This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X1200, 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 SI125X1200
The AirTAC SI125 Standard Cylinder SI125X1200 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 1200mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X1200, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke1200 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X1200
- 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 SI125X1200
The AirTAC SI125X1200 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 1200 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X1200, matching the exact interface, bore, stroke, force, port and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This SKU lacks a magnet (-S), so it cannot accept CS1-B/DS1-B sensors. For high heat, Viton H seals raise the temperature limit to 150 C.
Airtac SI125 Standard Cylinder SI125X1200 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X1200 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X1200 |
| Bore size | Ø125 mm |
| Stroke | 1200 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 SAI125X1200 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 SAI125X1200 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 SI125X1200
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×1200 | 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 SI125X1200 Is Used
Heavy Material Lifts
Ideal for elevating heavy platiforms or dies over the full 1200 mm travel, utilizing the 6136 N push force at 0.5 MPa with external guidance.
Large Part Diversion
Drives heavy-duty diverter arms on wide packaging lines, where the 125 mm bore provides the necessary thrust to reposition bulk goods reliably.
Pallet Handling
Indexes loaded pallets at transfer stations, taking advantage of the robust 32 mm piston rod and ISO 15552 mounting to handle substantial inertia.
Replacing the Airtac SI125 Standard Cylinder SI125X1200 with the SAI125X1200
To replace the SI125X1200, order the SAI125X1200 keeping the identical ISO 15552 mounting interface, 125 mm bore, 1200 mm stroke, G1/2 port, and M27x2 rod thread. Confirm your mounting accessory (LB, FA, TC, etc.) and note this non-magnet SKU cannot take a sensor. For sizing, the 100 mm bore offers 3927 N push at 0.5 MPa, while the 160 mm bore yields 10053 N. Because this is a 1200 mm long stroke, use external guides to prevent rod bending and side-load damage. A plain cylinder drifts without live air; the 40 mm cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X1200
- ✓ 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 SI125X1200 FAQ
Yes, the SI125X1200 is discontinued. The direct replacement is the AirTAC SAI125X1200. It is dimensionally interchangeable per ISO 15552, offering the same 125 mm bore, 1200 mm stroke, output force, G1/2 port, and mounting interface, so it fits existing fixtures perfectly.
At 0.5 MPa it provides 6136 N push and 5734 N pull. At 0.7 MPa push is 8590 N, and at 0.9 MPa it is 11045 N. The theoretical max force is 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s, and it uses a G1/2 air port.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X1200
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X1200 replacement — usually within 7-8 hours.