This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X140, 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 SI125X140
The AirTAC SI125 Standard Cylinder SI125X140 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 140mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X140, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke140 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X140
- 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 SI125X140
The AirTAC SI125X140 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 140 mm stroke, delivering 6136 N push force at 0.5 MPa through its G1/2 port. AirTAC replaced this legacy unit with the SAI125X140, a direct upgrade retaining the exact mounting interface, M27x2 rod thread, and 40 mm cushions.
The SAI125X140 features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this specific SKU lacks a magnet, so it cannot accept CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X140 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X140 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X140 |
| Bore size | Ø125 mm |
| Stroke | 140 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 SAI125X140 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 SAI125X140 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 SI125X140
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×140 | 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 SI125X140 Is Used
Heavy Stamping Press
Drives large platens and heavy dies where the 6136 N push force at 0.5 MPa is required for deep drawing or forming operations.
Automated Clamping Rig
Secures large fabricated steel frames during welding, utilizing the 125 mm bore's robust 5734 N pull force.
Replacing the Airtac SI125 Standard Cylinder SI125X140 with the SAI125X140
To replace the SI125X140, order the SAI125X140 with the identical ISO 15552 mounting accessory (LB, FA, CA, TC, etc.), G1/2 port, and M27x2 thread. Because this non-magnet SKU cannot host a sensor, order an -S variant if position detection is needed. For sizing, the 125 mm bore yields 6136 N push at 0.5 MPa; if less force is required, step down to an 80 mm bore (2513 N), or move up to 160 mm (10053 N) for heavier loads. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X140
- ✓ 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 SI125X140 FAQ
Yes, the SI125X140 is discontinued. The direct replacement is the SAI125X140, which shares the identical ISO 15552 mounting interface, 125 mm bore, 140 mm stroke, G1/2 port, and output force.
At 0.5 MPa it provides 6136 N push and 5734 N pull. At 0.7 MPa push is 8590 N, and 11045 N at 0.9 MPa. The theoretical max is 1251 kgf at 1.0 MPa, with an operating speed of 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X140
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X140 replacement — usually within 7-8 hours.