This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X700S, 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 SI125X700S
The AirTAC SI125 Standard Cylinder SI125X700S 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 SAI125X700S, 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 → SAI125X700S
- 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 SI125X700S
The AirTAC SI125X700S 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 through a G1/2 port, it is directly replaced by the SAI125X700S. This direct upgrade matches the original ISO 15552 mounting interface, bore, stroke, and output force exactly.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces SAIL and BSAI lock variants absent in the legacy line, and the -S magnet on this unit supports CS1-B/DS1-B switches.
Airtac SI125 Standard Cylinder SI125X700S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X700S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X700S |
| 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 SAI125X700S 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 SAI125X700S 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 SI125X700S
| 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 SI125X700S Is Used
Heavy Material Lifts
Raises heavy platforms or lifting gates up to 700 mm, utilizing the 6136 N push force to move substantial loads vertically in industrial facilities.
Large Press Ejection
Ejects finished parts from large stamping presses, where the 125 mm bore provides the necessary power and the 700 mm stroke reaches deep into the machine bed.
Replacing the Airtac SI125 Standard Cylinder SI125X700S with the SAI125X700S
To replace the SI125X700S, order the SAI125X700S, confirming the ISO 15552 mounting interface, 125 mm bore, 700 mm stroke, G1/2 port, and the -S magnet for current AirTAC switches. If sizing alternatives, the neighboring 100 mm bore yields 3927 N push at 0.5 MPa, while the 160 mm bore provides 10053 N. Remember that a standard cylinder does not hold load without live air; the cushions only decelerate. For load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants. Because the 700 mm stroke exceeds 300 mm, use external guides to prevent rod bending and side-load damage. Rod material options include carbon steel, SUS420J2, and SUS304.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X700S
- ✓ 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 SI125X700S FAQ
Yes, the SI125X700S is discontinued. The direct replacement is the SAI125X700S. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 700 mm stroke, G1/2 port, and mounting interface, so it fits existing fixtures perfectly.
The 125 mm bore features a G1/2 air port and provides 6136 N push and 5734 N pull at 0.5 MPa. At 0.7 MPa it pushes 8590 N, and at 0.9 MPa it pushes 11045 N. The theoretical maximum force is 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X700S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X700S replacement — usually within 7-8 hours.