This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X2000S, 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 SI50X2000S
The AirTAC Airtac SI50 Standard Cylinder SI50X2000S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 2000mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X2000S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke2000 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X2000S
- 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 SI50X2000S
The AirTAC SI50X2000S is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 2000 mm stroke. It delivers 982 N push force at 0.5 MPa via a G1/4 port. Because 2000 mm exceeds the 1200 mm standard maximum for this bore, it is a non-standard, made-to-order item. The direct replacement is the SAI50X2000S, which shares the exact same interface, force, and mounting.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. For load holding, note that a plain cylinder drifts without live air; the cushion only decelerates. Use the SAIL lock or BSAI clamp-lock variants if needed. The -S suffix means it has a piston magnet for CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50X2000S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X2000S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X2000S |
| Bore size | Ø50 mm |
| Stroke | 2000 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 SAI50X2000S 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 SAI50X2000S 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 SI50X2000S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×2000 | 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 SI50X2000S Is Used
Long-Stroke Material Transfer
Pushes workpieces between distant machining stations on an automated conveyor line using its 2000 mm reach.
High-Bay Storage Extraction
Extracts totes from deep shelving racks where the 50 kg vertical lift capacity and extended stroke are essential.
Multi-Stage Assembly Pusher
Indexes large fabricated panels through a 2-meter assembly fixture, relying on the 982 N thrust at 0.5 MPa.
Replacing the Airtac SI50 Standard Cylinder SI50X2000S with the SAI50X2000S
To replace the SI50X2000S, order the SAI50X2000S. Confirm the ISO 15552 mounting interface, the 50 mm bore, the 2000 mm non-standard stroke, the G1/4 port, and your mounting accessory (LB, FA, TC, etc.). The -S magnet is required for CS1-B/DS1-B switches. For sizing, the 50 mm bore yields 982 N push at 0.5 MPa; if less force is needed, step down to a 40 mm bore (628 N), or step up to a 63 mm bore (1559 N) for heavier loads. Because the 2000 mm stroke is very long, you must use external guides to prevent rod bending and side-load damage. A plain cylinder does not hold load on air loss; for suspended loads, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X2000S
- ✓ 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 SI50X2000S FAQ
Yes, the SI50X2000S is discontinued. The direct replacement is the SAI50X2000S. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 2000 mm stroke, force, G1/4 port, and mounting fixtures.
This double-acting cylinder features a G1/4 air port and a 20 mm piston rod. It generates 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X2000S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X2000S replacement — usually within 7-8 hours.