This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X1750S, 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 SI125X1750S
The AirTAC SI125 Standard Cylinder SI125X1750S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 1750mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X1750S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke1750 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X1750S
- 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 SI125X1750S
The AirTAC SI125X1750S is a discontinued double-acting ISO 15552 profile cylinder featuring a built-in magnet for position sensing. Delivering 6136 N push force at 0.5 MPa, it is replaced by the SAI125X1750S direct equivalent, retaining the exact 125 mm bore, 1750 mm stroke, G1/2 port, and mounting interface.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL lock, SAIF valve, and BSAI clamp-lock variants the SI lacked.
Airtac SI125 Standard Cylinder SI125X1750S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X1750S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X1750S |
| Bore size | Ø125 mm |
| Stroke | 1750 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 SAI125X1750S 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 SAI125X1750S 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 SI125X1750S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×1750 | 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 SI125X1750S Is Used
Long-Stroke Material Pusher
Drives heavy workpieces across extended 1750 mm conveyor transfers using 6136 N of thrust at 0.5 MPa, requiring external guides to prevent rod bending.
High-Force Divertor Arm
Actuates large sorting flaps or diverting arms in packaging lines where the 313 kg vertical lift capacity and long stroke handle substantial palletized goods.
Heavy-Duty Lift Station
Raises and lowers heavy tooling platforms, relying on the 40 mm adjustable air cushions to decelerate the massive 125 mm bore payload at stroke ends.
Replacing the Airtac SI125 Standard Cylinder SI125X1750S with the SAI125X1750S
To replace the SI125X1750S, order the SAI125X1750S. Confirm the ISO 15552 mounting interface, G1/2 port, M27x2 rod thread, and the -S magnet for legacy CS1-B/DS1-B switches (the SAI uses current AirTAC switches). Because 1750 mm exceeds the 1500 mm max standard stroke, this is a non-standard made-to-order unit. At this length, prevent rod bending by using an external guide to manage side loads. If sizing both ways, neighboring bores offer different force classes; this 125 mm bore yields 6136 N push at 0.5 MPa. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, specify an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X1750S
- ✓ 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 SI125X1750S FAQ
Yes, the AirTAC SI125X1750S is discontinued. The direct replacement is the SAI125X1750S. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 1750 mm stroke, G1/2 port, and mounting fixtures.
The bore is 125 mm with a G1/2 air port. 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 max of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X1750S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X1750S replacement — usually within 7-8 hours.