This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX140, 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 SI125AX140
The AirTAC SI125 Standard Cylinder SI125AX140 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 SAI125AX140, 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 → SAI125AX140
- 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 SI125AX140
The AirTAC SI125AX140 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 140 mm stroke. It delivers 6136 N push and 5734 N pull at 0.5 MPa, using a G1/2 port and an M27x2 rod thread. Because this legacy SI unit is end-of-life, you should order the SAI125AX140 direct replacement. It shares the exact ISO 15552 mounting interface, bore, stroke, output force, port size and accessories, fitting existing fixtures perfectly.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This specific SKU has no magnet (-S omitted), so it cannot accept a CS1-B/DS1-B sensor. The -A suffix denotes a SUS420J2 stainless steel rod for corrosion resistance. The SAI family also introduces SAIL, SAIF and BSAI lock variants absent from the SI line.
Airtac SI125 Standard Cylinder SI125AX140 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX140 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX140 |
| 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 SAI125AX140 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 SAI125AX140 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 SI125AX140
| 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 SI125AX140 Is Used
Heavy-Duty Pressing
Drives large stamping and forming presses requiring up to 6136 N of push force at 0.5 MPa, utilizing the 140 mm stroke for deep draw operations.
Pallet Handling
Actuates heavy pallet lifts and transfer carts where the 125 mm bore provides the necessary thrust to move loaded units smoothly on packaging lines.
Automated Clamping
Secures large workpieces in CNC machining cells, taking advantage of the SUS420J2 stainless rod option to resist coolant corrosion in harsh environments.
Replacing the Airtac SI125 Standard Cylinder SI125AX140 with the SAI125AX140
To replace the discontinued SI125AX140, order the SAI125AX140. Verify your ISO 15552 mounting interface (LB, FA, FB, CA, CB, TC), the 140 mm stroke, and the G1/2 port (available in PT, G or NPT). Because this SKU lacks the -S magnet, it cannot support position sensing; if you need switches, order the SAI equivalent with an S suffix for CS1-B/DS1-B compatibility. The -A rod is SUS420J2 stainless steel; choose the blank option if standard carbon steel suffices. Sizing checks: the 125 mm bore yields 6136 N push at 0.5 MPa (8590 N at 0.7 MPa, max 1251 kgf at 1.0 MPa). If you need less force, a 100 mm bore provides 3927 N at 0.5 MPa; for more, the 160 mm bore offers 10053 N. Note that a plain cylinder does not hold load on air loss—the cushion only decelerates. For load holding, specify the SAIL or BSAI lock variant, or use an external rod lock. Speed is 30-500 mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX140
- ✓ 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 SI125AX140 FAQ
Yes, the SI125AX140 is discontinued. The direct replacement is the AirTAC SAI125AX140. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 140 mm stroke, 6136 N force, G1/2 port, and mounting interface.
The G1/2 port bore delivers a push force of 6136 N and a pull force of 5734 N at 0.5 MPa. At 0.7 MPa, the push force 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 SAI125AX140
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX140 replacement — usually within 7-8 hours.