This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X1085, 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 SI125X1085
The AirTAC SI125 Standard Cylinder SI125X1085 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 1085mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X1085, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke1085 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X1085
- 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 SI125X1085
The AirTAC SI125X1085 is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 1085mm stroke, delivering 6136N push force at 0.5MPa via a G1/2 port. AirTAC replaced it with the SAI125X1085, a direct sharing the same interface, force, and mounting fixtures.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. This SKU lacks a magnet, so it cannot accept CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X1085 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X1085 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X1085 |
| Bore size | Ø125 mm |
| Stroke | 1085 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 SAI125X1085 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 SAI125X1085 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 SI125X1085
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×1085 | 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 SI125X1085 Is Used
Heavy Stamp Press Feed
Drives robust 313kg vertical lifts in stamping lines, utilizing the full 6136N thrust at 0.5MPa for heavy-gauge metal feeding.
Pallet Transfer Unit
Moves loaded pallets along an 1085mm cycle, relying on the 125mm bore's 5734N pull force to reposition heavy warehouse inventory.
Large Mold Handling
Actuates heavy industrial molds over long distances, requiring external guide rails to manage side-load on the extended 1085mm rod.
Replacing the Airtac SI125 Standard Cylinder SI125X1085 with the SAI125X1085
To replace the SI125X1085, order the SAI125X1085 and confirm the ISO 15552 interface, 125mm bore, 1085mm stroke, G1/2 port (PT/G/NPT), and mounting accessory. Because this SKU has no -S magnet, it cannot take a sensor. For sizing, the neighbouring 100mm bore yields 3927N push at 0.5MPa, while the 160mm bore yields 10053N. At 1085mm stroke, add external guides to prevent rod bending and side-load wear. The air cushion only decelerates; for load holding on air loss, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X1085
- ✓ 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 SI125X1085 FAQ
Yes, the SI125X1085 is discontinued. The direct replacement is the SAI125X1085. It shares the same ISO 15552 mounting interface, 125mm bore, 1085mm stroke, force, and G1/2 port, fitting existing fixtures perfectly.
The G1/2 port bore delivers 6136N push and 5734N pull at 0.5MPa, 8590N push at 0.7MPa, 11045N at 0.9MPa, and a max force of 1251kgf at 1.0MPa. The rod is Ø32mm with an M27x2 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X1085
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X1085 replacement — usually within 7-8 hours.