This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X300-75, 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 SIJ125X300-75
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X300-75 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 SAIJ125X300-75, 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 → SAIJ125X300-75
- 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 SIJ125X300-75
The AirTAC SIJ125X300-75 is a double-acting, double-rod ISO 15552 adjustable-stroke cylinder. The external stop screw lets you trim the extend stroke by up to 75 mm on-site, giving a usable 225-300 mm end position. This SIJ model is discontinued; the direct replacement is the SAIJ125X300-75, matching the bore, stroke, force, and mounting.
The SAIJ upgrade introduces a two-piece Y-shaped piston seal for lower start-up pressure and longer life. The stop screw sets the end position but is not a load lock; use an external rod lock for held loads.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X300-75 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X300-75 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X300-75 |
| 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 SAIJ125X300-75 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 SAIJ125X300-75 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 SIJ125X300-75
| 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 SIJ125X300-75 Is Used
Press Fit Tuning
Allows operators to dial in the exact 225-300 mm extend position for pressing bearings without swapping physical spacers.
Variable Length Diverter
Adjusts the extend stroke on-site to accommodate different package sizes on a sorting line.
Adjustable Stop Gate
Provides a field-tunable end-stop for pallets, allowing quick changes to the stopping distance based on pallet depth.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X300-75 with the SAIJ125X300-75
To replace the discontinued SIJ125X300-75, order the direct replacement SAIJ125X300-75, keeping the same ISO 15552 mounting interface and G1/2 port. Choose the 75 mm adjust window if your application requires field-tuning the extend stroke between 225 and 300 mm. Reuse FA, LB, or TC mounts. This SKU lacks the -S magnet and cannot take a magnetic switch. For the 300 mm stroke, use external guides to prevent rod bending and manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X300-75
- ✓ 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 SIJ125X300-75 FAQ
Yes, the SIJ125X300-75 is discontinued. The direct replacement is the SAIJ125X300-75, which shares the same ISO 15552 interface, 125 mm bore, 300 mm stroke, 75 mm adjust window, and G1/2 port.
The external stop screw allows trimming the extend stroke by up to 75 mm on-site (usable stroke 225-300 mm). The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X300-75
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X300-75 replacement — usually within 7-8 hours.