This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X120TC, 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 SI125X120TC
The AirTAC SI125 Standard Cylinder SI125X120TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 120mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X120TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke120 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X120TC
- 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 SI125X120TC
The AirTAC SI125X120TC is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 120 mm stroke. It delivers 6136 N push and 5734 pull at 0.5 MPa, using a G1/2 port and M27x2 rod thread. The direct replacement is the SAI125X120TC, which shares the same TC trunnion mounting, force class, and dimensions.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this SKU lacks a magnet and cannot take a sensor; legacy CS1-B/DS1-B switches fit the -S versions only.
Airtac SI125 Standard Cylinder SI125X120TC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X120TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X120TC |
| Bore size | Ø125 mm |
| Stroke | 120 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 SAI125X120TC 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 SAI125X120TC 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 SI125X120TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×120 | 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 SI125X120TC Is Used
Heavy Press Clamping
Secures large metal stamping blanks with 6136 N of push force at 0.5 MPa, utilizing the rigid TC trunnion mount to handle heavy off-center loads.
Bulk Material Diversion
Powers heavy-duty diverter gates on aggregate or mining conveyors, relying on the 125 mm bore to overcome high friction and material resistance.
Replacing the Airtac SI125 Standard Cylinder SI125X120TC with the SAI125X120TC
To replace the SI125X120TC, order the SAI125X120TC and verify the ISO 15552 TC trunnion interface, 120 mm stroke, and G1/2 port (PT/G/NPT thread options). Because this non-magnetic SKU cannot accept a sensor, switch to an SAI125X120S if position detection is required. Sizing both ways: the neighboring 100 mm bore yields 3927 N push at 0.5 MPa, while the 160 mm bore yields 10053 N. For load holding, remember a plain cylinder drifts on air loss—the cushion only decelerates. Use an external pilot check valve or the SAIL/BSAI lock variants. The 32 mm rod handles the 120 mm stroke easily, but always guide external loads to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X120TC
- ✓ 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 SI125X120TC FAQ
Yes, the SI125X120TC is discontinued. The direct replacement is the AirTAC SAI125X120TC. It is dimensionally interchangeable per the ISO 15552 mounting interface, matching the exact 125 mm bore, 120 mm stroke, G1/2 port, and TC trunnion mount.
It uses a G1/2 air port. Theoretical forces 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; with a maximum force of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X120TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X120TC replacement — usually within 7-8 hours.