This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX65S, 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 SI125AX65S
The AirTAC SI125 Standard Cylinder SI125AX65S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 65mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX65S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke65 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX65S
- 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 SI125AX65S
The AirTAC SI125AX65S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 65 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125AX65S, sharing the same interface, force, and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This -A variant uses a SUS420J2 stainless rod, and the -S magnet works with CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125AX65S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX65S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX65S |
| Bore size | Ø125 mm |
| Stroke | 65 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 SAI125AX65S 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 SAI125AX65S 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 SI125AX65S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×65 | 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 SI125AX65S Is Used
Heavy Pressing
Applies the 6136 N push force at 0.5 MPa for seating heavy bearings or forming robust components in automated machinery.
Pallet Handling
Moves substantial loads over the 65 mm stroke, utilizing the SUS420J2 stainless rod to resist moisture in damp logistics environments.
Clamp Fixtures
Secures large workpieces during machining, relying on the ISO 15552 profile barrel for rigid, stable mounting on the factory floor.
Replacing the Airtac SI125 Standard Cylinder SI125AX65S with the SAI125AX65S
To replace the SI125AX65S, order the SAI125AX65S. Confirm the ISO 15552 mounting interface, 65 mm stroke, G1/2 port, and your specific mounting accessory. The -A denotes a SUS420J2 stainless rod and -S indicates a piston magnet for CS1-B/DS1-B switches. For sizing, this bore yields 6136 N push at 0.5 MPa; if less force is needed, an 80 mm bore gives 2513 N. 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.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX65S
- ✓ 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 SI125AX65S FAQ
Yes, the SI125AX65S is discontinued. The direct replacement is the SAI125AX65S. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 65 mm stroke, G1/2 port, and mounting interface.
The 125 mm bore provides 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. The port is G1/2.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX65S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX65S replacement — usually within 7-8 hours.