This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X80TC, 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 SI125X80TC
The AirTAC SI125 Standard Cylinder SI125X80TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 80mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X80TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke80 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X80TC
- 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 SI125X80TC
The AirTAC SI125X80TC is a discontinued double-acting ISO 15552 profile cylinder with an 80 mm stroke and TC trunnion mount. Built for heavy-duty tasks, it delivers 6136 N push and 5734 N pull at 0.5 MPa using a G1/2 port. AirTAC replaced this EOL unit with the SAI125X80TC, a direct sharing the exact same ISO 15552 mounting interface, bore, stroke, force, port and accessories.
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—so consider the SAIL or BSAI lock variants. This no-magnet SKU cannot accept a sensor.
Airtac SI125 Standard Cylinder SI125X80TC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X80TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X80TC |
| Bore size | Ø125 mm |
| Stroke | 80 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 SAI125X80TC 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 SAI125X80TC 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 SI125X80TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×80 | 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 SI125X80TC Is Used
Heavy Stamping Press
Drives large platens and heavy dies, utilizing the 6136 N push force at 0.5 MPa to form thick metal components securely.
Mold Clamping Station
Holds large injection molds in place via the TC trunnion mount, handling high kinetic energy with 40 mm adjustable cushions.
Replacing the Airtac SI125 Standard Cylinder SI125X80TC with the SAI125X80TC
To replace the SI125X80TC, order the SAI125X80TC. It drops directly into existing fixtures via the ISO 15552 TC trunnion interface, matching the 125 mm bore, 80 mm stroke, M27x2 rod thread, and G1/2 port. If sizing both ways, neighboring bores offer different force classes: a 100 mm bore provides 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. Because this SKU lacks the -S magnet, it cannot support legacy CS1-B/DS1-B sensors; order a magnet-equipped SAI if position detection is required. For applications needing load holding on air loss, upgrade to the SAIL or BSAI lock variant, or use an external pilot check valve. The 80 mm stroke keeps side-load risk low, but always guide the rod for off-center loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X80TC
- ✓ 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 SI125X80TC FAQ
Yes, the SI125X80TC is discontinued. The direct replacement is the SAI125X80TC. It shares the identical ISO 15552 TC mounting interface, 125 mm bore, 80 mm stroke, output force, and G1/2 port, fitting existing fixtures perfectly without modifications.
This double-acting cylinder uses a G1/2 port. It generates 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 maximum of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X80TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X80TC replacement — usually within 7-8 hours.