This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X225-20S, 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 SIJ125 Double Rod Adjustable Cylinder SIJ125X225-20S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X225-20S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 225mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X225-20S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke225 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X225-20S
- 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 SIJ125 Double Rod Adjustable Cylinder SIJ125X225-20S
The AirTAC SIJ125X225-20S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and a 225 mm maximum stroke. An external stop screw lets you trim the extend stroke on-site by up to 20 mm, yielding a usable 205-225 mm stroke window. The direct replacement is the SAIJ125X225-20S, matching the interface, force, and mounting.
The stop screw sets the end position but is not a load lock; use an external rod lock for held loads. The SAIJ upgrade introduces an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life, alongside SAIL and BSAI lock variants absent in the SI line.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X225-20S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X225-20S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X225-20S |
| Bore size | Ø125 mm |
| Stroke | 225 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 SAIJ125X225-20S 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 SAIJ125X225-20S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X225-20S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×225 | 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 SIJ125 Double Rod Adjustable Cylinder SIJ125X225-20S Is Used
Press Fit Calibration
Fine-tuning the extend stroke by up to 20 mm on-site to dial in exact press depths for bearing insertion without machining custom spacers.
Divertor Gate Positioning
Adjusting the actuator end-stop to match varying package sizes on a sorting line, ensuring the gate fully clears product flow.
Pallet Stop Alignment
Setting a precise physical stop position for pallets entering a wrapping station, allowing 20 mm of field flexibility for pallet variations.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X225-20S with the SAIJ125X225-20S
To replace the discontinued SIJ125X225-20S, order the direct replacement SAIJ125X225-20S, which retains the 125 mm bore, 225 mm nominal stroke, 20 mm adjust window, G1/2 port, and ISO 15552 mounting interfaces (Basic, FA, LB, TC). The 20 mm adjust window is ideal for fine-tuning the extend end position within the 205-225 mm range. The -S suffix indicates a built-in piston magnet compatible with legacy CS1-B/DS1-B switches (the SAIJ uses current AirTAC switches). For stroke lengths of 300 mm or more, verify side-load limits to prevent excessive guide wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X225-20S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X225-20S FAQ
Yes, the AirTAC SIJ125X225-20S is discontinued. The direct replacement is the SAIJ125X225-20S. It shares the same ISO 15552 interface, 125 mm bore, 225 mm stroke, 20 mm adjust window, G1/2 port, and mounting options, while adding an upgraded piston seal.
The external stop screw allows you to trim the extend stroke by up to 20 mm on-site, creating a 205-225 mm usable stroke window. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X225-20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X225-20S replacement — usually within 7-8 hours.