This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X90CA, 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 SI50X90CA
The AirTAC Airtac SI50 Standard Cylinder SI50X90CA 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 SAI50X90CA, 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 → SAI50X90CA
- 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 SI50X90CA
The AirTAC SI50X90CA is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 90mm stroke, delivering 982N push force at 0.5MPa via a G1/4 port. It is replaced by the SAI50X90CA direct, which maintains the exact ISO 15552 mounting interface, CA clevis, and output force.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. Note this SKU lacks a magnet and cannot take a CS1-B/DS1-B sensor.
Airtac SI50 Standard Cylinder SI50X90CA Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X90CA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X90CA |
| 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 SAI50X90CA 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 SAI50X90CA 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 SI50X90CA
| 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 SI50X90CA Is Used
Carton Diverting
Uses the 90mm stroke and CA clevis to push packages off a belt line with 982N push force at 0.5MPa.
Clamp Actuation
Secures workpieces during machining, relying on the 825N pull force at 0.5MPa to hold the retracted tooling.
Pallet Stopper
Acts as a pneumatic stop for incoming pallets, absorbing impact using the 30mm adjustable air cushions.
Replacing the Airtac SI50 Standard Cylinder SI50X90CA with the SAI50X90CA
To replace the SI50X90CA, order the SAI50X90CA to get the identical ISO 15552 interface, 50mm bore, 90mm stroke, G1/4 port, and CA clevis mount. If sizing up or down, neighbouring bores are 40mm (628N push) and 63mm (1559N push) at 0.5MPa. Because this non-magnetic SKU cannot accept a CS1-B/DS1-B sensor, add the -S suffix if position detection is needed. A plain cylinder drifts on air loss—the cushion only decelerates—so use a pilot check valve, external rod lock, or the SAIL/BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X90CA
- ✓ 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 SI50X90CA FAQ
Yes, the SI50X90CA is discontinued. The direct replacement is the SAI50X90CA. It shares the same ISO 15552 mounting interface, 50mm bore, 90mm stroke, G1/4 port, and CA clevis, fitting existing fixtures perfectly.
The G1/4 port feeds the 20mm rod to generate 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X90CA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X90CA replacement — usually within 7-8 hours.