This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X300-30, 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 SIJ125X300-30
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X300-30 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 300mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X300-30, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke300 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X300-30
- 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 SIJ125X300-30
The AirTAC SIJ125X300-30 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 300 mm nominal stroke. An external stop screw lets you trim the extend stroke by up to 30 mm on-site, yielding a usable 270-300 mm stroke window. The stop screw strictly sets the end position; it is not a load lock.
The direct replacement is the SAIJ125X300-30, preserving the ISO 15552 mounting interface, bore, force, and port. The upgraded SAI family utilizes a two Y-shaped one-way piston seal for low start-up pressure and long life, adding SAIL and BSAI lock variants absent in the legacy SI line.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X300-30 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X300-30 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X300-30 |
| Bore size | Ø125 mm |
| Stroke | 300 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 SAIJ125X300-30 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 SAIJ125X300-30 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 SIJ125X300-30
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×300 | 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 SIJ125X300-30 Is Used
Press Tonnage Calibration
Requires field stroke tuning to set precise 270-300 mm extend endpoints during light-duty press calibration without re-engineering the fixture.
Pallet Stopper Adjustment
Demands on-site stroke trimming to accommodate different pallet heights, using the external stop screw to set the exact end position.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X300-30 with the SAIJ125X300-30
To replace the discontinued SIJ125X300-30, order the direct replacement SAIJ125X300-30, which retains the G1/2 port, 40 mm cushion, and ISO 15552 mounting. Choose the 30 mm adjust window if your extend stroke needs on-site tuning between 270 and 300 mm. Reuse FA, LB, or TC mounts directly. This SKU lacks the -S magnet and cannot take a magnetic switch. Because the 300 mm stroke invites rod bending, use external guides to manage side loads. For load holding on air loss, use an external rod lock or pilot-operated check valve, as the stop screw is not a brake.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X300-30
- ✓ 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 SIJ125X300-30 FAQ
Yes, the SIJ125X300-30 is discontinued. The direct replacement is the SAIJ125X300-30, matching the 125 mm bore, 300 mm stroke, 30 mm adjust window, G1/2 port, and ISO 15552 mounting.
The external stop screw provides a 30 mm adjust window, allowing the extend stroke to be shortened from the 300 mm maximum down to 270 mm on-site.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X300-30
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X300-30 replacement — usually within 7-8 hours.