This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X1500S, 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 SI125X1500S
The AirTAC SI125 Standard Cylinder SI125X1500S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 1500mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X1500S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke1500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X1500S
- 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 SI125X1500S
The AirTAC SI125X1500S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 1500 mm stroke. Delivering 6136 N push force at 0.5 MPa, it is replaced by the SAI125X1500S direct. This successor matches the G1/2 port, M27x2 rod thread, and ISO 15552 mounting interface exactly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. It also introduces SAIL and BSAI lock variants absent in the SI line.
Airtac SI125 Standard Cylinder SI125X1500S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X1500S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X1500S |
| Bore size | Ø125 mm |
| Stroke | 1500 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 SAI125X1500S 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 SAI125X1500S 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 SI125X1500S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×1500 | 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 SI125X1500S Is Used
Heavy Material Lifts
Drives large format lifting gates and heavy bulk material hoppers requiring the full 1500 mm travel and 6136 N push force at 0.5 MPa.
Automated Press Stages
Actuates heavy-duty press fixtures and forming beds where the 125 mm bore delivers the necessary 8590 N thrust at 0.7 MPa.
Pallet Handling
Indexes large loaded pallets along extended conveyors, utilizing the 32 mm rod and 40 mm cushions to absorb impact at stroke ends.
Replacing the Airtac SI125 Standard Cylinder SI125X1500S with the SAI125X1500S
To replace the SI125X1500S, order the SAI125X1500S keeping the 125 mm bore, 1500 mm stroke, G1/2 port, and -S magnet for position sensing. The SAI uses current AirTAC switches, whereas the legacy SI used CS1-B/DS1-B sensors. A no-S SKU cannot take a sensor. Sizing both ways: a 100 mm bore offers 3927 N push at 0.5 MPa, while a 160 mm bore provides 10053 N. For load holding on air loss, note that a plain cylinder drifts; the air cushion only decelerates near stroke end. Use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. At 1500 mm, prevent rod bending by using external guides to manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X1500S
- ✓ 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 SI125X1500S FAQ
Yes, the SI125X1500S is discontinued. The direct replacement is the SAI125X1500S. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 1500 mm stroke, G1/2 port, and mounting accessories exactly.
The 125 mm bore features a G1/2 port. It generates 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 max of 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X1500S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X1500S replacement — usually within 7-8 hours.