This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X310, 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 SI125X310
The AirTAC SI125 Standard Cylinder SI125X310 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 310mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X310, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke310 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X310
- 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 SI125X310
The AirTAC SI125X310 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 310 mm stroke, delivering 6136 N push force at 0.5 MPa through its G1/2 port. As this legacy series has ended, the direct replacement is the SAI125X310, which maintains the exact same ISO 15552 mounting interface, output force, and port size.
The SAI upgrade introduces a refined piston seal utilizing two Y-shaped one-way elements for lower start-up pressure and extended life. Note that this specific SKU lacks a magnet (-S), meaning it cannot accept CS1-B or DS1-B legacy sensors.
Airtac SI125 Standard Cylinder SI125X310 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X310 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X310 |
| Bore size | Ø125 mm |
| Stroke | 310 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 SAI125X310 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 SAI125X310 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 SI125X310
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×310 | 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 SI125X310 Is Used
Heavy Press Clamping
Secures large metal castings during machining operations, utilizing the 6136 N push force at 0.5 MPa to hold components rigidly against the fixture.
Bulk Material Diversion
Actuates heavy-duty routing gates on high-capacity conveyor lines, relying on the 310 mm stroke to fully clear the product path.
Replacing the Airtac SI125 Standard Cylinder SI125X310 with the SAI125X310
To replace the discontinued SI125X310, order the SAI125X310, confirming the ISO 15552 mounting interface, 125 mm bore, 310 mm stroke, and G1/2 port (available in PT, G, or NPT). Because this SKU has no magnet, it cannot support position sensing; if switches are needed, specify an SAI125X310S. Sizing checks: if downsizing, a 100 mm bore yields 3927 N push at 0.5 MPa, while a 160 mm bore provides 10053 N. Keep in mind a plain cylinder drifts on air loss—the cushion only decelerates near stroke end. For load holding, use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants. Finally, at 310 mm stroke, use external guides to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X310
- ✓ 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 SI125X310 FAQ
Yes, the AirTAC SI125X310 is discontinued. The direct replacement is the SAI125X310. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 310 mm stroke, G1/2 port, and mounting accessories, but features an upgraded two Y-shaped element piston seal for longer life.
The bore is 125 mm with a G1/2 air port. At 0.5 MPa it provides 6136 N push and 5734 pull force. At 0.7 MPa push is 8590 N, and at 0.9 MPa it is 11045 N. The theoretical maximum force is 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X310
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X310 replacement — usually within 7-8 hours.