This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X320-50, 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 SIJ125X320-50
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X320-50 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 320mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X320-50, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke320 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X320-50
- 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 SIJ125X320-50
The AirTAC SIJ125X320-50 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. An external stop screw lets you trim the extend stroke by up to 50 mm on-site, giving a usable 270-320 mm window from the 320 mm nominal maximum. This SKU lacks a magnet (-S) and cannot accept a magnetic switch.
As SIJ is end-of-life, the direct replacement is the SAIJ125X320-50—matching the ISO 15552 mounting interface, bore, force, and adjust window. The SAIJ upgrade uses a two Y-shaped one-way piston seal for low start-up pressure and long life. The stop screw sets end position only; it is not a load lock.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X320-50 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X320-50 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X320-50 |
| Bore size | Ø125 mm |
| Stroke | 320 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 SAIJ125X320-50 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 SAIJ125X320-50 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 SIJ125X320-50
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×320 | 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 SIJ125X320-50 Is Used
Press Fit Tuning
Allows operators to dial in the exact 270-320 mm extend position on-site for pressing bearings without machining custom spacers.
Variable Length Diverter
Adjusts the extend stop to deflect varying package sizes on a conveyor line, providing flexible routing without swapping cylinders.
Pallet Positioning Stop
Fine-tunes the end-stop height for different pallet stacks, ensuring precise alignment before stretch wrapping.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X320-50 with the SAIJ125X320-50
To replace the discontinued SIJ125X320-50, order the direct replacement SAIJ125X320-50. Choose the 50 mm adjust window if your extend stroke needs on-site tuning between 270 and 320 mm. Reuse your existing FA, LB, or TC ISO 15552 mounts. Because this SKU has no -S magnet, it cannot support legacy CS1-B/DS1-B sensors. For the 320 mm stroke, use external guides to prevent rod bending and side-load wear. The stop screw sets end position only; for load holding on air loss, use an external rod lock or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X320-50
- ✓ 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 SIJ125X320-50 FAQ
Yes, the SIJ125X320-50 is discontinued. The direct replacement is the SAIJ125X320-50, which shares the same ISO 15552 interface, 125 mm bore, 320 mm stroke, 50 mm adjust window, G1/2 port, and mounting options. The SAIJ family also features an upgraded two Y-shaped one-way piston seal for longer life.
The external stop screw provides a 50 mm adjust window, allowing you to shorten the extend stroke from the 320 mm maximum down to 270 mm. The stop sets end position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X320-50
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X320-50 replacement — usually within 7-8 hours.