This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X345, 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 SI125X345
The AirTAC SI125 Standard Cylinder SI125X345 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 345mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X345, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke345 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X345
- 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 SI125X345
The AirTAC SI125X345 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 345 mm stroke. It delivers 6136 N push force at 0.5 MPa using a G1/2 port. AirTAC replaced this legacy unit with the SAI125X345, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI125X345 features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note this specific SKU lacks a magnet, so it cannot accept CS1-B or DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X345 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X345 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X345 |
| Bore size | Ø125 mm |
| Stroke | 345 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 SAI125X345 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 SAI125X345 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 SI125X345
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×345 | 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 SI125X345 Is Used
Heavy Press Operations
Drives substantial clamping force for automotive component pressing, utilizing the 6136 N thrust at 0.5 MPa to seat bearings and heavy assemblies securely.
Pallet Dispensing
Pushes empty or loaded pallets along accumulation lines, where the 345 mm stroke provides the exact reach needed to index materials without collision.
Material Lowering
Lowers heavy fixtures or product stacks with controlled descent, relying on the 40 mm adjustable air cushions to decelerate the load smoothly at stroke end.
Replacing the Airtac SI125 Standard Cylinder SI125X345 with the SAI125X345
To replace the SI125X345, order the SAI125X345 and confirm your ISO 15552 mounting interface, 345 mm stroke, and G1/2 port (PT/G/NPT). The 32 mm piston rod uses an M27x2 thread. Because this SKU has no -S magnet, it cannot support position sensing; if you need switches, select an SAI125X345S. Sizing both ways: a 100 mm bore yields 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. Note that a plain cylinder drifts without live air—the 40 mm cushions only decelerate; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. Finally, at 345 mm stroke, prevent rod bending by guiding the load externally to avoid side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X345
- ✓ 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 SI125X345 FAQ
Yes, the SI125X345 is discontinued. The direct replacement is the AirTAC SAI125X345. It shares the identical ISO 15552 mounting interface, 125 mm bore, 345 mm stroke, output force, and G1/2 port, fitting directly into your existing fixtures.
This 125 mm bore cylinder features a G1/2 port and a 32 mm rod. The force ratings are: 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 maximum of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X345
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X345 replacement — usually within 7-8 hours.