This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX30, 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 SI125AX30
The AirTAC SI125 Standard Cylinder SI125AX30 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 30mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX30, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke30 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX30
- 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 SI125AX30
The AirTAC SI125AX30 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 30 mm stroke. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. The direct replacement is the SAI125AX30, matching the bore, stroke, force, port, and ISO 15552 mounting interface exactly. This specific SKU features a SUS420J2 stainless steel piston rod (-A) for corrosion resistance, but because it lacks a magnet (-S), it cannot accept position sensors.
Upgrading to the SAI125AX30 retains all ratings but introduces an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. The SAI family also adds SAIL, SAIF, and BSAI lock variants unavailable in the legacy SI line.
Airtac SI125 Standard Cylinder SI125AX30 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX30 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX30 |
| Bore size | Ø125 mm |
| Stroke | 30 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 SAI125AX30 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 SAI125AX30 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 SI125AX30
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×30 | 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 SI125AX30 Is Used
Heavy Stamp Pressing
Ideal for short-stroke stamping and pressing tasks requiring high force, utilizing the 6136 N push capacity at 0.5 MPa to form metal components securely.
Pallet Stopper Gate
Functions as a robust stopper gate in high-capacity conveyor systems, using its 313 kg vertical lift equivalent to halt heavy palletized goods reliably.
Injection Mold Clamping
Provides rigid, short-throw clamping force for injection molds or heavy fabrication fixtures, benefiting from the corrosion-resistant SUS420J2 rod in humid environments.
Replacing the Airtac SI125 Standard Cylinder SI125AX30 with the SAI125AX30
To replace the SI125AX30, order the SAI125AX30. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), the G1/2 air port, and the M27x2 rod thread. Because this is a no-S SKU, it cannot support magnetic sensing; if you need switches, select an SAI equivalent with a magnet. If you need to upsize or downsize, neighboring bores are 100 mm and 160 mm, delivering 3927 N and 10053 N push force at 0.5 MPa respectively. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so for load holding consider an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX30
- ✓ 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 SI125AX30 FAQ
Yes, the AirTAC SI125AX30 is discontinued. The direct replacement is the SAI125AX30. It is dimensionally interchangeable per ISO 15552, retaining the exact same 125 mm bore, 30 mm stroke, G1/2 port, and mounting accessories.
It features a G1/2 air port. The force ratings are: 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 maximum of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX30
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX30 replacement — usually within 7-8 hours.