This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X700H, 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 SI125X700H
The AirTAC SI125 Standard Cylinder SI125X700H 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 SAI125X700H, 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 → SAI125X700H
- 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 SI125X700H
The AirTAC SI125X700H is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 700 mm stroke. Delivering 6136 N push force at 0.5 MPa, it features a G1/2 port, M27x2 rod thread, and a high-temperature Viton H seal rated for 0 to 150 C. As this SKU lacks the -S magnet option, it cannot accept a magnetic sensor.
AirTAC replaced the SI line with the SAI family. The SAI125X700H is the direct successor, retaining the exact ISO 15552 mounting interface, bore, stroke, and porting. The upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure.
Airtac SI125 Standard Cylinder SI125X700H Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X700H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X700H |
| 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 SAI125X700H 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 SAI125X700H 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 SI125X700H
| 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 SI125X700H Is Used
High-Temperature Press Ejection
Handles 6136 N push force to eject parts from hot molds, leveraging the Viton H seal to withstand 0 to 150 C ambient heat without degrading.
Heavy Pallet Transfer
Uses the 700 mm stroke to push heavy pallets between parallel lines, requiring external guide rails to prevent rod bending over the long extension.
Industrial Press Downstroke
Provides up to 11045 N push at 0.9 MPa for pressing assemblies, needing a pilot-operated check valve since the cushion only decelerates and cannot hold the load.
Replacing the Airtac SI125 Standard Cylinder SI125X700H with the SAI125X700H
To replace the SI125X700H, order the SAI125X700H. Confirm the ISO 15552 mounting fixture, the G1/2 port thread, and the Viton H high-temperature seal requirement. Because this is a non-magnetized SKU, it cannot support legacy CS1-B/DS1-B sensors; if position detection is needed, select an SAI variant with the -S magnet. Operating speed is 30-500 mm/s. For sizing alternatives, the neighboring 100 mm bore yields 3927 N push at 0.5 MPa, while the 160 mm bore provides 10053 N. Note that a plain cylinder drifts on air loss; the air cushion only decelerates near stroke end. For load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant. Finally, at 700 mm stroke, prevent rod bending by guiding the load externally to minimize side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X700H
- ✓ 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 SI125X700H FAQ
Yes, the SI125X700H is discontinued. The direct replacement is the SAI125X700H. It shares the identical ISO 15552 mounting interface, 125 mm bore, 700 mm stroke, force, and G1/2 port, fitting directly into existing fixtures.
The bore is 125 mm with a G1/2 port. Force output is 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 SAI125X700H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X700H replacement — usually within 7-8 hours.