This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X1600S, 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 SI125X1600S
The AirTAC SI125 Standard Cylinder SI125X1600S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 1600mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X1600S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke1600 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X1600S
- 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 SI125X1600S
The AirTAC SI125X1600S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 1600 mm stroke. Because 1600 mm exceeds the 1500 mm standard maximum for this bore, it is a non-standard, made-to-order length. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. AirTAC replaced the SI family with the SAI series; the direct replacement is the SAI125X1600S, matching the ISO 15552 mounting interface, output force, and accessories.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The original SI line lacked integrated lock options, but the SAI family adds the SAIL air-released lock and BSAI clamp-lock variants. This -S model includes a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X1600S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X1600S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X1600S |
| Bore size | Ø125 mm |
| Stroke | 1600 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 SAI125X1600S 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 SAI125X1600S 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 SI125X1600S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×1600 | 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 SI125X1600S Is Used
Long-Stroke Transfer
Drives large pallets across wide conveyor sections, utilizing the full 1600 mm travel distance for automated material handling.
Large Press Ejection
Ejects finished parts from heavy industrial presses, relying on 6136 N of thrust to clear the tooling area.
Replacing the Airtac SI125 Standard Cylinder SI125X1600S with the SAI125X1600S
To replace the discontinued SI125X1600S, order the SAI125X1600S. Verify your ISO 15552 mounting interface (LB, FA, CA, TC, etc.), the G1/2 air port, and the M27x2 rod thread. Because the 1600 mm stroke exceeds the 1500 mm standard maximum, expect a made-to-order lead time and ensure external guides are used to prevent rod bending over this long distance. If sizing down, the 100 mm bore offers 3927 N push at 0.5 MPa; sizing up to 160 mm provides 10053 N. Note that a plain cylinder drifts without live air—the cushion only decelerates. For load holding, use an external pilot check valve or specify the SAIL or BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X1600S
- ✓ 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 SI125X1600S FAQ
Yes, the SI125X1600S is discontinued. The direct replacement is the SAI125X1600S. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 125 mm bore, 1600 mm stroke, output force, G1/2 port, and mounting accessories.
At 0.5 MPa it provides 6136 N push and 5734 N pull force. 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 pressure is 0.15-1.0 MPa, speed is 30-500 mm/s, and the G1/2 port is fixed by the bore.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X1600S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X1600S replacement — usually within 7-8 hours.