This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X350-40, 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 SIJ125X350-40
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X350-40 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 350mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X350-40, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke350 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X350-40
- 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 SIJ125X350-40
The AirTAC SIJ125X350-40 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125mm bore and 350mm maximum stroke. An external stop screw lets you trim the extend stroke by up to 40mm on-site, giving a usable extension range of 310-350mm. The stop sets the end position but is not a load lock; the cylinder drifts on air loss.
The direct replacement is the SAIJ125X350-40, matching the ISO 15552 interface, force, port, and mounting. The SAIJ upgrade uses a two Y-shaped one-way piston seal for low start-up pressure and long life. Because the 350mm stroke invites rod bending, use external guides to manage side loads.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X350-40 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X350-40 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X350-40 |
| Bore size | Ø125 mm |
| Stroke | 350 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 SAIJ125X350-40 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 SAIJ125X350-40 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 SIJ125X350-40
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×350 | 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 SIJ125X350-40 Is Used
Press Fit Tuning
Adjustable end-position allows precise 310-350mm press fits without machining custom spacers for each assembly run.
Variable Length Stops
Trimming the extend stroke by up to 40mm on-site accommodates different package sizes on a single conveyor line.
Pallet Positioning
Field-tuning the extend stop ensures accurate pallet placement without repositioning heavy ISO 15552 mountings.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X350-40 with the SAIJ125X350-40
To replace the discontinued SIJ125X350-40, order the direct replacement SAIJ125X350-40, which preserves the 40mm adjust window, 350mm max stroke, and G1/2 port. Choose the 40mm adjust window if you need on-site tuning of the extend endpoint within 310-350mm. Mounting options include FA, LB, and TC brackets. This SKU has no -S magnet and cannot accept a sensor. For the 350mm stroke, add external guides to prevent rod bending from side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X350-40
- ✓ 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 SIJ125X350-40 FAQ
Yes, the SIJ125X350-40 is discontinued. The direct replacement is the SAIJ125X350-40. It matches the ISO 15552 interface, 125mm bore, 350mm stroke, 40mm adjust window, G1/2 port, and mounting hardware. The SAIJ family also features an upgraded two Y-shaped one-way piston seal for longer life.
The external stop screw window is 40mm, allowing the extend stroke to be shortened on-site from the 350mm maximum down to 310mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X350-40
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X350-40 replacement — usually within 7-8 hours.