This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X350-75, 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 SIJ125X350-75
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X350-75 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 SAIJ125X350-75, 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 → SAIJ125X350-75
- 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 SIJ125X350-75
The AirTAC SIJ125X350-75 is a double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 350 mm nominal stroke. An external stop screw lets you trim the extend stroke by up to 75 mm on-site, yielding a usable 275-350 mm window. Note this SIJ series is discontinued; the direct replacement is the SAIJ125X350-75, retaining the same interface, force, and adjustability.
The SAIJ successor introduces an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life. The stop screw strictly sets the end position; it is not a load lock. Without live air the piston drifts, so use an external rod lock or check valve for held loads.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X350-75 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X350-75 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X350-75 |
| 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 SAIJ125X350-75 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 SAIJ125X350-75 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 SIJ125X350-75
| 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 SIJ125X350-75 Is Used
Press Fit Tuning
Allows operators to dial in the exact 275-350 mm extend position for pressing bearings without machining custom spacers.
Variable Length Diverter
Adjusts the extend stop on-site to deflect varying package sizes on a heavy-duty sorting line.
Pallet Positioning Stop
Sets a precise physical end-stop for pallets, with the 75 mm window accommodating different pallet heights.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X350-75 with the SAIJ125X350-75
To replace the discontinued SIJ125X350-75, order the direct replacement SAIJ125X350-75, which preserves the 350 mm stroke, 75 mm adjust window, and G1/2 port. Choose the 75 mm adjust window if you need significant on-site extend trimming; the nominal 350 mm remains the maximum. Mounting options include Basic, FA, LB, and TC using the ISO 15552 interface. This SKU lacks the -S magnet, so it cannot accept a magnetic switch. Because the 350 mm stroke exceeds 300 mm, ensure external guides to prevent rod bending and manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X350-75
- ✓ 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 SIJ125X350-75 FAQ
Yes, the SIJ125X350-75 is discontinued. The direct replacement is the SAIJ125X350-75, which matches the 125 mm bore, 350 mm stroke, 75 mm adjust window, G1/2 port, and ISO 15552 mounting interface.
The external stop screw offers a 75 mm adjust window, meaning the usable extend stroke is 275-350 mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X350-75
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X350-75 replacement — usually within 7-8 hours.