This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X180H, 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 SI125X180H
The AirTAC SI125 Standard Cylinder SI125X180H 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 SAI125X180H, 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 → SAI125X180H
- 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 SI125X180H
The AirTAC SI125X180H is a discontinued double-acting ISO 15552 profile cylinder delivering 6136 N push force at 0.5 MPa. It features a 125 mm bore, 180 mm stroke, G1/2 port, and a Viton H high-temperature seal (0 to 150 C). The direct replacement is the SAI125X180H, matching the exact ISO 15552 mounting interface, bore, output force, and porting.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Because this SI SKU lacks a magnet (-S), it cannot accept position sensors.
Airtac SI125 Standard Cylinder SI125X180H Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X180H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X180H |
| 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 SAI125X180H 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 SAI125X180H 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 SI125X180H
| 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 SI125X180H Is Used
Heavy Stamping Press
Drives heavy-duty stamping actuators, utilizing the 6136 N push force at 0.5 MPa to form thick metal components reliably.
Pallet Transfer Unit
Indexes loaded pallets along conveyor lines, where the robust 125 mm bore and 180 mm stroke handle substantial inertia safely.
High-Temp Ejector
Ejects molded parts near hot machinery, leveraging the Viton H seal to withstand ambient temperatures up to 150 C without degrading.
Replacing the Airtac SI125 Standard Cylinder SI125X180H with the SAI125X180H
To replace the SI125X180H, order the SAI125X180H. Verify the ISO 15552 mounting interface, 125 mm bore, 180 mm stroke, G1/2 port, and Viton H seal. This non-magnetic SKU cannot take a CS1-B/DS1-B sensor; if sensing is needed, select an SAI variant with an S suffix. Sizing both ways: the 125 mm bore yields 6136 N push at 0.5 MPa (8590 N at 0.7 MPa), while a neighboring 100 mm bore provides 3927 N at 0.5 MPa. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X180H
- ✓ 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 SI125X180H FAQ
Yes, the SI125X180H is discontinued. The direct replacement is the SAI125X180H. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 180 mm stroke, force, and G1/2 port to fit existing fixtures directly.
The G1/2 port is fixed by the 125 mm bore. At 0.5 MPa it provides 6136 N push and 5734 N pull force. At 0.7 MPa push is 8590 N, and at 0.9 MPa it is 11045 N. The theoretical maximum force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X180H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X180H replacement — usually within 7-8 hours.