This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X180, 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 SI125 Standard Cylinder SI125X180
The AirTAC SI125 Standard Cylinder SI125X180 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 180mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X180, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke180 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X180
- 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 SI125 Standard Cylinder SI125X180
The AirTAC SI125X180 is a discontinued double-acting ISO 15552 profile cylinder featuring an extruded aluminum barrel and a 180 mm stroke. It delivers 6136 N push force at 0.5 MPa through its G1/2 port. AirTAC replaced this legacy unit with the SAI125X180, a direct replacement retaining the exact ISO 15552 mounting interface, bore, and output force.
The SAI upgrade introduces an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note that this specific SKU lacks a magnet (-S), meaning it cannot accept CS1-B/DS1-B legacy sensors.
Airtac SI125 Standard Cylinder SI125X180 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X180 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X180 |
| Bore size | Ø125 mm |
| Stroke | 180 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI125X180 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
The SAI125X180 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI125 Standard Cylinder SI125X180
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | 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 SI125 Standard Cylinder SI125X180 Is Used
Heavy Stamping Press
Drives large platens in automated metal forming, utilizing the 6136 N push force to shape thick gauge materials reliably.
Mold Clamping Fixture
Secures heavy injection molds within large machinery beds, relying on the rigid ISO 15552 profile barrel for stability.
Replacing the Airtac SI125 Standard Cylinder SI125X180 with the SAI125X180
To replace the discontinued SI125X180, order the SAI125X180. Confirm the ISO 15552 mounting interface (LB, FA, TC, etc.), the 180 mm stroke, and the G1/2 port (PT/G/NPT thread options). Since this SKU lacks a magnet, it cannot support position sensing; if switches are needed, specify an SAI125X180S. Sizing context: the neighboring 100 mm bore yields 3927 N push at 0.5 MPa, while the 160 mm bore offers 10053 N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding, specify the SAIL or BSAI lock variant, or use an external pilot check valve. With a 180 mm stroke, standard guide rails should be used to prevent rod bending under offset loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X180
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI125 Standard Cylinder SI125X180 FAQ
Yes, the AirTAC SI125X180 is discontinued. The direct replacement is the SAI125X180. It features the same ISO 15552 mounting interface, 125 mm bore, 180 mm stroke, output force, and G1/2 port, fitting existing fixtures perfectly.
This double-acting cylinder uses a G1/2 air port. It delivers 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N push at 0.9 MPa, and a theoretical maximum of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X180
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X180 replacement — usually within 7-8 hours.