This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X410, 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 SI125X410
The AirTAC SI125 Standard Cylinder SI125X410 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 410mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X410, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke410 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X410
- 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 SI125X410
The AirTAC SI125X410 is a discontinued double-acting ISO 15552 profile cylinder delivering 6136 N push force at 0.5 MPa. AirTAC replaced it with the SAI125X410, a direct upgrade retaining the exact 125 mm bore, 410 mm stroke, G1/2 port, and ISO 15552 mounting interface.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note this non-magnet SKU cannot accept a sensor.
Airtac SI125 Standard Cylinder SI125X410 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X410 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X410 |
| Bore size | Ø125 mm |
| Stroke | 410 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 SAI125X410 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 SAI125X410 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 SI125X410
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×410 | 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 SI125X410 Is Used
Heavy Stamping Press
Drives large heavy-duty stamping actuators where the 6136 N push force at 0.5 MPa easily overcomes die resistance.
Pallet Transfer Unit
Pushes loaded pallets along conveyors, utilizing the 410 mm stroke to index heavy goods smoothly between stations.
Industrial Clamp Fixture
Secures large fabricated components during machining, providing rigid holding via the 32 mm piston rod.
Replacing the Airtac SI125 Standard Cylinder SI125X410 with the SAI125X410
To replace the SI125X410, order the SAI125X410. Verify your ISO 15552 mounting interface (LB, FA, CA, TC, etc.), bore, 410 mm stroke, and G1/2 port. This non-magnet version cannot hold a position switch; if sensing is needed, select an SAI125X410S. Sizing both ways: the 125 mm bore yields 6136 N push at 0.5 MPa, while the neighboring 100 mm bore yields 3927 N. Because 410 mm is a long stroke, use external guides to prevent rod bending and side-load damage. A plain cylinder drifts on air loss; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X410
- ✓ 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 SI125X410 FAQ
Yes, the SI125X410 is discontinued. The direct replacement is the SAI125X410. It shares the identical ISO 15552 mounting interface, 125 mm bore, 410 mm stroke, output force, and G1/2 port, fitting existing fixtures perfectly.
The G1/2 port feeds a 125 mm bore yielding 6136 N push and 5734 N pull at 0.5 MPa. At 0.7 MPa push is 8590 N, and 11045 N at 0.9 MPa. The theoretical max is 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X410
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X410 replacement — usually within 7-8 hours.