This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X720, 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 SI125X720
The AirTAC Airtac SI125 Standard Cylinder SI125X720 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 720mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X720, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke720 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X720
- 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 SI125X720
The AirTAC SI125X720 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 720 mm stroke, delivering 6136 N push force at 0.5 MPa. Its direct replacement is the SAI125X720, matching the G1/2 port, 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. Since this SKU lacks the -S magnet, it cannot accept CS1-B/DS1-B sensors. For load holding, use the SAIL or BSAI lock variants, as cushions only decelerate.
Airtac SI125 Standard Cylinder SI125X720 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X720 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X720 |
| Bore size | Ø125 mm |
| Stroke | 720 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 SAI125X720 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 SAI125X720 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 SI125X720
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×720 | 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 SI125X720 Is Used
Heavy Press Ejection
Provides the 6136 N push at 0.5 MPa needed to eject dense stamped parts from heavy presses, utilizing the 720 mm travel to clear deep tooling beds safely.
Pallet Diversion
Acts as a robust diverter arm on high-mass packaging lines, moving loaded pallets laterally with enough stroke reach to span wide transfer sections.
Vertical Material Lift
Drives multi-tier lifting platforms in automated storage systems, where the 313 kg vertical lift capacity handles substantial tote weights over a 720 mm extension.
Replacing the Airtac SI125 Standard Cylinder SI125X720 with the SAI125X720
To replace the SI125X720, order the SAI125X720 direct: it preserves the ISO 15552 mounting interface, 720 mm stroke, 6136 N output and G1/2 port. Confirm your mounting accessory (LB, FA, TC, etc.) and thread type (PT, G, NPT). This non-magnet SKU cannot take a sensor; order an -S variant if you need CS1-B/DS1-B switches. Sizing both ways: a 100 mm bore gives 3927 N at 0.5 MPa, while a 160 mm bore yields 10053 N. At 720 mm, prevent rod bending by using an external guide to absorb side loads. For suspended loads, add a pilot check valve or specify the SAIL/BSAI lock variant, as standard cushions never hold load on air loss.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X720
- ✓ 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 SI125X720 FAQ
Yes, the SI125X720 is discontinued. The direct replacement is the SAI125X720. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 125 mm bore, 720 mm stroke, force, G1/2 port and mounting accessories.
This double-acting cylinder has a G1/2 air port. It delivers 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 maximum force of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X720
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X720 replacement — usually within 7-8 hours.