This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X50-40, 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 SIJ125X50-40
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X50-40 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 50mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X50-40, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X50-40
- 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 SIJ125X50-40
The AirTAC SIJ125X50-40 is a double-acting double-rod ISO 15552 adjustable-stroke cylinder, now discontinued and superseded by the direct replacement SAIJ125X50-40. It uses an external stop screw to trim the extend stroke by up to 40 mm on-site, yielding a usable 10-50 mm extend window from the 50 mm nominal maximum. The stop sets end position only; it is not a load lock.
Replacing it with the SAIJ125X50-40 retains the exact ISO 15552 mounting interface, force, and adjust window, while adding an upgraded two Y-shaped one-way piston seal for lower start-up pressure. Note this SKU lacks a -S magnet and cannot take a switch; for load holding on air loss use an external rod lock or SAIL/BSAI variant.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-40 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-40 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X50-40 |
| Bore size | Ø125 mm |
| Stroke | 50 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 SAIJ125X50-40 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 SAIJ125X50-40 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 SIJ125X50-40
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×50 | 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 SIJ125X50-40 Is Used
Press Fit Tuning
Adjusting the extend end position on-site by up to 40 mm allows precise press-fit depth without machining custom spacers.
Variable Length Diverter
Trimming the 50 mm extend stroke accommodates changing package sizes on a diverting gate without swapping cylinders.
Adjustable End Stop
Setting a specific extend window between 10 and 50 mm provides a field-tunable hard stop for pallet positioning.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-40 with the SAIJ125X50-40
To replace the discontinued SIJ125X50-40, order the direct replacement SAIJ125X50-40, matching the 125 mm bore, 50 mm nominal stroke, 40 mm adjust window, and G1/2 port. Select the 40 mm adjust window if you need to fine-tune the extend end position between 10 and 50 mm. Mounting options include FA, LB, and TC brackets. This non-magnetic SKU cannot accept a sensor; for sensing use an SAIJ-S variant with CS1-B/DS1-B switches. Because the nominal stroke is under 300 mm, side-load rod deflection is minimal.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X50-40
- ✓ 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 SIJ125X50-40 FAQ
Yes, the SIJ125X50-40 is discontinued. The direct replacement is the SAIJ125X50-40, which shares the same ISO 15552 interface, 125 mm bore, 50 mm stroke, 40 mm adjust window, and G1/2 port.
The external stop screw allows trimming the extend stroke by up to 40 mm on-site, yielding a 10-50 mm usable window. The stop sets position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X50-40
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X50-40 replacement — usually within 7-8 hours.