This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX600S, 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 SI125AX600S
The AirTAC SI125 Standard Cylinder SI125AX600S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 600mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX600S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke600 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX600S
- 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 SI125AX600S
The AirTAC SI125AX600S is a discontinued double-acting ISO 15552 profile cylinder featuring a 125mm bore, 600mm stroke, and a SUS420J2 stainless steel piston rod. It delivers 6136N push force at 0.5MPa via a G1/2 port. The direct replacement is the SAI125AX600S, matching the interface, force, and stroke.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Note the 600mm travel requires external guides to prevent rod bending, and the magnet works with CS1-B/DS1-B switches.
Airtac SI125 Standard Cylinder SI125AX600S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX600S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX600S |
| Bore size | Ø125 mm |
| Stroke | 600 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 SAI125AX600S 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 SAI125AX600S 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 SI125AX600S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×600 | 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 SI125AX600S Is Used
Heavy Press Forming
Provides the 6136N push force at 0.5MPa needed for stamping and forming dense materials, with the 600mm travel accommodating large die heights.
Pallet Dispensing
The 313kg vertical lift capacity makes it suitable for raising and feeding heavy empty pallets into automated packaging lines over a 600mm drop.
Large Fixture Actuation
Ideal for shifting heavy welding or machining fixtures, where the SUS420J2 stainless rod offers corrosion resistance in harsh shop environments.
Replacing the Airtac SI125 Standard Cylinder SI125AX600S with the SAI125AX600S
To replace this SI125AX600S, order the SAI125AX600S and confirm the ISO 15552 mounting interface, G1/2 port, M27x2 thread, and -S magnet. The 600mm stroke demands external guides to prevent rod-bending side loads. If downsizing, a 100mm bore yields 3927N at 0.5MPa; if upsizing, 160mm gives 10053N. For load holding on air loss, the cushion only decelerates; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX600S
- ✓ 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 SI125AX600S FAQ
Yes, the SI125AX600S is discontinued. The direct replacement is the SAI125AX600S. It is dimensionally interchangeable per ISO 15552, keeping the same 125mm bore, 600mm stroke, force, G1/2 port, and mounting.
It uses a G1/2 port. Force ratings are: push 6136N and pull 5734N at 0.5MPa, push 8590N at 0.7MPa, push 11045N at 0.9MPa, and a theoretical max of 1251kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX600S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX600S replacement — usually within 7-8 hours.