This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X200SFTC, 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 SI125X200SFTC
The AirTAC SI125 Standard Cylinder SI125X200SFTC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 200mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X200SFTC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke200 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X200SFTC
- 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 SI125X200SFTC
The AirTAC SI125X200SFTC is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 200 mm stroke. It delivers 6136 N push force at 0.5 MPa. The direct replacement is the SAI125X200SFTC, which matches the original FTC trunnion mount, G1/2 port, and M27x2 rod thread.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds lock variants (SAIL, BSAI) the SI lacked. This -S model supports CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X200SFTC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X200SFTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X200SFTC |
| Bore size | Ø125 mm |
| Stroke | 200 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 SAI125X200SFTC 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 SAI125X200SFTC 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 SI125X200SFTC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×200 | 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 SI125X200SFTC Is Used
Heavy Stamping Press
Drives large heavy-duty stamping actuators where 6136 N at 0.5 MPa is required to form thick metal components.
Automated Assembly Fixture
Clamps large machinery housings using the FTC trunnion mount to absorb offset loads during bolt tightening.
Replacing the Airtac SI125 Standard Cylinder SI125X200SFTC with the SAI125X200SFTC
To replace the SI125X200SFTC, order the SAI125X200SFTC. Verify the ISO 15552 FTC trunnion mounting dimensions, 125 mm bore, 200 mm stroke, G1/2 port, and the -S magnet for CS1-B/DS1-B switches. Sizing both ways: the 125 mm bore yields 6136 N push at 0.5 MPa, while the neighboring 100 mm bore offers 3927 N. For higher demands, the 160 mm bore provides 10053 N. Note that a plain cylinder drifts on air loss as the cushion only decelerates; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. The 30-500 mm/s speed range suits heavy cycles.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X200SFTC
- ✓ 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 SI125X200SFTC FAQ
Yes, the SI125X200SFTC is discontinued. The direct replacement is the SAI125X200SFTC. It features the same ISO 15552 mounting interface, 125 mm bore, 200 mm stroke, G1/2 port, and FTC trunnion mount, fitting existing fixtures perfectly.
The G1/2 port bore delivers 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N at 0.9 MPa, and a 1251 kgf max at 1.0 MPa. It operates at 30-500 mm/s with a 40 mm cushion.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X200SFTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X200SFTC replacement — usually within 7-8 hours.