This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X100FTC, 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 SI125X100FTC
The AirTAC Airtac SI125 Standard Cylinder SI125X100FTC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 100mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X100FTC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke100 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X100FTC
- 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 SI125X100FTC
The AirTAC SI125X100FTC is a discontinued double-acting ISO 15552 profile cylinder featuring an extruded aluminum barrel and adjustable air cushions. Delivering 6136 N push force at 0.5 MPa through a 125 mm bore, it used the FTC trunnion mount. This legacy unit is replaced by the SAI125X100FTC.
The SAI direct maintains the exact ISO 15552 mounting dimensions, 100 mm stroke, G1/2 port, and M27x2 rod thread. It upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure. Note this SKU lacks a magnet, so it cannot accept CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X100FTC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X100FTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X100FTC |
| Bore size | Ø125 mm |
| Stroke | 100 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 SAI125X100FTC 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 SAI125X100FTC 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 SI125X100FTC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×100 | 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 SI125X100FTC Is Used
Heavy Pressing
Applies the 6136 N push force at 0.5 MPa for seating large components or heavy-duty pressing tasks.
Pallet Diverting
Uses the FTC trunnion mount to handle robust diverting of heavy pallets along high-capacity lines.
Replacing the Airtac SI125 Standard Cylinder SI125X100FTC with the SAI125X100FTC
To replace the SI125X100FTC, order the SAI125X100FTC. Verify your ISO 15552 FTC trunnion interface, 125 mm bore, 100 mm stroke, and G1/2 port. Because this specific SKU has no -S magnet, it cannot support position sensing; if switches are needed, select an SAI125X100S variant. The plain cylinder does not hold load without live air—the cushion only decelerates. For load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variants. Operating speed is 30-500 mm/s. If sizing up or down, neighboring bores (100/160 mm) alter the 0.5 MPa force (3927 N / 10053 N).
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X100FTC
- ✓ 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 SI125X100FTC FAQ
Yes, the SI125X100FTC is discontinued. The direct replacement is the SAI125X100FTC. It is dimensionally interchangeable per ISO 15552, keeping the same FTC mount, 125 mm bore, 100 mm stroke, force, and G1/2 port.
It features a G1/2 air port. At 0.5 MPa it pushes 6136 N and pulls 5734 N. At 0.7 MPa push is 8590 N, and 11045 N at 0.9 MPa. The theoretical max force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X100FTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X100FTC replacement — usually within 7-8 hours.