This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1200, 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 SI50X1200
The AirTAC Airtac SI50 Standard Cylinder SI50X1200 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 1200mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X1200, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke1200 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X1200
- 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 SI50X1200
The AirTAC SI50X1200 is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 1200 mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa through a G1/4 port. The direct replacement is the SAI50X1200, matching the interface, force and M16x1.5 rod thread.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. This non-magnet SKU cannot take a sensor, unlike the CS1-B/DS1-B used on -S models. For high heat, Viton H seals raise the limit to 150 C.
Airtac SI50 Standard Cylinder SI50X1200 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1200 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1200 |
| Bore size | Ø50 mm |
| Stroke | 1200 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 SAI50X1200 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 SAI50X1200 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 SI50X1200
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×1200 | 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 SI50X1200 Is Used
Long-Stroke Material Transfer
Moves packages between distant workstations using the full 1200 mm travel, relying on external guides to support the extended rod.
High-Bay Pusher Arm
Actuates a pushing mechanism to transfer goods vertically or horizontally into storage racks with 982 N of thrust.
Automated Door Operation
Opens and closes large industrial machine guard doors, utilizing the double-acting profile cylinder for reliable motion.
Replacing the Airtac SI50 Standard Cylinder SI50X1200 with the SAI50X1200
To replace the SI50X1200, order the SAI50X1200 and confirm the ISO 15552 mounting interface, 50 mm bore, 1200 mm stroke and G1/4 port. Because this 1200 mm stroke exceeds 300 mm, use an external guide to prevent rod bending and side-load damage. This non-magnet version cannot accept a sensor. For sizing, the 40 mm bore yields 628 N push at 0.5 MPa, while the 63 mm bore yields 1559 N. The cushion only decelerates; it does not hold load on air loss, so use an external rod lock or the SAIL/BSAI lock variant for holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1200
- ✓ 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 SI50X1200 FAQ
Yes, the SI50X1200 is discontinued. The direct replacement is the AirTAC SAI50X1200. It is dimensionally interchangeable per ISO 15552, matching the 50 mm bore, 1200 mm stroke, output force, G1/4 port and mounting accessories.
The 50 mm bore uses a G1/4 port. Theoretical forces are 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a maximum of 200 kgf at 1.0 MPa. The piston rod is 20 mm with an M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1200
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1200 replacement — usually within 7-8 hours.