This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X200FB, 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 SI125X200FB
The AirTAC SI125 Standard Cylinder SI125X200FB 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 SAI125X200FB, 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 → SAI125X200FB
- 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 SI125X200FB
The AirTAC SI125X200FB is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 200 mm stroke. Built with an extruded aluminum barrel, it delivers 6136 N push force at 0.5 MPa via a G1/2 port. As this legacy unit is end-of-life, AirTAC specifies the SAI125X200FB as the direct replacement, retaining the same interface, force, and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this specific SKU lacks a magnet (-S), so it cannot accept CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X200FB Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X200FB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X200FB |
| 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 SAI125X200FB 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 SAI125X200FB 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 SI125X200FB
| 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 SI125X200FB Is Used
Heavy Press Stands
Drives 6136 N at 0.5 MPa for forming and stamping tasks in heavy fabrication cells.
Bulk Material Diverters
Actuates large guide rails on high-throughput packaging lines using the FB flange mount.
Replacing the Airtac SI125 Standard Cylinder SI125X200FB with the SAI125X200FB
To replace the SI125X200FB, order the SAI125X200FB. It drops into existing fixtures via the ISO 15552 mounting interface, matching the 125 mm bore, 200 mm stroke, M27x2 rod thread, and FB flange. Porting remains G1/2. Because this non-magnet SKU cannot host position sensors, order an -S variant if CS1-B/DS1-B switches are needed. Sizing both ways: a 100 mm bore gives 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. For load holding on air loss, note the cushion only decelerates; add an external rod lock, pilot check valve, or select the SAIL/BSAI lock variants. The 32 mm rod handles the 200 mm stroke safely.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X200FB
- ✓ 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 SI125X200FB FAQ
Yes, the SI125X200FB is discontinued. The direct replacement is the SAI125X200FB. It is dimensionally interchangeable per ISO 15552, keeping the same 125 mm bore, 200 mm stroke, G1/2 port, and FB flange.
The G1/2 port feeds a 32 mm rod. 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; and a theoretical max of 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X200FB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X200FB replacement — usually within 7-8 hours.