This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX220, 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 SI125AX220
The AirTAC SI125 Standard Cylinder SI125AX220 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 SAI125AX220, 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 → SAI125AX220
- 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 SI125AX220
The AirTAC SI125AX220 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 220 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125AX220, retaining the exact ISO 15552 mounting interface, bore, stroke, output force, port size, and M27x2 rod thread for existing fixtures.
This SKU features a SUS420J2 stainless piston rod but lacks a magnet, meaning it cannot accept position sensors. The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure. For load holding, note that the 40 mm cushions only decelerate; use a SAIL or BSAI lock variant to prevent drift.
Airtac SI125 Standard Cylinder SI125AX220 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX220 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX220 |
| 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 SAI125AX220 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 SAI125AX220 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 SI125AX220
| 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 SI125AX220 Is Used
Heavy Stamping Press
Drives large heavy-duty stamping dies requiring high thrust, using the 6136 N push force at 0.5 MPa to form thick steel plates reliably.
Injection Molding Clamp
Secures large mold halves in injection molding setups, utilizing the SUS420J2 stainless rod for corrosion resistance in humid environments.
Replacing the Airtac SI125 Standard Cylinder SI125AX220 with the SAI125AX220
To replace the SI125AX220, order the SAI125AX220. Verify the ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/2 port, and the M27x2 thread. Because this specific SKU lacks the -S magnet, it cannot support legacy CS1-B/DS1-B sensors; order a magnet-equipped SAI if position sensing is needed. Sizing both ways: a 125 mm bore yields 6136 N push at 0.5 MPa, while a 100 mm bore offers 3927 N. At 220 mm stroke, side-load is minimal, but always guide the rod to prevent bending. For drop prevention on air loss, add an external pilot check valve or choose the SAIL/BSAI lock variant, as standard cushions only decelerate.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX220
- ✓ 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 SI125AX220 FAQ
Yes, the AirTAC SI125AX220 is discontinued. The direct replacement is the SAI125AX220. It is dimensionally interchangeable per ISO 15552, keeping the same 125 mm bore, 220 mm stroke, force, 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 max force of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX220
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX220 replacement — usually within 7-8 hours.