This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX290, 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 SI50AX290
The AirTAC Airtac SI50 Standard Cylinder SI50AX290 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 290mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX290, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke290 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX290
- 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 SI50AX290
The AirTAC SI50AX290 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 290mm stroke. It delivers 982 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI50AX290, matching the bore, stroke, force, port and ISO 15552 mounting interface.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This SKU has no magnet (-S), so it cannot take a CS1-B/DS1-B sensor. The -A code specifies a SUS420J2 stainless steel rod.
Airtac SI50 Standard Cylinder SI50AX290 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX290 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX290 |
| Bore size | Ø50 mm |
| Stroke | 290 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 SAI50AX290 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 SAI50AX290 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 SI50AX290
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×290 | 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 SI50AX290 Is Used
Mid-Force Clamping
Secures workpieces in machining fixtures using 982 N of push force, with the SUS420J2 rod resisting coolant corrosion.
Package Diversion
Actuates 290mm stroke diverting arms on packaging lines, moving goods at 30-800 mm/s without position sensing.
Replacing the Airtac SI50 Standard Cylinder SI50AX290 with the SAI50AX290
To replace the SI50AX290, order the SAI50AX290. Verify the ISO 15552 mounting fixture, G1/4 port, 290mm stroke, and the SUS420J2 stainless rod (-A). Since this SKU lacks a magnet, you cannot mount position sensors; if sensing is needed, switch to an SAI50X290S. Sizing both ways: the 50mm bore yields 982 N push at 0.5 MPa, while the neighbouring 63mm bore offers 1559 N. For 290mm strokes, ensure guide rails to prevent rod bending under side loads. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX290
- ✓ 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 SI50AX290 FAQ
Yes, the SI50AX290 is discontinued. The direct replacement is the SAI50AX290. It is dimensionally interchangeable per ISO 15552, retaining the exact 50mm bore, 290mm stroke, 982 N force, G1/4 port and mounting interface.
The SI50AX290 operates at 30-800 mm/s. 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. It uses a G1/4 port.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX290
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX290 replacement — usually within 7-8 hours.