This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X225TC, 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 SI125X225TC
The AirTAC SI125 Standard Cylinder SI125X225TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 225mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X225TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke225 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X225TC
- 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 SI125X225TC
The AirTAC SI125X225TC is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 225 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X225TC, which shares identical ISO 15552 mounting-interface dimensions, TC trunnion mount, output force, and stroke.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. For load holding, note that a plain cylinder drifts on air loss—the cushion only decelerates—so use a SAIL lock or external pilot check valve. This non-magnet SKU cannot take a sensor.
Airtac SI125 Standard Cylinder SI125X225TC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X225TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X225TC |
| Bore size | Ø125 mm |
| Stroke | 225 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 SAI125X225TC 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 SAI125X225TC 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 SI125X225TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×225 | 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 SI125X225TC Is Used
Heavy Press Clamping
Generates 6136 N of clamping force at 0.5 MPa to secure heavy metal workpieces during machining or welding operations.
Pallet Positioning
Uses the TC trunnion mount to articulate and index loaded pallets on conveyor lines, absorbing high side loads.
Stamping Ejection
Provides robust push force to eject dense stamped parts from press dies, utilizing the 225 mm stroke for full clearance.
Replacing the Airtac SI125 Standard Cylinder SI125X225TC with the SAI125X225TC
To replace the SI125X225TC, order the SAI125X225TC and confirm the ISO 15552 interface, 125 mm bore, 225 mm stroke, G1/2 port, and TC trunnion mounting. This non-magnet version cannot accept a sensor; if position detection is needed, select an SAI equivalent with the S magnet option for current AirTAC switches. Sizing both ways: the 125 mm bore yields 6136 N push at 0.5 MPa, while the neighboring 100 mm bore offers 3927 N. Because the stroke is 225 mm, ensure adequate guide support to prevent rod-bending side loads. For applications requiring load holding on air loss, upgrade to the SAIL or BSAI lock variant, or use an external rod lock, as the standard cushion only decelerates at end-of-stroke.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X225TC
- ✓ 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 SI125X225TC FAQ
Yes, the SI125X225TC is discontinued. The direct replacement is the AirTAC SAI125X225TC. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 225 mm stroke, G1/2 port, TC mount, and force ratings.
The 125 mm bore provides 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. It operates at 30-500 mm/s, uses a G1/2 port, and accepts pressures up to 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X225TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X225TC replacement — usually within 7-8 hours.