This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX280, 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 SI125AX280
The AirTAC SI125 Standard Cylinder SI125AX280 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 280mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX280, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke280 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX280
- 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 SI125AX280
The AirTAC SI125AX280 is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 280mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125AX280, matching the interface, bore, stroke, force, and mounting.
This SKU features a SUS420J2 stainless steel rod but lacks a magnet, so it cannot take a sensor. The SAI upgrade uses two Y-shaped piston seals for low start-up pressure.
Airtac SI125 Standard Cylinder SI125AX280 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX280 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX280 |
| Bore size | Ø125 mm |
| Stroke | 280 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 SAI125AX280 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 SAI125AX280 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 SI125AX280
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×280 | 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 SI125AX280 Is Used
Heavy Pressing
Applies 8590 N at 0.7 MPa for seating large bearings and heavy stamping assemblies.
Clamp Station
Secures heavy fabrication frames during welding, utilizing the M27x2 rod thread.
Replacing the Airtac SI125 Standard Cylinder SI125AX280 with the SAI125AX280
To replace the SI125AX280, order the SAI125AX280. Confirm the ISO 15552 mounting interface, 280mm stroke, G1/2 port, and accessories. Neighbouring bores: 100mm gives 3927 N [email protected]; 160mm gives 10053 N. For load holding, note a plain cylinder drifts on air loss—the cushion only decelerates. Use an external rod lock or SAIL/BSAI variant. At 280mm stroke, guide rods prevent side-load bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX280
- ✓ 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 SI125AX280 FAQ
Yes, the SI125AX280 is discontinued. The direct replacement is the SAI125AX280, a true ISO 15552 profile cylinder matching the 125mm bore, 280mm stroke, force, G1/2 port, and mounting fixtures.
It has a G1/2 port. Force ratings are: 6136 N push / 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. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX280
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX280 replacement — usually within 7-8 hours.