This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX5, 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 SI125AX5
The AirTAC Airtac SI125 Standard Cylinder SI125AX5 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 5mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX5, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke5 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX5
- 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 SI125AX5
The AirTAC SI125AX5 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 5 mm stroke, delivering 6136 N push force at 0.5 MPa. It features a SUS420J2 stainless steel piston rod (the -A option) for corrosion resistance. The direct replacement is the SAI125AX5, retaining the identical G1/2 port, M27x2 thread, and ISO 15552 mounting interface for existing fixtures.
The SAI upgrade introduces a two-piece Y-shaped piston seal for lower start-up pressure and extended life. Note that this specific SKU lacks a magnet and cannot accept position sensors.
Airtac SI125 Standard Cylinder SI125AX5 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX5 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX5 |
| Bore size | Ø125 mm |
| Stroke | 5 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 SAI125AX5 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 SAI125AX5 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 SI125AX5
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×5 | 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 SI125AX5 Is Used
Heavy Stamping
Short-stroke high-force pressing of thick metal plates in automotive tooling, utilizing the 6136 N thrust at 0.5 MPa.
Riveting Station
Applying concentrated 125 mm bore clamping power to fasten heavy steel structural components securely.
Gate Clamping
Securing large industrial molds or safety barriers using the SUS420J2 stainless rod in humid environments.
Replacing the Airtac SI125 Standard Cylinder SI125AX5 with the SAI125AX5
To replace the SI125AX5, order the SAI125AX5. Verify your ISO 15552 mounting hardware (LB, FA, TC, etc.) and the G1/2 air port. Because this unit lacks the -S magnet, it cannot support CS1-B/DS1-B sensors; if position detection is needed, select an SAI125X5S. For sizing, the 125 mm bore yields 6136 N push at 0.5 MPa; if less force is required, a 100 mm bore provides 3927 N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding consider an external pilot check valve or the SAIL/BSAI lock variants. The 5 mm stroke is very short, minimizing rod-bending risks, but ensure rigid guidance for the 313 kg vertical load capacity.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX5
- ✓ 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 SI125AX5 FAQ
Yes, the AirTAC SI125AX5 is discontinued. The direct replacement is the SAI125AX5. It is dimensionally interchangeable per ISO 15552, maintaining the same 125 mm bore, 5 mm stroke, G1/2 port, and mounting interface.
This 125 mm bore cylinder features a G1/2 port. It delivers 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 maximum theoretical force of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX5
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX5 replacement — usually within 7-8 hours.