This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X1175, 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 SI125X1175
The AirTAC SI125 Standard Cylinder SI125X1175 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 1175mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X1175, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke1175 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X1175
- 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 SI125X1175
The AirTAC SI125X1175 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 1175 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X1175, matching the exact interface, force, and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. Note this SKU lacks a magnet (-S) and cannot take a sensor. For high heat, Viton H seals raise the temperature range to 0-150 C.
Airtac SI125 Standard Cylinder SI125X1175 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X1175 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X1175 |
| Bore size | Ø125 mm |
| Stroke | 1175 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 SAI125X1175 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 SAI125X1175 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 SI125X1175
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×1175 | 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 SI125X1175 Is Used
Long-Stroke Material Transfer
Pushes heavy pallets across wide conveyor gaps using the full 1175 mm travel, relying on the 6136 N thrust at 0.5 MPa to overcome rolling resistance.
High-Bay Extractor Arm
Acts as a deep-reach extraction axis in automated storage systems, requiring external guide rails to support the extended 32 mm rod over 1175 mm.
Large Press Ejection
Ejects formed parts from heavy industrial presses, utilizing the adjustable 40 mm air cushions to decelerate the massive moving load at stroke end.
Replacing the Airtac SI125 Standard Cylinder SI125X1175 with the SAI125X1175
To replace the SI125X1175, order the SAI125X1175. Confirm the ISO 15552 mounting interface (LB, FA, TC, etc.), the G1/2 port, and M27x2 rod thread. Because this SKU lacks the -S magnet, it cannot accept CS1-B/DS1-B sensors. For sizing, a 100 mm bore yields 3927 N at 0.5 MPa, while a 160 mm bore yields 10053 N. The 1175 mm stroke demands external guides to prevent rod bending under side loads. The air cushion only decelerates; it does not hold load. For load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X1175
- ✓ 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 SI125X1175 FAQ
Yes, the SI125X1175 is discontinued. The direct replacement is the SAI125X1175. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 1175 mm stroke, 6136 N force, G1/2 port, and mounting accessories.
It operates at 30-500 mm/s. Forces are: push 6136 N and pull 5734 N at 0.5 MPa, push 8590 N at 0.7 MPa, push 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 SAI125X1175
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X1175 replacement — usually within 7-8 hours.