This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1590S, 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 SI50X1590S
The AirTAC SI50 Standard Cylinder SI50X1590S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 1590mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X1590S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke1590 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X1590S
- 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 SI50X1590S
The AirTAC SI50X1590S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 1590mm stroke. Generating 982N push force at 0.5MPa, it is replaced direct by the SAI50X1590S. This current SAI model shares the exact G1/4 port, M16x1.5 thread, and mounting interface, but upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure. Note that 1590mm exceeds the 1200mm standard stroke limit, making this a non-standard made-to-order item.
The original SI-S magnet supports CS1-B/DS1-B switches, whereas the SAI replacement uses current AirTAC sensors. Rod material options include carbon steel, SUS420J2, or SUS304, and Viton H seals raise operating temperatures to 150C.
Airtac SI50 Standard Cylinder SI50X1590S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1590S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1590S |
| Bore size | Ø50 mm |
| Stroke | 1590 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 SAI50X1590S 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 SAI50X1590S 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 SI50X1590S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×1590 | 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 SI50X1590S Is Used
Extended Reach Transfer
Pushes components across wide conveyor gaps using the full 1590mm travel, relying on the 982N thrust at 0.5MPa to overcome friction.
High Bay Ejection
Ejects packaged goods from deep storage racking where a standard stroke falls short, utilizing external guides to prevent rod bending.
Replacing the Airtac SI50 Standard Cylinder SI50X1590S with the SAI50X1590S
To replace the SI50X1590S, order the SAI50X1590S direct equivalent, verifying the ISO 15552 mounting interface, G1/4 port, and magnet option. Because 1590mm exceeds the 1200mm standard stroke maximum, expect a non-standard made-to-order configuration. For sizing alternatives, a 40mm bore yields 628N push at 0.5MPa, while a 63mm bore yields 1559N. A plain cylinder does not hold load without live air; the cushion only decelerates. For load holding on air loss, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 1590mm, prevent rod bending by guiding the load externally to avoid side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1590S
- ✓ 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 SI50X1590S FAQ
Yes, the SI50X1590S is discontinued. The direct replacement is the SAI50X1590S. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 1590mm stroke, G1/4 port, and mounting fixtures, but features an upgraded piston seal.
The bore is 50mm with a G1/4 air port. Force output is 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa. The rod is 20mm with an M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1590S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1590S replacement — usually within 7-8 hours.