This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX180, 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 SI50AX180
The AirTAC Airtac SI50 Standard Cylinder SI50AX180 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 180mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX180, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke180 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX180
- 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 SI50AX180
The AirTAC SI50AX180 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 180mm stroke, delivering 982N push force at 0.5MPa. The direct replacement is the SAI50AX180, matching the bore, stroke, G1/4 port, and ISO 15552 mounting interface. This SKU features an SUS420J2 stainless steel rod (-A) and lacks a magnet, so it cannot accept a position switch.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. If you need load holding on air loss, the cushion only decelerates; you must use an external pilot check valve or the SAIL/BSAI lock variants.
Airtac SI50 Standard Cylinder SI50AX180 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX180 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX180 |
| Bore size | Ø50 mm |
| Stroke | 180 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 SAI50AX180 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 SAI50AX180 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 SI50AX180
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×180 | 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 SI50AX180 Is Used
Material Diversion
Actuates routing gates on packaging lines using the 982N push force, with the SUS420J2 stainless rod resisting moisture washdown.
Clamp Actuation
Secures aluminium extrusions during machining, relying on the 30mm adjustable air cushions to decelerate the 180mm stroke smoothly.
Replacing the Airtac SI50 Standard Cylinder SI50AX180 with the SAI50AX180
To replace the SI50AX180, order the SAI50AX180. Verify your ISO 15552 mounting fixture (LB, FA, TC, etc.), the 180mm stroke, and the G1/4 port. Because this specific SKU has no magnet, it cannot support legacy CS1-B/DS1-B sensors; if sensing is required, switch to a current AirTAC switch on an SAI model with the -S magnet option. Sizing both ways: the 50mm bore yields 982N push at 0.5MPa (1374N at 0.7MPa); if undersized, the 63mm bore offers 1559N at 0.5MPa. For 180mm stroke applications, side-load and rod-bending forces are moderate, but ensure proper guide alignment to prevent premature seal wear. Note that a plain cylinder drifts without live air; for rigid holding, explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX180
- ✓ 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 SI50AX180 FAQ
Yes, the SI50AX180 is discontinued. The direct replacement is the SAI50AX180. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 180mm stroke, output force, G1/4 port, and mounting interface.
This 50mm bore cylinder features a G1/4 air port and an M16x1.5 rod thread. Force output is 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX180
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX180 replacement — usually within 7-8 hours.