This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X600, 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 SI125X600
The AirTAC SI125 Standard Cylinder SI125X600 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 SAI125X600, 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 → SAI125X600
- 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 SI125X600
The AirTAC SI125X600 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 600 mm stroke. Delivering 6136 N push force at 0.5 MPa via a G1/2 port, it is replaced by the SAI125X600 direct, which shares the exact ISO 15552 mounting interface, bore, stroke, output force, port and accessories.
This SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this SKU lacks a magnet and cannot take a sensor; legacy -S models used CS1-B/DS1-B switches. Viton H seals raise operating temperature to 150 C.
Airtac SI125 Standard Cylinder SI125X600 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X600 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X600 |
| 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 SAI125X600 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 SAI125X600 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 SI125X600
| 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 SI125X600 Is Used
Heavy Press Actuation
Drives large press fixtures requiring 6136 N push force at 0.5 MPa, utilizing the 600 mm stroke to fully open and close heavy forming dies.
Bulk Material Diversion
Actuates large-scale diverters on heavy-duty conveyors, with the G1/2 port providing the necessary airflow for 30-500 mm/s speeds.
Replacing the Airtac SI125 Standard Cylinder SI125X600 with the SAI125X600
To replace the SI125X600, order the SAI125X600 keeping the identical 125 mm bore, 600 mm stroke, G1/2 port, M27x2 rod thread and ISO 15552 mounting accessory. This SKU has no magnet (-S) and therefore cannot accept a position switch. Sizing both ways: a 100 mm bore yields 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. For load holding on air loss, note the air cushion only decelerates; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. Because the 600 mm stroke exceeds 300 mm, use an external guide to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X600
- ✓ 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 SI125X600 FAQ
Yes, the SI125X600 is discontinued. The direct replacement is the SAI125X600, which shares the same ISO 15552 mounting interface, 125 mm bore, 600 mm stroke, output force, G1/2 port and accessories.
It features a G1/2 air port, M27x2 rod thread, and adjustable 40 mm cushions. Force output is 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, with a theoretical max of 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X600
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X600 replacement — usually within 7-8 hours.