This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1900S, 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 SI50X1900S
The AirTAC SI50 Standard Cylinder SI50X1900S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 1900mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X1900S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke1900 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X1900S
- 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 SI50X1900S
The AirTAC SI50X1900S is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 1900 mm stroke. Generating 982 N push force at 0.5 MPa, it is replaced by the SAI50X1900S direct equivalent. This successor shares the exact G1/4 port, M16x1.5 rod thread, and mounting interface, dropping straight into existing fixtures.
Because 1900 mm exceeds the 1200 mm standard stroke limit, this is a non-standard made-to-order unit requiring external guides to prevent rod bending. The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure, and adds SAIL, SAIF, and BSAI variants the SI lacked.
Airtac SI50 Standard Cylinder SI50X1900S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1900S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1900S |
| Bore size | Ø50 mm |
| Stroke | 1900 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 SAI50X1900S 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 SAI50X1900S 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 SI50X1900S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×1900 | 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 SI50X1900S Is Used
Long-Reach Diversion
Pushes packages across extended conveyor lanes over a 1900 mm span where 982 N handles lateral routing reliably.
Material Lowering
Lowers components over a long 1.9 m drop, relying on adjustable air cushions to decelerate the load safely.
Replacing the Airtac SI50 Standard Cylinder SI50X1900S with the SAI50X1900S
To replace the SI50X1900S, order the SAI50X1900S. Confirm the ISO 15552 mounting interface, the G1/4 port, and the -S magnet for position sensing. If 1374 N push at 0.7 MPa is insufficient, step up to a 63 mm bore; if 982 N at 0.5 MPa is excessive, a 40 mm bore saves space. Note that 1900 mm exceeds the 1200 mm standard stroke, making it non-standard and requiring external guides to manage side-load and rod-bending on this long stroke. A plain cylinder drifts without live air, so for load holding use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1900S
- ✓ 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 SI50X1900S FAQ
Yes, the SI50X1900S is discontinued. The direct replacement is the SAI50X1900S, which matches the ISO 15552 mounting interface, 50 mm bore, 1900 mm stroke, and G1/4 port.
The 50 mm bore features a G1/4 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1900S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1900S replacement — usually within 7-8 hours.