This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX700, 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 SI125AX700
The AirTAC SI125 Standard Cylinder SI125AX700 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 700mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX700, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke700 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX700
- 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 SI125AX700
The AirTAC SI125AX700 is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel and a SUS420J2 stainless piston rod. Delivering 6136 N push force at 0.5 MPa, it features a 125 mm bore, 700 mm stroke, and a G1/2 air port.
The direct replacement is the SAI125AX700, retaining the exact ISO 15552 mounting interface, bore, force, and stroke. The SAI upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. Note this SKU lacks a magnet and cannot take a sensor.
Airtac SI125 Standard Cylinder SI125AX700 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX700 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX700 |
| Bore size | Ø125 mm |
| Stroke | 700 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 SAI125AX700 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 SAI125AX700 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 SI125AX700
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×700 | 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 SI125AX700 Is Used
Heavy Press Ejection
Drives large stamping presses, using the 6136 N push force at 0.5 MPa to reliably eject dense metal parts from heavy dies.
Pallet Diverting
Actuates long-throw diverters in high-throughput logistics lines, with the 700 mm stroke reaching across wide conveyor lanes.
Large Mold Handling
Shifts heavy injection molds into and out of processing machines, leveraging the SUS420J2 stainless rod for moisture resistance.
Replacing the Airtac SI125 Standard Cylinder SI125AX700 with the SAI125AX700
To replace this SI125AX700, order the SAI125AX700 and confirm the ISO 15552 mounting interface, 125 mm bore, 700 mm stroke, G1/2 port, and SUS420J2 rod. Because this is a 700 mm stroke, add external guides to prevent rod bending and side-load wear. Sizing both ways: a 100 mm bore yields 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. This non-magnet SKU cannot accept CS1-B/DS1-B sensors.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX700
- ✓ 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 SI125AX700 FAQ
Yes, the SI125AX700 is discontinued. The direct replacement is the SAI125AX700, which shares the same ISO 15552 mounting interface, 125 mm bore, 700 mm stroke, output force, and G1/2 port.
It has a G1/2 air 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. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX700
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX700 replacement — usually within 7-8 hours.