This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X300-20, 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 SIJ125X300-20
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X300-20 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 SAIJ125X300-20, 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 → SAIJ125X300-20
- 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 SIJ125X300-20
The AirTAC SIJ125X300-20 is a double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 300 mm maximum extend. An external stop screw lets you trim the extend stroke by up to 20 mm on-site, yielding a usable 280-300 mm window. The SIJ family is discontinued; the direct replacement is the SAIJ125X300-20, matching the ISO 15552 interface, force, and mounting.
The SAIJ upgrade incorporates a two Y-shaped one-way piston seal for low start-up pressure and extended life. Note this SKU lacks a -S magnet and cannot take a switch. The stop screw sets end position but is not a load lock; use an external rod lock for held loads.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X300-20 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X300-20 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X300-20 |
| 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 SAIJ125X300-20 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 SAIJ125X300-20 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 SIJ125X300-20
| 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 SIJ125X300-20 Is Used
Press Fit Tuning
Allows precise on-site adjustment of the extend end-position for pressing assemblies, trimming up to 20 mm to accommodate material thickness variations without re-mounting.
Divertor Stroke Setup
Ideal for diverter arms where the exact reach must be dialed in during commissioning, using the stop screw to set the 280-300 mm extend window perfectly.
Pallet Stop Positioning
Provides adjustable mechanical end-stops for pallet handling lines, enabling quick field changes to the extend position when pallet sizes change.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X300-20 with the SAIJ125X300-20
To replace the discontinued SIJ125X300-20, specify SAIJ125X300-20 for an direct match. Choose the 20 mm adjust window if your end-position tuning requires trimming the 300 mm nominal stroke down to 280 mm. Mounting options include FA, LB, and TC brackets. Because this SKU has no -S suffix, it cannot accept a magnetic switch. For the 300 mm stroke, ensure external guides are used to mitigate rod-bending and side-load risks.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X300-20
- ✓ 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 SIJ125X300-20 FAQ
Yes, the SIJ125X300-20 is discontinued. The direct replacement is the SAIJ125X300-20, which shares the same ISO 15552 interface, 125 mm bore, 300 mm stroke, 20 mm adjust window, G1/2 port, and mounting options.
The external stop screw offers a 20 mm adjust window, shortening the 300 mm nominal extend stroke down to 280 mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X300-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X300-20 replacement — usually within 7-8 hours.