This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1440S, 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 SI50X1440S
The AirTAC Airtac SI50 Standard Cylinder SI50X1440S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 1440mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X1440S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke1440 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X1440S
- 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 SI50X1440S
The AirTAC SI50X1440S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 1440mm stroke. Generating 982N push force at 0.5MPa, it is replaced direct by the SAI50X1440S, retaining the same G1/4 port, M16x1.5 rod thread, and mounting interface. Because 1440mm exceeds the 1200mm standard maximum, this is a non-standard made-to-order stroke. The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life.
The -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL, SAIF, and BSAI lock variants. Note that plain cylinders drift without live air; the cushion only decelerates.
Airtac SI50 Standard Cylinder SI50X1440S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1440S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1440S |
| Bore size | Ø50 mm |
| Stroke | 1440 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 SAI50X1440S 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 SAI50X1440S 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 SI50X1440S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×1440 | 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 SI50X1440S Is Used
Long-Stroke Transfer
Pushes workpieces between machining stations over a 1440mm span, utilizing the 982N push force at 0.5MPa to move moderate loads efficiently.
High-Bay Ejection
Extends to eject packaged goods from deep racking, requiring external guides to support the extended rod and prevent binding over the long travel.
Replacing the Airtac SI50 Standard Cylinder SI50X1440S with the SAI50X1440S
To replace the SI50X1440S, order the SAI50X1440S direct, confirming the ISO 15552 interface, G1/4 port, and -S magnet for current AirTAC switches. Since 1440mm is non-standard, verify lead times. For long 1440mm strokes, use external guides to prevent rod bending and side-load damage. If sizing up, the 63mm bore yields 1559N push at 0.5MPa; sizing down, the 40mm bore yields 628N. The cushion only decelerates; for load holding on air loss, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1440S
- ✓ 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 SI50X1440S FAQ
Yes, the SI50X1440S is discontinued. The direct replacement is the SAI50X1440S. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 1440mm stroke, 982N force, G1/4 port, and mounting accessories.
The 50mm bore features a 20mm rod, M16x1.5 thread, G1/4 port, and 30-800mm/s speed. Forces are 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a 200kgf theoretical max at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1440S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1440S replacement — usually within 7-8 hours.