This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X240, 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 SI125X240
The AirTAC SI125 Standard Cylinder SI125X240 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 240mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X240, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke240 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X240
- 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 SI125X240
The AirTAC SI125X240 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 240 mm stroke. Delivering 6136 N push force at 0.5 MPa via a G1/2 port, it is replaced by the SAI125X240. This direct successor shares the exact interface, M27x2 rod thread, and 40 mm cushions.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. Note this non-magnet SKU cannot take a sensor; legacy CS1-B/DS1-B switches require an -S model.
Airtac SI125 Standard Cylinder SI125X240 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X240 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X240 |
| Bore size | Ø125 mm |
| Stroke | 240 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 SAI125X240 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 SAI125X240 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 SI125X240
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×240 | 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 SI125X240 Is Used
Heavy Pressing
Applies the 6136 N @0.5 MPa thrust for seating heavy machinery components and forming operations.
Pallet Handling
Drives robust 240 mm stroke lifts and pushes for large load transfers in automated distribution hubs.
Mold Clamping
Secures industrial molds using the 125 mm bore class force, relying on stable ISO 15552 fixtures.
Replacing the Airtac SI125 Standard Cylinder SI125X240 with the SAI125X240
To replace the SI125X240, order the SAI125X240 keeping the identical 125 mm bore, 240 mm stroke, G1/2 port, and ISO 15552 mounting. Confirm your thread option (PT/G/NPT) and accessory type (LB, FA, TC, etc.). Because this SKU lacks a magnet, it cannot accept position sensors; if sensing is needed, select an SAI125X240S. Sizing checks: a neighbouring 100 mm bore gives 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. For load holding on air loss, note that a standard cylinder drifts; add an external pilot check valve or choose the SAIL or BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X240
- ✓ 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 SI125X240 FAQ
Yes, the SI125X240 is discontinued. The direct replacement is the SAI125X240, which shares the same ISO 15552 mounting interface, 125 mm bore, 240 mm stroke, output force, G1/2 port, and accessories.
It features a G1/2 port. Force ratings are 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 max of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X240
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X240 replacement — usually within 7-8 hours.