This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX90S, 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 SI50AX90S
The AirTAC Airtac SI50 Standard Cylinder SI50AX90S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 90mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX90S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke90 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX90S
- 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 SI50AX90S
The AirTAC SI50AX90S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 90mm stroke. It delivers 982 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI50AX90S, a direct upgrade retaining the exact ISO 15552 mounting interface, M16x1.5 rod thread, and 30mm cushions.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This -A variant uses a SUS420J2 stainless steel rod, and the -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50AX90S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX90S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX90S |
| Bore size | Ø50 mm |
| Stroke | 90 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 SAI50AX90S 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 SAI50AX90S 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 SI50AX90S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×90 | 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 SI50AX90S Is Used
Package Diversion
Ideal for 90mm stroke diverting arms on packaging lines, providing positive 982 N push action at 0.5 MPa to redirect cartons without lag.
Clamp Actuation
Suitable for mid-force clamping stations in CNC machining, where the SUS420J2 stainless rod offers splash resistance against cutting fluids.
Stopper Gate
Deploys a 90mm stopper blade on material handling conveyors, reliably halting pallets up to the 50 kg vertical lift threshold.
Replacing the Airtac SI50 Standard Cylinder SI50AX90S with the SAI50AX90S
To replace the SI50AX90S, order the SAI50AX90S. Confirm the ISO 15552 mounting interface, 50mm bore, 90mm stroke, G1/4 port (PT/G/NPT thread), and your specific mounting accessory. The -S magnet enables CS1-B/DS1-B sensors (the SAI uses current AirTAC switches), while the -A rod is SUS420J2 stainless steel. Sizing both ways: if you need more force, the 63mm bore offers 1559 N at 0.5 MPa; if less, the 40mm bore provides 628 N. Remember, 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 variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX90S
- ✓ 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 SI50AX90S FAQ
Yes, the SI50AX90S is discontinued. The direct replacement is the SAI50AX90S. It shares the identical ISO 15552 mounting interface, 50mm bore, 90mm stroke, output force, G1/4 port, and accessories, fitting existing fixtures perfectly.
The 50mm bore delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical max of 200 kgf at 1.0 MPa. Operating speed is 30-800 mm/s. It uses a G1/4 port and M16x1.5 rod thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX90S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX90S replacement — usually within 7-8 hours.