This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X1000N, 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 SI125X1000N
The AirTAC SI125 Standard Cylinder SI125X1000N is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 1000mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X1000N, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke1000 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X1000N
- 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 SI125X1000N
The AirTAC SI125X1000N is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 1000 mm stroke. Delivering 6136 N push force at 0.5 MPa via a G1/2 port, it is replaced by the SAI125X1000N. This direct successor shares the exact ISO 15552 mounting interface, bore, and output force, fitting existing fixtures perfectly.
Because this SKU lacks the -S magnet, it cannot accept position sensors. The SAI upgrade features an improved piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The NBR seal supports -20 to +70 C; Viton H extends this to 150 C.
Airtac SI125 Standard Cylinder SI125X1000N Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X1000N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X1000N |
| Bore size | Ø125 mm |
| Stroke | 1000 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 SAI125X1000N 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 SAI125X1000N 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 SI125X1000N
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×1000 | 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 SI125X1000N Is Used
Heavy Material Lifts
Drives 1000 mm vertical strokes for heavy platens, using the 6136 N push force to elevate assemblies along guided rails.
Large Press Actuation
Provides steady clamping force over extended distances in large press fixtures, relying on the 40 mm adjustable air cushions for end-of-stroke deceleration.
Pallet Rejection
Executes long 1-meter sorting strokes to push heavy pallets off high-speed lines, requiring external guides to manage the lengthy rod extension.
Replacing the Airtac SI125 Standard Cylinder SI125X1000N with the SAI125X1000N
To replace the discontinued SI125X1000N, order the SAI125X1000N, confirming the ISO 15552 mounting interface, 1000 mm stroke, G1/2 port, and M27x2 rod thread. Since this is a no-S SKU, it cannot take a magnetic sensor; if sensing is needed, select an SAI with the magnet option and CS1-B/DS1-B equivalent switches. Sizing both ways: this bore yields 6136 N push at 0.5 MPa (1251 kgf max at 1.0 MPa); if lower force is acceptable, an 80 mm bore provides 2513 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants. Finally, at 1000 mm stroke, prevent rod bending by guiding the load externally to avoid side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X1000N
- ✓ 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 SI125X1000N FAQ
Yes, the SI125X1000N is discontinued. The direct replacement is the SAI125X1000N. It shares the same ISO 15552 mounting interface, 125 mm bore, 1000 mm stroke, G1/2 port, and output force, dropping directly into existing machinery.
The bore features a G1/2 air port and an M27x2 rod thread. 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, and a theoretical maximum of 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X1000N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X1000N replacement — usually within 7-8 hours.