This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX1100S, 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 SI125AX1100S
The AirTAC SI125 Standard Cylinder SI125AX1100S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 1100mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX1100S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke1100 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX1100S
- 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 SI125AX1100S
The AirTAC SI125AX1100S is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 1100mm stroke. It delivers 6136N push force at 0.5MPa via a G1/2 port. The direct replacement is the SAI125AX1100S, matching the interface, stroke, force, and mounting.
This legacy unit features a SUS420J2 stainless rod and a piston magnet for CS1-B/DS1-B sensors. The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure. For load holding, note the cushion only decelerates; use an external rod lock or SAIL variant.
Airtac SI125 Standard Cylinder SI125AX1100S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX1100S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX1100S |
| Bore size | Ø125 mm |
| Stroke | 1100 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 SAI125AX1100S 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 SAI125AX1100S 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 SI125AX1100S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×1100 | 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 SI125AX1100S Is Used
Heavy Stamping Press
Drives large platens and heavy dies where the 6136N push force at 0.5MPa is required for deep drawing or forming operations.
Pallet Diversion
Actuates heavy-duty lane diverters or stops for large pallets, utilizing the 1100mm stroke to clear wide conveyor paths.
Replacing the Airtac SI125 Standard Cylinder SI125AX1100S with the SAI125AX1100S
To replace the SI125AX1100S, order the SAI125AX1100S, confirming the ISO 15552 mounting interface, G1/2 port, M27x2 thread, and the -S magnet for current AirTAC switches. Sizing checks: dropping to a 100mm bore reduces force to 3927N at 0.5MPa, while a 160mm bore yields 10053N. The 1100mm stroke requires external guides to prevent rod bending under side-loads. For load holding on air loss, add a pilot check valve or select the SAIL/BSAI lock variant, as standard cushions only decelerate. The Viton H seal option raises heat resistance to 150C.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX1100S
- ✓ 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 SI125AX1100S FAQ
Yes, the SI125AX1100S is discontinued. The direct replacement is the SAI125AX1100S. It is dimensionally interchangeable per ISO 15552, retaining the same 125mm bore, 1100mm stroke, force, G1/2 port, and mounting fixtures.
The 125mm bore delivers 6136N push and 5734N pull at 0.5MPa, 8590N push at 0.7MPa, 11045N at 0.9MPa, and a theoretical max of 1251kgf at 1.0MPa. Operating speed is 30-500mm/s, with a 40mm adjustable air cushion at both ends.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX1100S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX1100S replacement — usually within 7-8 hours.