This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X267, 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 SI125X267
The AirTAC SI125 Standard Cylinder SI125X267 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 267mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X267, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke267 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X267
- 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 SI125X267
The AirTAC SI125X267 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 267 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X267, retaining the same interface, force, and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. Note this non-magnet SKU cannot take a sensor; Viton H seals allow 0-150 C operation.
Airtac SI125 Standard Cylinder SI125X267 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X267 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X267 |
| Bore size | Ø125 mm |
| Stroke | 267 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 SAI125X267 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 SAI125X267 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 SI125X267
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×267 | 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 SI125X267 Is Used
Heavy Stamping Press
Drives large heavy-duty stamping dies requiring 6136 N push force at 0.5 MPa with robust 32 mm rod stability.
Automated Welding Clamp
Holds large structural frames in welding cells, needing external pilot check valves to prevent drift on air loss.
Replacing the Airtac SI125 Standard Cylinder SI125X267 with the SAI125X267
To replace the SI125X267, order the SAI125X267, confirming the ISO 15552 mounting interface, 125 mm bore, 267 mm stroke, G1/2 port, and M27x2 rod thread. Because this SKU lacks the -S magnet, it cannot accept CS1-B/DS1-B sensors. If sizing up or down, neighboring bores offer 8590 N at 0.7 MPa (100 mm) or 11045 N at 0.9 MPa (125 mm). For loads needing 313 kg vertical lift, guide rods prevent side-load damage. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X267
- ✓ 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 SI125X267 FAQ
Yes, the SI125X267 is discontinued. The direct replacement is the SAI125X267. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 267 mm stroke, G1/2 port, and mounting accessories.
The G1/2 port bore delivers 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N at 0.9 MPa, and a 1251 kgf max at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X267
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X267 replacement — usually within 7-8 hours.