This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1200S, 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 SI50X1200S
The AirTAC SI50 Standard Cylinder SI50X1200S 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 SAI50X1200S, 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 → SAI50X1200S
- 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 SI50X1200S
The AirTAC SI50X1200S is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore and 1200mm stroke. It delivers 982 N push force at 0.5 MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI50X1200S, a direct upgrade retaining the exact mounting interface, stroke, and output force.
The SAI replacement introduces an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. It also adds lock variants like the SAIL and BSAI absent in the SI line. The original -S magnet supports CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches.
Airtac SI50 Standard Cylinder SI50X1200S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1200S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1200S |
| 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 SAI50X1200S 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 SAI50X1200S 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 SI50X1200S
| 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 SI50X1200S Is Used
Long-Stroke Material Transfer
Pushes workpieces between machining stations over a 1200mm span, utilizing the 982 N thrust class effectively.
High-Bay Ejection
Actuates long-trroke ejection arms on packaging lines, requiring external guides to prevent rod bending.
Replacing the Airtac SI50 Standard Cylinder SI50X1200S with the SAI50X1200S
To replace the SI50X1200S, order the SAI50X1200S and confirm the ISO 15552 interface, 50mm bore, 1200mm stroke, G1/4 port, and mounting accessory. Because this 1200mm stroke exceeds the 50mm bore's 1200mm standard maximum, it is a nonstandard stroke requiring strict alignment to prevent rod bending; use external guides to manage side loads. For sizing alternatives, the neighboring 40mm bore yields 628 N push at 0.5 MPa, while the 63mm bore provides 1559 N. A plain cylinder drifts without live air, so for load holding specify an external pilot check valve, or choose the SAIL/BSAI lock variants. The SAI family also offers the SAIF self-valve option.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1200S
- ✓ 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 SI50X1200S FAQ
Yes, the SI50X1200S is discontinued. The direct replacement is the SAI50X1200S, which shares the identical ISO 15552 mounting interface, 50mm bore, 1200mm stroke, output force, and G1/4 port.
This double-acting cylinder features 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, and a theoretical maximum force of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1200S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1200S replacement — usually within 7-8 hours.