This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X1150S, 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 SI125X1150S
The AirTAC SI125 Standard Cylinder SI125X1150S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 1150mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X1150S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke1150 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X1150S
- 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 SI125X1150S
The AirTAC SI125X1150S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 1150 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X1150S, matching the exact interface, stroke and force.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. It also adds SAIL and BSAI lock variants absent in the SI line. The -S magnet works with CS1-B/DS1-B switches; current SAI switches apply to the replacement.
Airtac SI125 Standard Cylinder SI125X1150S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X1150S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X1150S |
| Bore size | Ø125 mm |
| Stroke | 1150 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 SAI125X1150S 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 SAI125X1150S 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 SI125X1150S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×1150 | 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 SI125X1150S Is Used
Heavy Press Ejection
Provides the 6136 N push force needed to eject dense stamped parts from heavy press dies, utilizing the full 1150 mm travel to clear the bed.
Pallet Diversion
Actuates large transfer arms to divert heavy pallets between roller conveyors, where the long stroke and high force ensure complete lateral movement.
Replacing the Airtac SI125 Standard Cylinder SI125X1150S with the SAI125X1150S
To replace the SI125X1150S, order the SAI125X1150S. Verify the ISO 15552 mounting interface, 1150 mm stroke, G1/2 port (PT/G/NPT), and mounting accessory. The -S magnet enables CS1-B/DS1-B sensors. For sizing, neighboring bores offer different forces: the 100 mm bore provides 3927 N push at 0.5 MPa, while the 160 mm bore provides 10053 N. A plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Because the 1150 mm stroke is long, use external guides to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X1150S
- ✓ 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 SI125X1150S FAQ
Yes, the SI125X1150S is discontinued. The direct replacement is the SAI125X1150S. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 1150 mm stroke, G1/2 port, and mounting interface.
The G1/2 port feeds a 32 mm rod. 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. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X1150S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X1150S replacement — usually within 7-8 hours.