This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X450-20, 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 SIJ125X450-20
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X450-20 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 450mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X450-20, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke450 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X450-20
- 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 SIJ125X450-20
The AirTAC SIJ125X450-20 is a double-acting double-rod ISO 15552 adjustable-stroke cylinder, now discontinued. Its external stop screw lets you trim the extend stroke by up to 20 mm on-site, giving a usable 430-450 mm window from the 450 mm nominal maximum. It features a Ø32 mm rod, M27x2 rod thread, and a G1/2 port. The direct replacement is the SAIJ125X450-20, matching the interface, force, and adjust window.
The SAIJ successor retains the ISO 15552 mounting interface for direct reuse of FA, LB, and TC brackets, and uses an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life. Note this SKU lacks a magnet (-S) so it cannot take a sensor, and the stop screw sets end position only—it is not a load lock.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X450-20 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X450-20 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X450-20 |
| Bore size | Ø125 mm |
| Stroke | 450 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 SAIJ125X450-20 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 SAIJ125X450-20 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 SIJ125X450-20
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×450 | 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 SIJ125X450-20 Is Used
Press Tonnage Calibration
Fine-tune the extend end position by up to 20 mm on-site to set precise contact depth on heavy pressing operations without machining custom spacers.
Pallet Stop Positioning
Adjust the 430-450 mm extend stroke to accommodate varying pallet lengths on a transfer line, ensuring exact alignment at the workstation.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X450-20 with the SAIJ125X450-20
To replace the discontinued SIJ125X450-20, order the direct replacement SAIJ125X450-20, keeping the 20 mm adjust window (430-450 mm usable extend) and G1/2 port. Reuse your FA, LB, or TC ISO 15552 mounts. Because this SKU has no -S magnet, it cannot accept legacy CS1-B/DS1-B sensors. With a 450 mm stroke, use external guides to prevent rod bending and manage side loads. The stop screw trims position but does not hold load on air loss—use an external rod lock or SAIL/BSAI variant for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X450-20
- ✓ 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 SIJ125X450-20 FAQ
Yes, the SIJ125X450-20 is discontinued. The direct replacement is the SAIJ125X450-20.
The external stop screw allows trimming the extend stroke by up to 20 mm on-site (usable 430-450 mm). The stop sets end position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X450-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X450-20 replacement — usually within 7-8 hours.