This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX180S, 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 SI50AX180S
The AirTAC Airtac SI50 Standard Cylinder SI50AX180S 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 SAI50AX180S, 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 → SAI50AX180S
- 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 SI50AX180S
The AirTAC SI50AX180S is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 180 mm stroke. It features a SUS420J2 stainless piston rod and a built-in magnet for legacy CS1-B/DS1-B switches. Delivering 982 N push force at 0.5 MPa via a G1/4 port, its direct replacement is the SAI50AX180S, which shares the same interface, force, and mounting.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. The SAI family also adds SAIL, SAIF, and BSAI lock variants absent in the SI line, and a Viton H seal option raises operating temps to 150 C.
Airtac SI50 Standard Cylinder SI50AX180S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX180S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX180S |
| 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 SAI50AX180S 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 SAI50AX180S 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 SI50AX180S
| 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 SI50AX180S Is Used
Package Diverting
Actuates diverting arms on packaging lines, utilizing the 180 mm stroke to push cartons cleanly onto adjacent conveyor belts without overshooting.
Pallet Stopper Gate
Functions as a pneumatic stop gate in low-profile pallet handling, where the 982 N force at 0.5 MPa securely halts empty pallets for positioning.
Stainless Rod Clamping
Leverages the SUS420J2 rod and 50 kg vertical lift capacity to clamp and hold light metal components during machining or welding processes.
Replacing the Airtac SI50 Standard Cylinder SI50AX180S with the SAI50AX180S
To replace the SI50AX180S, order the SAI50AX180S. Confirm the ISO 15552 mounting interface, 50 mm bore, 180 mm stroke, G1/4 port (PT/G/NPT thread), and mounting accessory. The -S magnet enables current AirTAC switches, replacing legacy CS1-B/DS1-B sensors. For load holding, note that a plain cylinder drifts without live air; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. If sizing up or down, neighboring bores are 40 mm (628 N push @0.5 MPa) and 63 mm (1559 N push). At 180 mm stroke, side-load and rod-bending risks are low, but ensure guide alignment to prevent premature seal wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX180S
- ✓ 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 SI50AX180S FAQ
Yes, the SI50AX180S is discontinued. The direct replacement is the SAI50AX180S. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 180 mm stroke, G1/4 port, and mounting interface, so it drops directly into existing fixtures.
It uses a G1/4 air port. The force ratings are: 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 maximum of 200 kgf at 1.0 MPa. The rod is 20 mm with an M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX180S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX180S replacement — usually within 7-8 hours.