This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X230SN, 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 SI125X230SN
The AirTAC SI125 Standard Cylinder SI125X230SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 230mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X230SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke230 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X230SN
- 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 SI125X230SN
The AirTAC SI125X230SN is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 230 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. AirTAC replaced this legacy unit with the SAI125X230SN, a direct replacement sharing the exact ISO 15552 mounting interface, M27x2 rod thread, and 40 mm cushions. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -SN configuration denotes a piston magnet for CS1-B/DS1-B sensors and NBR seals (-20 to +70 C; Viton H raises this to 150 C). The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
This profile cylinder operates at 30-500 mm/s. Note that a standard cylinder drifts without live air; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Airtac SI125 Standard Cylinder SI125X230SN Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X230SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X230SN |
| Bore size | Ø125 mm |
| Stroke | 230 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 SAI125X230SN 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 SAI125X230SN 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 SI125X230SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×230 | 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 SI125X230SN Is Used
Heavy Stamping Press
Drives large heavy-duty stamping operations requiring 6136 N of thrust at 0.5 MPa, utilizing the adjustable 40 mm cushions to absorb high kinetic energy at stroke ends.
Automated Clamp Station
Secures large fabricated components during machining, using the G1/2 port for rapid actuation and NBR seals for standard industrial operating temperatures.
Replacing the Airtac SI125 Standard Cylinder SI125X230SN with the SAI125X230SN
To replace the discontinued SI125X230SN, order the SAI125X230SN. It drops directly into existing ISO 15552 fixtures with the same 125 mm bore, 230 mm stroke, 6136 N output, G1/2 port, and mounting accessories. Confirm your port thread (PT, G, or NPT) and mounting style (LB, FA, TC, etc.). The -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches. If you need to size both ways, a 100 mm bore yields 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. For load holding on air loss, a plain cylinder drifts; the cushion only decelerates. Specify an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 230 mm stroke, side-load and rod-bending risks are moderate, so ensure proper guide alignment to prevent premature seal wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X230SN
- ✓ 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 SI125X230SN FAQ
Yes, the AirTAC SI125X230SN is discontinued. The direct replacement is the SAI125X230SN. It shares the exact ISO 15552 mounting interface, 125 mm bore, 230 mm stroke, output force, G1/2 port, and M27x2 rod thread, fitting existing fixtures perfectly.
The 125 mm bore 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 max of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s, with a 40 mm adjustable air cushion at each end.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X230SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X230SN replacement — usually within 7-8 hours.