This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X600N, 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 SI125X600N
The AirTAC SI125 Standard Cylinder SI125X600N 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 SAI125X600N, 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 → SAI125X600N
- 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 SI125X600N
The AirTAC SI125X600N is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 600mm stroke. It delivers 6136N push force at 0.5MPa via a G1/2 port. The direct replacement is the SAI125X600N, matching the exact ISO 15552 mounting interface, bore, stroke, force, and accessories.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. For this NBR-sealed SKU, temperature ranges from -20 to +70C (Viton H extends to 150C). With no -S suffix, this cylinder cannot take a magnetic switch.
Airtac SI125 Standard Cylinder SI125X600N Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X600N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X600N |
| 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 SAI125X600N 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 SAI125X600N 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 SI125X600N
| 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 SI125X600N Is Used
Heavy Pressing
Applies 6136N of thrust at 0.5MPa for seating heavy industrial components and actuating large forming presses.
Pallet Diversion
Handles long 600mm strokes to push heavy pallets onto secondary packaging lines with reliable kinetic energy absorption.
Replacing the Airtac SI125 Standard Cylinder SI125X600N with the SAI125X600N
To replace the SI125X600N, order the SAI125X600N. Confirm the ISO 15552 interface, 125mm bore, 600mm stroke, G1/2 port, and mounting accessory. This SKU lacks the -S magnet, so it cannot accept CS1-B/DS1-B sensors; order a magnet-equipped SAI if sensing is needed. At 0.5MPa it yields 6136N push; neighbouring bores are 100mm (3927N) or 160mm (10053N). For load holding on air loss, add an external rod lock or pilot check valve, or use the SAIL/BSAI lock variants. Because the 600mm stroke exceeds 300mm, use external guides to prevent rod-bending side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X600N
- ✓ 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 SI125X600N FAQ
Yes, the SI125X600N is discontinued. The direct replacement is the SAI125X600N. It shares the same ISO 15552 mounting interface, 125mm bore, 600mm stroke, output force, and G1/2 port, fitting existing fixtures perfectly.
It features a G1/2 port and 32mm rod. Forces are 6136N push and 5734N pull at 0.5MPa, 8590N push at 0.7MPa, and a max of 1251kgf at 1.0MPa. Speed is 30-500mm/s. The 40mm adjustable cushions only decelerate; they do not hold loads.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X600N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X600N replacement — usually within 7-8 hours.