This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X1100S, 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 SI125X1100S
The AirTAC SI125 Standard Cylinder SI125X1100S 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 SAI125X1100S, 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 → SAI125X1100S
- 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 SI125X1100S
The AirTAC SI125X1100S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 1100 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. AirTAC replaced this legacy unit with the SAI125X1100S, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, force, and port size.
The SAI replacement features an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. It also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line. The -S suffix denotes a piston magnet for CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X1100S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X1100S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X1100S |
| 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 SAI125X1100S 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 SAI125X1100S 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 SI125X1100S
| 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 SI125X1100S Is Used
Heavy Material Lift
Elevates heavy pallets or chassis components, utilizing the 6136 N push force at 0.5 MPa over a 1100 mm travel distance.
Long-Stroke Diversion
Actuates large format diverters or sorting gates on wide conveyor lines requiring an extended 1.1 meter reach.
Replacing the Airtac SI125 Standard Cylinder SI125X1100S with the SAI125X1100S
To replace the SI125X1100S, order the SAI125X1100S. Confirm the ISO 15552 mounting interface, 125 mm bore, 1100 mm stroke, G1/2 port (PT/G/NPT thread options), and mounting accessory. The -S magnet is present for current AirTAC switches. If sizing up or down, neighboring bores are 100 mm (3927 N push @0.5 MPa) and 160 mm (10053 N push). A plain cylinder drifts on air loss; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 1100 mm, prevent rod bending by guiding the load externally to minimize side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X1100S
- ✓ 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 SI125X1100S FAQ
Yes, the SI125X1100S is discontinued. The direct replacement is the SAI125X1100S. It shares the identical ISO 15552 mounting interface, 125 mm bore, 1100 mm stroke, output force, and G1/2 port, fitting existing fixtures perfectly.
The 125 mm bore features a G1/2 port. Force ratings are: 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 maximum of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X1100S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X1100S replacement — usually within 7-8 hours.