This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X220S, 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 SI125X220S
The AirTAC SI125 Standard Cylinder SI125X220S 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 SAI125X220S, 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 → SAI125X220S
- 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 SI125X220S
The AirTAC SI125X220S is a discontinued double-acting ISO 15552 profile cylinder featuring a 125mm bore and 220mm stroke. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. AirTAC replaced this legacy unit with the SAI125X220S, a direct upgrade retaining the exact mounting interface, bore, stroke, force, and port size.
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 SAIL, SAIF, and BSAI lock variants the SI lacked. This SI125X220S includes a magnet for CS1-B/DS1-B sensors, and rod options include SUS420J2 or SUS304.
Airtac SI125 Standard Cylinder SI125X220S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X220S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X220S |
| 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 SAI125X220S 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 SAI125X220S 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 SI125X220S
| 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 SI125X220S Is Used
Heavy Stamping
Drives large presses and stamping fixtures requiring up to 11045 N of thrust at 0.9 MPa for forming thick materials.
Pallet Handling
Indexes heavy loaded pallets along conveyors, utilizing the 313 kg vertical lift capacity to lift and position loads securely.
Clamping Jigs
Provides rigid clamping force on large welding jigs, holding components firmly in place during automated manufacturing processes.
Replacing the Airtac SI125 Standard Cylinder SI125X220S with the SAI125X220S
To replace the SI125X220S, order the SAI125X220S direct, confirming the ISO 15552 interface, 125mm bore, 220mm stroke, G1/2 port, M27x2 thread, and the -S magnet for current AirTAC switches. Sizing both ways: a 100mm bore gives 3927 N push at 0.5 MPa, while a 160mm bore yields 10053 N. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, specify the SAIL or BSAI lock variant, or use an external pilot check valve. At 220mm stroke, rod bending is minimal, but for longer 300mm+ strokes, guide external loads to prevent side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X220S
- ✓ 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 SI125X220S FAQ
Yes, the SI125X220S is discontinued. The direct replacement is the SAI125X220S. It is dimensionally interchangeable per ISO 15552, matching the 125mm bore, 220mm stroke, output force, G1/2 port, and mounting interface.
The G1/2 port bore delivers a push of 6136 N and pull of 5734 N at 0.5 MPa. 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, with speeds of 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X220S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X220S replacement — usually within 7-8 hours.