This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X280TC, 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 SI125X280TC
The AirTAC SI125 Standard Cylinder SI125X280TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 280mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X280TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke280 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X280TC
- 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 SI125X280TC
The AirTAC SI125X280TC is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 280 mm stroke. Delivering 6136 N push force at 0.5 MPa, it uses a G1/2 port and TC trunnion mount. The direct replacement is the SAI125X280TC, matching the exact interface, force, and port.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This no-magnet SKU cannot take a sensor; legacy CS1-B/DS1-B switches require the -S version. Viton H seals raise heat to 150 C.
Airtac SI125 Standard Cylinder SI125X280TC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X280TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X280TC |
| Bore size | Ø125 mm |
| Stroke | 280 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 SAI125X280TC 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 SAI125X280TC 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 SI125X280TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×280 | 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 SI125X280TC Is Used
Heavy Press Clamping
Generates 6136 N at 0.5 MPa to secure large steel plates during machining, utilizing the rigid TC trunnion to handle offset loads.
Stamping Ejection
Ejects dense metal stampings from press beds, using the 280 mm stroke to clear the tooling area completely before the next cycle.
Replacing the Airtac SI125 Standard Cylinder SI125X280TC with the SAI125X280TC
To replace the SI125X280TC, order the SAI125X280TC. Verify the ISO 15552 TC trunnion interface, 125 mm bore, 280 mm stroke, G1/2 port (PT/G/NPT), and lack of magnet. Sizing both ways: a 100 mm bore yields 3927 N [email protected], while a 160 mm bore yields 10053 N. At 280 mm stroke, watch for side-load and rod-bending; use a guide to prevent premature wear. A plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. Speed is 30-500 mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X280TC
- ✓ 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 SI125X280TC FAQ
Yes, the SI125X280TC is discontinued. The direct replacement is the SAI125X280TC. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 280 mm stroke, G1/2 port, TC mount, and 6136 N force. You just order the SAI equivalent.
The G1/2 port bore delivers 6136 N push and 5734 N pull at 0.5 MPa. At 0.7 MPa push is 8590 N, and 11045 N at 0.9 MPa. The theoretical max is 1251 kgf at 1.0 MPa. It features a 32 mm rod, M27x2 thread, and 40 mm cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X280TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X280TC replacement — usually within 7-8 hours.