This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X730S, 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 SI50X730S
The AirTAC SI50 Standard Cylinder SI50X730S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 730mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X730S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke730 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X730S
- 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 SI50X730S
The AirTAC SI50X730S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 730mm stroke. Delivering 982N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI50X730S. This direct successor shares identical ISO 15552 mounting dimensions, bore, stroke, and output force, fitting existing fixtures perfectly.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. For this 730mm stroke, use external guides to prevent rod bending. The SI50X730S includes a magnet for CS1-B/DS1-B switches; the SAI uses current AirTAC switches. Viton H seals raise temperatures to 150C.
Airtac SI50 Standard Cylinder SI50X730S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X730S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X730S |
| Bore size | Ø50 mm |
| Stroke | 730 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 SAI50X730S 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 SAI50X730S 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 SI50X730S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×730 | 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 SI50X730S Is Used
Long-Stroke Diversion
Pushes packages across transfer lines with a 730mm reach, utilizing the 982N force class while requiring external guide rails to absorb side loads.
Automated Press Clamping
Secures workpieces in machining cells where the 50mm bore provides steady clamping, with the G1/4 port ensuring responsive actuation.
Replacing the Airtac SI50 Standard Cylinder SI50X730S with the SAI50X730S
To replace the SI50X730S, order the SAI50X730S. Verify the ISO 15552 mounting interface, 50mm bore, 730mm stroke, G1/4 port (PT/G/NPT thread), and mounting accessory. The -S denotes a piston magnet for legacy CS1-B/DS1-B sensors; the SAI replacement accepts current AirTAC switches. Sizing both ways: a 63mm bore yields 1559N push at 0.5MPa, while a 40mm bore yields 628N. At 730mm, add external guides to prevent rod bending. 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.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X730S
- ✓ 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 SI50X730S FAQ
Yes, the SI50X730S is discontinued. The direct replacement is the SAI50X730S. It shares the same ISO 15552 mounting interface, 50mm bore, 730mm stroke, output force, and G1/4 port, fitting directly into existing fixtures.
The 50mm bore uses a G1/4 air port. Force ratings are 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical maximum of 200kgf at 1.0MPa. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X730S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X730S replacement — usually within 7-8 hours.