This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X300SCA, 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 SI125X300SCA
The AirTAC SI125 Standard Cylinder SI125X300SCA 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 SAI125X300SCA, 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 → SAI125X300SCA
- 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 SI125X300SCA
The AirTAC SI125X300SCA is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 300 mm stroke, delivering 6136 N push force at 0.5 MPa via a G1/2 port. AirTAC replaced this legacy unit with the SAI125X300SCA. This current-production direct maintains the exact same ISO 15552 mounting interface, CA clevis accessory, and output force, fitting existing fixtures perfectly.
The SAI upgrade features a refined piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces lock variants (SAIL, BSAI) absent in the SI line. Your -S suffix denotes a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X300SCA Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X300SCA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X300SCA |
| 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 SAI125X300SCA 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 SAI125X300SCA 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 SI125X300SCA
| 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 SI125X300SCA Is Used
Heavy Press Clamping
Ideal for applying high 6136 N clamping forces on large metal fabrication or heavy press assemblies using the CA clevis mount.
Pallet Lift Stations
Drives robust vertical lifting of loaded pallets up to 313 kg, utilizing the 300 mm stroke to index goods between conveyor tiers.
Bulk Material Diverting
Actuates heavy-duty diverter arms on aggregate or bulk material conveyors, where the 125 mm bore provides the thrust needed to move dense loads.
Replacing the Airtac SI125 Standard Cylinder SI125X300SCA with the SAI125X300SCA
To replace the SI125X300SCA, order the SAI125X300SCA. Verify your ISO 15552 CA clevis mounting, 125 mm bore, 300 mm stroke, G1/2 port, and the -S magnet for position sensing. If downsizing, a 100 mm bore yields 3927 N push at 0.5 MPa; if upsizing, a 160 mm bore provides 10053 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. Because the 300 mm stroke can induce rod bending under side loads, ensure external guide rails are used. The SAI family also offers the SAIF self-valve variant for bores 32-100.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X300SCA
- ✓ 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 SI125X300SCA FAQ
Yes, the SI125X300SCA is discontinued. The direct replacement is the SAI125X300SCA. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 300 mm stroke, G1/2 port, CA mounting, and force ratings.
The 125 mm bore provides a push force of 6136 N and a pull force of 5734 N at 0.5 MPa. At 0.7 MPa it pushes 8590 N, and 11045 N at 0.9 MPa. The theoretical max force is 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X300SCA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X300SCA replacement — usually within 7-8 hours.