This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X225, 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 SI125X225
The AirTAC SI125 Standard Cylinder SI125X225 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 225mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X225, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke225 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X225
- 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 SI125X225
The AirTAC SI125X225 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 225 mm stroke, delivering 6136 N push force at 0.5 MPa. AirTAC replaced this legacy unit with the SAI125X225, a direct upgrade retaining the exact ISO 15552 mounting interface, G1/2 port, and M27x2 rod thread. The SAI features an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life.
Because this specific SKU lacks the -S magnet suffix, it cannot accept a position sensor and requires a non-magnetic setup. The SAI family also introduces variants the SI lacked, such as the SAIL air-released lock and BSAI clamp-lock for load holding.
Airtac SI125 Standard Cylinder SI125X225 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X225 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X225 |
| Bore size | Ø125 mm |
| Stroke | 225 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 SAI125X225 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 SAI125X225 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 SI125X225
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×225 | 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 SI125X225 Is Used
Heavy Pressing
Drives large stamping and forming presses requiring up to 8590 N of thrust at 0.7 MPa within ISO 15552 fixtures.
Pallet Handling
Indexes heavy loaded pallets along conveyors, utilizing the 32 mm piston rod to maintain structural integrity.
Clamp Actuation
Secures oversized workpieces in machining centers where high pull force and rigid mounting are essential.
Replacing the Airtac SI125 Standard Cylinder SI125X225 with the SAI125X225
To replace the SI125X225, order the SAI125X225 and confirm your ISO 15552 mounting interface, 225 mm stroke, G1/2 port (PT/G/NPT), and M27x2 rod thread. Since this original SKU has no -S magnet, it cannot support legacy CS1-B/DS1-B sensors; if you require position feedback, select an SAI125X225S instead. For sizing both ways, a neighbouring 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, so for load holding use the SAIL lock, BSAI clamp-lock, or an external pilot check valve. With a 225 mm stroke, side-load is minimal, but always ensure rigid guidance to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X225
- ✓ 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 SI125X225 FAQ
Yes, the AirTAC SI125X225 is discontinued. The direct replacement is the SAI125X225. It shares the exact ISO 15552 mounting interface, 125 mm bore, 225 mm stroke, output force, and G1/2 port, fitting existing fixtures perfectly.
The 125 mm bore uses a G1/2 port. It generates 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. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X225
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X225 replacement — usually within 7-8 hours.