This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX220S, 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 SI125AX220S
The AirTAC SI125 Standard Cylinder SI125AX220S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 220mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX220S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke220 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX220S
- 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 SI125AX220S
The AirTAC SI125AX220S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore, 220 mm stroke, and a SUS420J2 stainless piston rod. Delivering 6136 N push force at 0.5 MPa via a G1/2 port, it is replaced by the SAI125AX220S. This direct upgrade retains the exact ISO 15552 mounting interface, bore, and stroke.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The original -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches.
Airtac SI125 Standard Cylinder SI125AX220S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX220S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX220S |
| Bore size | Ø125 mm |
| Stroke | 220 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 SAI125AX220S 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 SAI125AX220S 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 SI125AX220S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×220 | 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 SI125AX220S Is Used
Heavy Press Clamping
Generates 8590 N of thrust at 0.7 MPa to secure large metal castings or heavy composite molds during machining and pressing operations.
Pallet Diversion
Provides the robust push force needed to redirect fully loaded pallets along high-throughput conveyor lines without stalling.
Replacing the Airtac SI125 Standard Cylinder SI125AX220S with the SAI125AX220S
To replace the SI125AX220S, order the SAI125AX220S to keep the identical ISO 15552 mounting interface, 220 mm stroke, G1/2 port, and M27x2 rod thread. Confirm your mounting accessory (LB, FA, TC, etc.) and the -S magnet requirement. Sizing both ways: a 125 mm bore yields 6136 N push at 0.5 MPa, while a neighbouring 100 mm bore offers 3927 N. Because this plain cylinder does not hold load on air loss—the cushion only decelerates—use the SAIL or BSAI lock variants, or an external pilot check valve for suspended loads. At 220 mm stroke, rod bending stress is low, but always guide the load to prevent side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX220S
- ✓ 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 SI125AX220S FAQ
Yes, the SI125AX220S is discontinued. The direct replacement is the SAI125AX220S. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 220 mm stroke, G1/2 port, and mounting interface.
This double-acting cylinder uses a G1/2 air port. It delivers 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 maximum of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX220S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX220S replacement — usually within 7-8 hours.