This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX165, 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 SI125AX165
The AirTAC SI125 Standard Cylinder SI125AX165 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 165mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX165, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke165 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX165
- 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 SI125AX165
The AirTAC SI125AX165 is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 165mm stroke. Delivering 6136N push force at 0.5MPa via a G1/2 port, it is replaced by the SAI125AX165. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, force and port for seamless fixture integration.
The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This SI125AX165 variant uses a SUS420J2 stainless rod and lacks a magnet, so it cannot accept sensors. The SAI family also adds SAIL, SAIF and BSAI lock variants.
Airtac SI125 Standard Cylinder SI125AX165 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX165 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX165 |
| Bore size | Ø125 mm |
| Stroke | 165 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 SAI125AX165 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 SAI125AX165 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 SI125AX165
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×165 | 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 SI125AX165 Is Used
Heavy Stamping Press
Provides the robust 6136N push force at 0.5MPa required to actuate heavy-duty stamping and forming presses.
Large Clamp Actuation
Drives substantial clamping mechanisms on large fabricated assemblies where a 165mm stroke secures components.
Replacing the Airtac SI125 Standard Cylinder SI125AX165 with the SAI125AX165
To replace the SI125AX165, order the SAI125AX165. Confirm the ISO 15552 mounting interface, 125mm bore, 165mm stroke, G1/2 port, and SUS420J2 stainless rod. Because this SKU lacks a magnet (-S), it cannot accept legacy CS1-B/DS1-B switches. For sizing, neighbouring bores are 100mm (3927N [email protected]) and 160mm (10053N [email protected]). At 0.7MPa this 125mm bore pushes 8590N. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. Stroke is under 300mm, so rod-bending side-load risks are minimal, but always guide the load.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX165
- ✓ 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 SI125AX165 FAQ
Yes, the SI125AX165 is discontinued. The direct replacement is the SAI125AX165. It is dimensionally interchangeable per the ISO 15552 mounting interface, maintaining the same 125mm bore, 165mm stroke, output force, G1/2 port, and mounting accessories.
This 125mm bore cylinder uses a G1/2 air port. It delivers 6136N push and 5734N pull at 0.5MPa, 8590N push at 0.7MPa, 11045N push at 0.9MPa, and a theoretical max of 1251 kgf at 1.0MPa. The rod is 32mm with an M27x2 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX165
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX165 replacement — usually within 7-8 hours.