This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X220H, 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 SI125X220H
The AirTAC SI125 Standard Cylinder SI125X220H 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 SAI125X220H, 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 → SAI125X220H
- 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 SI125X220H
The AirTAC SI125X220H is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore, 220mm stroke, G1/2 port, and Viton H high-temperature seals (0 to 150 C). Delivering 6136 N push force at 0.5 MPa, it is replaced by the SAI125X220H. This direct successor matches the exact ISO 15552 mounting interface, bore, stroke, force, and port, fitting existing fixtures perfectly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this SKU lacks the -S magnet, so it cannot take CS1-B/DS1-B sensors. For load holding, the SAIL or BSAI lock variants are needed, as cushions only decelerate.
Airtac SI125 Standard Cylinder SI125X220H Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X220H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X220H |
| 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 SAI125X220H 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 SAI125X220H 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 SI125X220H
| 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 SI125X220H Is Used
Heavy Pressing
Drives 6136 N at 0.5 MPa for seating heavy bearings or forming thick materials in hot environments up to 150 C using Viton H seals.
High-Temp Ejection
Ejects dense cast parts from molding zones, where the 125mm bore and 220mm stroke provide the robust reach and force needed for reliable clearance.
Replacing the Airtac SI125 Standard Cylinder SI125X220H with the SAI125X220H
To replace the SI125X220H, order the SAI125X220H. Confirm the ISO 15552 interface, 125mm bore, 220mm stroke, G1/2 port (PT/G/NPT), and mounting accessory. This non-magnet SKU cannot accept position sensors. Sizing both ways: a 100mm bore yields 3927 N push @0.5 MPa, while a 160mm bore yields 10053 N. For this 220mm stroke, ensure guide alignment to prevent rod bending. The plain cylinder does not hold load without live air; use an external rod lock or pilot check valve, or specify the SAIL/BSAI lock variants. The SAI family also adds SAIF valve variants (bores 32-100).
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X220H
- ✓ 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 SI125X220H FAQ
Yes, the SI125X220H is discontinued. The direct replacement is the SAI125X220H. It is dimensionally interchangeable per ISO 15552, matching the 125mm bore, 220mm stroke, G1/2 port, and mounting interface, so it drops into existing fixtures.
It features a G1/2 port and M27x2 rod thread. Force output is 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 SAI125X220H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X220H replacement — usually within 7-8 hours.