This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX1100S, 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 SI125BX1100S
The AirTAC SI125 Standard Cylinder SI125BX1100S 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 SAI125BX1100S, 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 → SAI125BX1100S
- 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 SI125BX1100S
The AirTAC SI125BX1100S is a discontinued double-acting ISO 15552 profile cylinder featuring a 125 mm bore and a 1100 mm stroke. It delivers a thrust of 6136 N at 0.5 MPa, utilizing a G1/2 air port and a SUS304 stainless steel piston rod. AirTAC replaced this legacy unit with the SAI125BX1100S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, and force ratings.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The original SI-S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family introduces SAIL, SAIF, and BSAI lock variants previously unavailable.
Airtac SI125 Standard Cylinder SI125BX1100S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX1100S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX1100S |
| 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 SAI125BX1100S 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 SAI125BX1100S 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 SI125BX1100S
| 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 SI125BX1100S Is Used
Long-Stroke Material Transfer
Drives heavy pallets across wide conveyor gaps using its 1100 mm reach and 313 kg vertical lift capacity.
High-Bay Storage Retrieval
Extracts totes from deep shelving racks where the SUS304 rod resists moisture and corrosion.
Large Assembly Press
Positions heavy automotive subframes with 6136 N thrust, relying on external guides for stability.
Replacing the Airtac SI125 Standard Cylinder SI125BX1100S with the SAI125BX1100S
To replace the SI125BX1100S, order the SAI125BX1100S, confirming the ISO 15552 mounting interface, G1/2 port, and your specific mounting accessory (LB, FA, TC, etc.). The integrated magnet (-S) means you can use legacy CS1-B/DS1-B switches, though the SAI replacement family uses current AirTAC sensors. If sizing down, a 100 mm bore yields 3927 N at 0.5 MPa; if sizing up, a 160 mm bore provides 10053 N. Note that a plain cylinder does not hold load without live air—the cushion only decelerates—so for load holding consider an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. Because the 1100 mm stroke is long, use external guides to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX1100S
- ✓ 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 SI125BX1100S FAQ
Yes, the SI125BX1100S is discontinued. The direct replacement is the SAI125BX1100S, which shares the same ISO 15552 mounting interface, bore, stroke, force, and G1/2 port for a seamless fixture swap.
This 125 mm bore cylinder uses a G1/2 air port. It delivers a push force of 6136 N and pull of 5734 N at 0.5 MPa, 8590 N at 0.7 MPa, 11045 N at 0.9 MPa, and a theoretical max of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX1100S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX1100S replacement — usually within 7-8 hours.