This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X700FA, 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 SI125X700FA
The AirTAC Airtac SI125 Standard Cylinder SI125X700FA 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 SAI125X700FA, 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 → SAI125X700FA
- 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 SI125X700FA
The AirTAC SI125X700FA is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 700mm stroke. It delivers 6136N push force at 0.5MPa through a G1/2 port. AirTAC replaced this legacy unit with the SAI125X700FA, a direct upgrade retaining the exact FA flange interface, M27x2 rod thread, and 40mm cushions.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also adds SAIL and BSAI lock variants absent in the SI line. Note this no-S SKU lacks a magnet and cannot accept a sensor.
Airtac SI125 Standard Cylinder SI125X700FA Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X700FA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X700FA |
| 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 SAI125X700FA 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 SAI125X700FA 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 SI125X700FA
| 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 SI125X700FA Is Used
Heavy Stamp Press Feed
Drives robust 700mm linear pushes feeding thick sheet metal into large stamping presses, utilizing the 6136N thrust at 0.5MPa.
Pallet Dispenser Actuation
Moves empty pallets in high-throughput logistics lines where the FA flange mount withstands substantial shifting masses over the long 700mm travel.
Large Mold Ejection
Ejects heavy formed components from machinery, relying on the 125mm bore's 11045N capacity at 0.9MPa for reliable high-force extraction.
Replacing the Airtac SI125 Standard Cylinder SI125X700FA with the SAI125X700FA
To replace the SI125X700FA, order the SAI125X700FA. Confirm the ISO 15552 FA flange mounting, 700mm stroke, G1/2 port, and M27x2 thread. Because this SKU lacks an S designation, it has no magnet and cannot support CS1-B/DS1-B switches. Sizing both ways: the 125mm bore yields 6136N push at 0.5MPa, while the neighboring 100mm bore provides 3927N. Operating speed is 30-500mm/s. At 700mm, add external guides to prevent rod bending and side-load wear. For load holding on air loss, note that cushions only decelerate; use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X700FA
- ✓ 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 SI125X700FA FAQ
Yes, the SI125X700FA is discontinued. The direct replacement is the SAI125X700FA. It is dimensionally interchangeable per ISO 15552, matching the 125mm bore, 700mm stroke, G1/2 port, and FA flange mount. You simply order the SAI equivalent.
The 125mm bore uses a G1/2 port. Force output is 6136N push and 5734N pull at 0.5MPa, 8590N push at 0.7MPa, 11045N push at 0.9MPa, and a theoretical max of 1251kgf at 1.0MPa. Speed is 30-500mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X700FA
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