This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X240TC, 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 SI125X240TC
The AirTAC SI125 Standard Cylinder SI125X240TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 240mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X240TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke240 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X240TC
- 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 SI125X240TC
The AirTAC SI125X240TC is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 240 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X240TC, retaining the same TC trunnion mount, M27x2 rod thread, and 40 mm cushions.
This SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this non-magnetic SKU cannot take a sensor; legacy CS1-B/DS1-B switches require an -S model. For high heat, choose the Viton H seal option (0-150 C).
Airtac SI125 Standard Cylinder SI125X240TC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X240TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X240TC |
| Bore size | Ø125 mm |
| Stroke | 240 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 SAI125X240TC 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 SAI125X240TC 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 SI125X240TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×240 | 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 SI125X240TC Is Used
Heavy Stamping Press
Drives large platens in metal forming, using the 6136 N thrust at 0.5 MPa to shape thick steel blanks reliably.
Bulk Material Diversion
Actuates heavy diverter gates on high-capacity lines, benefiting from the 40 mm adjustable cushions to halt the 240 mm stroke smoothly.
Replacing the Airtac SI125 Standard Cylinder SI125X240TC with the SAI125X240TC
To replace the SI125X240TC, order the SAI125X240TC. Verify the ISO 15552 TC trunnion interface, 125 mm bore, 240 mm stroke, G1/2 port, and M27x2 thread. Since this SKU lacks the -S magnet, it cannot accept position sensors; order an SAI125X240S if you need CS1-B/DS1-B switches. If you need to size up or down, adjacent bores are 100 mm and 160 mm. At 0.5 MPa, this 125 mm bore yields 6136 N push and 5734 pull. A plain cylinder drifts on air loss—the cushions only decelerate. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. The SAI family also adds the SAIF self-valve variant, though only for bores 32-100.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X240TC
- ✓ 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 SI125X240TC FAQ
Yes, the SI125X240TC is discontinued. The direct replacement is the SAI125X240TC. It is dimensionally interchangeable per ISO 15552, matching the bore, stroke, force, G1/2 port, and TC trunnion mount.
Operating at 0.15-1.0 MPa, it pushes 6136 N and pulls 5734 N 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. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X240TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X240TC replacement — usually within 7-8 hours.