This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1200STC, 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 SI50X1200STC
The AirTAC SI50 Standard Cylinder SI50X1200STC 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 SAI50X1200STC, 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 → SAI50X1200STC
- 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 SI50X1200STC
The AirTAC SI50X1200STC is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 1200mm stroke. Delivering 982 N push force at 0.5 MPa, it features a G1/4 port, M16x1.5 rod thread, and a TC trunnion mount. The direct replacement is the SAI50X1200STC, which shares the same interface, force, and porting.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked. Your -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches.
Airtac SI50 Standard Cylinder SI50X1200STC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1200STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1200STC |
| 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 SAI50X1200STC 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 SAI50X1200STC 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 SI50X1200STC
| 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 SI50X1200STC Is Used
Long-Stroke Diversion
Drives large package pushers across wide conveyor belts using the 1200mm stroke and 982 N force.
High-Bay Extraction
Extracts pallets from deep racking where the TC trunnion accommodates pivotal load shifts.
Material Lowering
Lowers 50 kg workpieces vertically, relying on external guides to prevent rod bending over 1200mm.
Replacing the Airtac SI50 Standard Cylinder SI50X1200STC with the SAI50X1200STC
To replace this SI50X1200STC, order the SAI50X1200STC keeping the 50mm bore, 1200mm stroke, TC trunnion mount, and -S magnet. Verify your G1/4 port and M16x1.5 thread. The ISO 15552 mounting dimensions ensure a direct. Sizing both ways: a 63mm bore offers 1559 N push at 0.5 MPa, while a 40mm bore gives 628 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 1200mm, prevent rod bending by using an external guide to manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1200STC
- ✓ 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 SI50X1200STC FAQ
Yes, the SI50X1200STC is discontinued. The direct replacement is the SAI50X1200STC. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 1200mm stroke, TC mount, G1/4 port, and 982 N force.
The G1/4 port bore delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical max of 200 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa with a 30-800 mm/s speed range.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1200STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1200STC replacement — usually within 7-8 hours.