This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X392SN, 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 SI125X392SN
The AirTAC SI125 Standard Cylinder SI125X392SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 392mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X392SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke392 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X392SN
- 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 SI125X392SN
The AirTAC SI125X392SN is a discontinued double-acting ISO 15552 profile cylinder featuring a 125 mm bore and 392 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. AirTAC replaced this legacy unit with the SAI125X392SN, a direct upgrade retaining the exact mounting interface, bore, stroke, and output force.
The SAI replacement features an upgraded piston seal with 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. This -SN variant includes a piston magnet for CS1-B/DS1-B sensors and NBR seals (-20 to +70 C; Viton H raises this to 150 C).
Airtac SI125 Standard Cylinder SI125X392SN Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X392SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X392SN |
| Bore size | Ø125 mm |
| Stroke | 392 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 SAI125X392SN 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 SAI125X392SN 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 SI125X392SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×392 | 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 SI125X392SN Is Used
Heavy Press Forming
Drives large stamping and forming fixtures requiring high thrust, utilizing the 6136 N push force at 0.5 MPa to shape heavy-gauge materials.
Pallet Lift Stations
Actuates robust lifting platforms in packaging lines, where the 313 kg vertical lift capacity handles loaded pallets smoothly over the 392 mm travel.
Bulk Material Diversion
Pushes heavy product flows on high-throughput conveyors, relying on the adjustable 40 mm air cushions to decelerate substantial moving masses safely.
Replacing the Airtac SI125 Standard Cylinder SI125X392SN with the SAI125X392SN
To replace the SI125X392SN, order the SAI125X392SN. Confirm the ISO 15552 mounting interface, 392 mm stroke, G1/2 port, and your specific mounting accessory (LB, FA, TC, etc.). The built-in magnet (-S) works with legacy CS1-B/DS1-B switches, though the SAI family uses current AirTAC sensors. If sizing down, a 100 mm bore offers 3927 N push at 0.5 MPa; sizing up to 160 mm provides 10053 N. Because this is a 392 mm stroke, use external guides to prevent rod bending and side-load wear. A plain cylinder drifts on air loss—the cushion only decelerates—so use the SAIL or BSAI lock variant, an external rod lock, or a pilot check valve for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X392SN
- ✓ 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 SI125X392SN FAQ
Yes, the SI125X392SN is discontinued. The direct replacement is the AirTAC SAI125X392SN. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 392 mm stroke, G1/2 port, and mounting fixtures, but features an upgraded piston seal for longer life.
This double-acting cylinder uses a G1/2 air port. The force output is 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
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