This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X180SN, 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 SI50X180SN
The AirTAC SI50 Standard Cylinder SI50X180SN 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 SAI50X180SN, 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 → SAI50X180SN
- 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 SI50X180SN
The AirTAC SI50X180SN is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 180 mm stroke. It delivers 982 N push force at 0.5 MPa via a G1/4 port. The direct replacement is the SAI50X180SN, retaining the same interface, output, and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. The NBR seal handles -20 to +70 C, while Viton H extends this. The -S magnet works with CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50X180SN Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X180SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X180SN |
| 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 SAI50X180SN 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 SAI50X180SN 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 SI50X180SN
| 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 SI50X180SN Is Used
Package Diversion
Pushes medium-weight cartons off a main conveyor line using 982 N of thrust at 0.5 MPa without overwhelming the packaging materials.
Pallet Stopper Gate
Acts as a pneumatic stop for incoming pallets on a roller track, absorbing kinetic energy with its 30 mm adjustable air cushions.
Replacing the Airtac SI50 Standard Cylinder SI50X180SN with the SAI50X180SN
To replace the SI50X180SN, order the SAI50X180SN. Verify the ISO 15552 mounting interface, 50 mm bore, 180 mm stroke, G1/4 port, and NBR seal. The -S magnet enables CS1-B/DS1-B sensors. For sizing, the 50 mm bore yields 982 N push at 0.5 MPa; a smaller 40 mm bore offers 628 N, while a 63 mm bore provides 1559 N. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variant. Since the 180 mm stroke is under 300 mm, severe rod-bending side loads are minimal, but guides are still advised for lateral forces.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X180SN
- ✓ 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 SI50X180SN FAQ
Yes, the AirTAC SI50X180SN is discontinued. The direct replacement is the SAI50X180SN. It is dimensionally interchangeable per ISO 15552, matching the 50 mm bore, 180 mm stroke, G1/4 port, and mounting fixtures.
This double-acting cylinder uses a G1/4 air port. At 0.5 MPa it provides 982 N push and 825 N pull force. At 0.7 MPa push is 1374 N, and at 0.9 MPa it is 1767 N. The theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X180SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X180SN replacement — usually within 7-8 hours.