stroke. For sizing, neighboring bores offer different forces: a 40 mm bore gives 628 N push at 0.5 MPa, while a 63 mm bore gives 1559 N. At 1230 mm, this cylinder is highly susceptible to side-load and rod-bending; always use external guides to prevent premature seal failure. A plain cylinder does not hold load on air loss—the cushion only decelerates. For load holding, use an external rod lock, a pilot check valve, or the SAIL (air-released lock) and BSAI (clamp-lock) variants. The SAIF variant adds a built-in 4M valve for bores 32-100.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1230S
- ✓ 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 SI50X1230S FAQ
Yes, the SI50X1230S is discontinued. The direct replacement is the SAI50X1230S. It is dimensionally interchangeable per the ISO 15552 mounting interface, matching the 50 mm bore, 1230 mm stroke, G1/4 port, and output force so it fits existing fixtures.
The G1/4 port bore delivers a push force of 982 N and a pull force of 825 N at 0.5 MPa. At 0.7 MPa push is 1374 N, and at 0.9 MPa it is 1767 N. The theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1230S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1230S replacement — usually within 7-8 hours.