This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X30, 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 SI125X30
The AirTAC SI125 Standard Cylinder SI125X30 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 30mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X30, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke30 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X30
- 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 SI125X30
The AirTAC SI125X30 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 30 mm stroke, delivering 6136 N push force at 0.5 MPa. AirTAC replaced it with the SAI125X30, a direct upgrade retaining the exact ISO 15552 mounting interface, G1/2 port, and output force. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also adds SAIL, SAIF, and BSAI variants the SI lacked.
This SKU has no magnet (-S) and cannot accept a CS1-B/DS1-B sensor. The SAI family supports Viton H seals for high temp, plus carbon, SUS420J2, or SUS304 rods. Note that a plain cylinder drifts on air loss; use a SAIL lock or external check valve to hold loads.
Airtac SI125 Standard Cylinder SI125X30 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X30 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X30 |
| Bore size | Ø125 mm |
| Stroke | 30 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 SAI125X30 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 SAI125X30 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 SI125X30
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×30 | 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 SI125X30 Is Used
Heavy Press Operations
Drives high-tonnage stamping and forming dies using 6136 N of thrust at 0.5 MPa, ensuring robust actuation in heavy industrial presses.
Pallet Discharge Gates
Short 30 mm stroke provides abrupt, powerful shifts of heavy-loaded pallet flow lanes, reliably clearing goods at packaging junctions.
Injection Mold Clamping
Secures large mold halves with a 125 mm bore, utilizing the 11045 N available at 0.9 MPa for rigid, zero-deflection holding during injection cycles.
Replacing the Airtac SI125 Standard Cylinder SI125X30 with the SAI125X30
To replace the discontinued SI125X30, order the SAI125X30 direct: it matches the ISO 15552 mounting dimensions, 125 mm bore, 30 mm stroke, G1/2 port, and M27x2 rod thread. Because this specific SKU lacks the -S magnet, it cannot support position sensing; if you need switches, select the SAI125X30S and use current AirTAC sensors. If downsizing, a 100 mm bore yields 3927 N push at 0.5 MPa; if upsizing, a 160 mm bore yields 10053 N. For load holding without live air, the cushion only decelerates, so specify the SAIL air-released lock, BSAI clamp-lock, or an external pilot check valve. The 32 mm rod handles high thrust safely.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X30
- ✓ 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 SI125X30 FAQ
Yes, the SI125X30 is discontinued. The direct replacement is the AirTAC SAI125X30. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 30 mm stroke, G1/2 port, and mounting accessories, so it fits existing fixtures perfectly.
The 125 mm bore uses a G1/2 air port. Theoretical forces are: 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 maximum force of 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X30
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X30 replacement — usually within 7-8 hours.