This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X380TC, 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 SI125X380TC
The AirTAC SI125 Standard Cylinder SI125X380TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 380mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X380TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke380 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X380TC
- 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 SI125X380TC
The AirTAC SI125X380TC is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore, 380 mm stroke, and TC trunnion mount. Delivering 6136 N push force at 0.5 MPa, it features a Ø32 mm rod, M27x2 thread, and G1/2 port. AirTAC replaced this legacy unit with the SAI125X380TC, a direct sharing the exact ISO 15552 mounting interface, bore, and stroke.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. This SKU lacks the -S magnet, so it cannot accept CS1-B/DS1-B sensors. The SAI family also adds SAIL lock, BSAI clamp-lock, and SAIF valve variants.
Airtac SI125 Standard Cylinder SI125X380TC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X380TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X380TC |
| Bore size | Ø125 mm |
| Stroke | 380 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 SAI125X380TC 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 SAI125X380TC 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 SI125X380TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×380 | 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 SI125X380TC Is Used
Heavy Stamping Press
Drives large heavy-duty stamping dies requiring 6136 N of push force at 0.5 MPa with robust TC trunnion mounting.
Bulk Material Divert
Actuates a heavy diverter gate on a high-capacity line, relying on the G1/2 port for rapid 30-500 mm/s operation.
Replacing the Airtac SI125 Standard Cylinder SI125X380TC with the SAI125X380TC
To replace the SI125X380TC, order the SAI125X380TC. Confirm the ISO 15552 TC trunnion interface, 125 mm bore, 380 mm stroke, G1/2 port, and M27x2 rod thread. Because this is a no-S SKU, it cannot support magnetic sensing; if position detection is needed, specify an SAI with the -S magnet option. Operating speed is 30-500 mm/s. For sizing, the neighbouring 100 mm bore yields 3927 N push at 0.5 MPa, while the 160 mm bore yields 10053 N. Note that a plain cylinder drifts on air loss; the 40 mm cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI variants. At 380 mm, use external guides to prevent rod bending and side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X380TC
- ✓ 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 SI125X380TC FAQ
Yes, the SI125X380TC is discontinued. The direct replacement is the SAI125X380TC. It shares the identical ISO 15552 TC mounting interface, 125 mm bore, 380 mm stroke, G1/2 port, and force output, fitting existing fixtures perfectly.
It uses a G1/2 air port. The force ratings 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 theoretical max of 1251 kgf at 1.0 MPa. It operates at 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X380TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X380TC replacement — usually within 7-8 hours.