This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X300CA, 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 SI125X300CA
The AirTAC SI125 Standard Cylinder SI125X300CA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 300mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X300CA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke300 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X300CA
- 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 SI125X300CA
The AirTAC SI125X300CA is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 300 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port and CA clevis mount. AirTAC replaced this legacy unit with the SAI125X300CA, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note this specific SKU lacks a magnet, so it cannot accept CS1-B or DS1-B sensors. The SAI family also introduces SAIL and BSAI lock variants absent in the original SI line.
Airtac SI125 Standard Cylinder SI125X300CA Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X300CA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X300CA |
| Bore size | Ø125 mm |
| Stroke | 300 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 SAI125X300CA 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 SAI125X300CA 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 SI125X300CA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×300 | 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 SI125X300CA Is Used
Heavy Stamping Press
Drives large platens and tooling in automated metal forming lines where the 6136 N push force at 0.5 MPa easily overcomes high die resistance.
Large Clamp Fixture
Secures heavy cast or machined components during secondary machining operations using the CA clevis mount for pivoting clamping leverage.
Replacing the Airtac SI125 Standard Cylinder SI125X300CA with the SAI125X300CA
To replace the SI125X300CA, order the SAI125X300CA. Confirm the ISO 15552 CA clevis mounting interface, 125 mm bore, 300 mm stroke, and G1/2 port (available in PT, G, or NPT threads). Because this SKU has no -S magnet, it cannot support position sensing; if switches are needed, specify a magnet on the SAI order. For sizing, the 125 mm bore yields 6136 N push at 0.5 MPa; dropping to an 80 mm bore reduces push to 2513 N, while increasing to 160 mm provides 10053 N. A plain cylinder does not hold load without live air—the cushion only decelerates—so use an external rod lock or pilot check valve for holding, or specify an SAIL or BSAI lock variant. Finally, at 300 mm stroke, use external guides to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X300CA
- ✓ 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 SI125X300CA FAQ
Yes, the SI125X300CA is discontinued. The direct replacement is the AirTAC SAI125X300CA. It shares the identical ISO 15552 mounting interface, 125 mm bore, 300 mm stroke, force, G1/2 port, and CA clevis, fitting directly into existing fixtures.
This double-acting cylinder uses a G1/2 air port. It generates 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
Request a Quote for the SAI125X300CA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X300CA replacement — usually within 7-8 hours.