This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X200FA, 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 SI125X200FA
The AirTAC Airtac SI125 Standard Cylinder SI125X200FA 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 SAI125X200FA, 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 → SAI125X200FA
- 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 SI125X200FA
The AirTAC SI125X200FA is a discontinued double-acting ISO 15552 profile cylinder with an FA flange mount. Delivering 6136 N push force at 0.5 MPa, it features a 125 mm bore, 200 mm stroke, G1/2 port, and M27x2 rod thread. The direct replacement is the SAI125X200FA, matching the interface, force, and port exactly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this non-magnet SKU cannot hold a load without air and cannot take a sensor.
Airtac SI125 Standard Cylinder SI125X200FA Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X200FA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X200FA |
| 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 SAI125X200FA 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 SAI125X200FA 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 SI125X200FA
| 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 SI125X200FA Is Used
Heavy Stamping Press
Drives large dies and heavy platens in metal forming, utilizing the 6136 N push force to shape thick steel plates reliably.
Pallet Positioning
Shifts loaded pallets or heavy totes along conveyor lines, where the robust 125 mm bore handles substantial lateral inertia.
Large Mold Clamping
Secures oversized injection molds or heavy fixtures using the FA flange mount to withstand high operational vibration.
Replacing the Airtac SI125 Standard Cylinder SI125X200FA with the SAI125X200FA
To replace the SI125X200FA, order the SAI125X200FA. Verify the ISO 15552 FA flange interface, 125 mm bore, 200 mm stroke, G1/2 port, and M27x2 thread. This non-magnet version cannot accept a CS1-B/DS1-B sensor. If sizing up or down, neighboring bores are 100 mm (3927 N push @0.5) and 160 mm (10053 N push @0.5). The 30-500 mm/s speed range suits heavy cycles. Because a plain cylinder drifts on air loss, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for held loads. The SAI family also adds the SAIF self-valve option.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X200FA
- ✓ 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 SI125X200FA FAQ
Yes, the AirTAC SI125X200FA is discontinued. The direct replacement is the SAI125X200FA. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 200 mm stroke, FA flange mount, and G1/2 port.
This double-acting cylinder uses a G1/2 air port. At 0.5 MPa it provides 6136 N push and 5734 pull force. At 0.7 MPa push is 8590 N, and 11045 N at 0.9 MPa. The theoretical maximum force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X200FA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X200FA replacement — usually within 7-8 hours.