This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X125TC, 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 SI125X125TC
The AirTAC SI125 Standard Cylinder SI125X125TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 125mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X125TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke125 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X125TC
- 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 SI125X125TC
The AirTAC SI125X125TC is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 125 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X125TC, which preserves the TC trunnion mount, M27x2 rod thread, and output force.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. For load holding, note that a standard cylinder drifts on air loss—the cushion only decelerates. Use the SAIL or BSAI lock variants if needed.
Airtac SI125 Standard Cylinder SI125X125TC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X125TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X125TC |
| Bore size | Ø125 mm |
| Stroke | 125 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 SAI125X125TC 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 SAI125X125TC 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 SI125X125TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×125 | 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 SI125X125TC Is Used
Heavy Stamping Press
Drives large platens and heavy dies where the 6136 N push force at 0.5 MPa is required to form thick metal components securely.
Pallet Dispenser
Indexes empty or loaded pallets along accumulation lines using the robust TC trunnion mount to accommodate slight frame misalignments.
Automated Welding Clamp
Holds heavy structural steel members in place during robotic welding, utilizing the 125 mm bore's high thrust capacity.
Replacing the Airtac SI125 Standard Cylinder SI125X125TC with the SAI125X125TC
To replace the discontinued SI125X125TC, order the SAI125X125TC. It is dimensionally interchangeable per the ISO 15552 mounting interface, matching the 125 mm bore, 125 mm stroke, G1/2 port, and TC trunnion mounting. Because this specific SKU lacks the -S magnet suffix, it cannot accept a position sensor; if sensing is required, select an SAI model with the S option for current AirTAC switches. If sizing down, a 100 mm bore provides 3927 N push at 0.5 MPa; if sizing up, a 160 mm bore yields 10053 N. For any load holding, the standard cylinder relies on live air and will drift—install an external pilot check valve or choose the SAIL/BSAI locking variants. The 32 mm rod and 40 mm cushions handle the 30-500 mm/s speed range effectively.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X125TC
- ✓ 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 SI125X125TC FAQ
Yes, the SI125X125TC is discontinued. The direct replacement is the SAI125X125TC. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 125 mm stroke, G1/2 port, TC trunnion mount, and force output.
This 125 mm bore cylinder uses 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X125TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X125TC replacement — usually within 7-8 hours.