This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X150SN, 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 SI125X150SN
The AirTAC SI125 Standard Cylinder SI125X150SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 150mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X150SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke150 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X150SN
- 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 SI125X150SN
The AirTAC SI125X150SN is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 150 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X150SN, matching the bore, stroke, force, port, and ISO 15552 mounting interface for seamless fixture integration.
The SAI upgrade features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -N denotes NBR seals (-20 to +70 C), with Viton H available for high heat. The -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X150SN Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X150SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X150SN |
| Bore size | Ø125 mm |
| Stroke | 150 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 SAI125X150SN 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 SAI125X150SN 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 SI125X150SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×150 | 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 SI125X150SN Is Used
Heavy Press Clamping
Secures large metal castings during machining operations, utilizing the 6136 N push force to hold components rigidly against the cutting tool.
Pallet Lift Stations
Drives robust lifting arms in automated storage systems, moving loaded pallets safely within the calculated 313 kg vertical lift margin.
Injection Mold Ejection
Ejects dense plastic or aluminum molded parts from heavy industrial presses, relying on the 40 mm adjustable air cushions to decelerate the 32 mm rod.
Replacing the Airtac SI125 Standard Cylinder SI125X150SN with the SAI125X150SN
To replace the SI125X150SN, order the SAI125X150SN, confirming the ISO 15552 mounting interface, 150 mm stroke, G1/2 port, and -S magnet for current AirTAC switches. If downsizing, a 100 mm bore yields 3927 N at 0.5 MPa; if upsizing, a 160 mm bore provides 10053 N. For load holding, note that a plain cylinder drifts on air loss—the cushion only decelerates. Use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. The SAIF valve variant is unavailable for 125 mm bores.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X150SN
- ✓ 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 SI125X150SN FAQ
Yes, the SI125X150SN is discontinued. The direct replacement is the SAI125X150SN. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 125 mm bore, 150 mm stroke, output force, and G1/2 port.
This double-acting cylinder features a G1/2 port and a 32 mm rod. It delivers 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X150SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X150SN replacement — usually within 7-8 hours.