This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X450-100, 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 SIJ125X450-100
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X450-100 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 SAIJ125X450-100, 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 → SAIJ125X450-100
- 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 SIJ125X450-100
The AirTAC SIJ125X450-100 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. Its external stop screw lets you trim the extend stroke by up to 100 mm on-site, giving a usable 350-450 mm range from the 450 mm nominal maximum. The direct replacement is the SAIJ125X450-100, matching the interface, force, and mounting.
The stop screw sets the end position but is not a load lock; use an external rod lock or SAIL/BSAI variant for held loads. The SAIJ upgrade uses a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this SKU lacks a -S magnet and cannot take a switch.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X450-100 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X450-100 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X450-100 |
| 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 SAIJ125X450-100 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 SAIJ125X450-100 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 SIJ125X450-100
| 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 SIJ125X450-100 Is Used
Press Tonnage Calibration
Needs field stroke tuning to set precise material contact. The 100 mm stop window trims the extend stroke on-site, preventing over-travel during press setup.
Variable-Length Diverter
Requires adjusting the actuator endpoint for different package sizes. The external stop screw allows quick 350-450 mm stroke changes without swapping cylinders.
Adjustable End-Stop Pusher
Demands on-site endpoint tuning for mixed pallet depths. The stop screw sets the exact 125 mm bore push position, handling up to 6136 N at 0.5 MPa.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X450-100 with the SAIJ125X450-100
To replace this discontinued SIJ125X450-100, use the direct replacement SAIJ125X450-100, retaining the ISO 15552 mounting interface and G1/2 port. Choose the 100 mm adjust window if your setup requires trimming the 450 mm extend stroke down to a 350 mm minimum on-site. Mounting options include Basic, FA, LB, and TC. Because this SKU has no -S suffix, it cannot accept a magnetic switch; for sensing, select an SAIJ-S model. As the 450 mm stroke is long, ensure external guides to prevent rod bending and manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X450-100
- ✓ 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 SIJ125X450-100 FAQ
Yes, the SIJ125X450-100 is discontinued. The direct replacement is the SAIJ125X450-100. It shares the same ISO 15552 interface, 125 mm bore, 450 mm stroke, 100 mm adjust window, G1/2 port, and mounting options. The SAIJ features an upgraded two Y-shaped one-way piston seal for longer life.
The external stop screw provides a 100 mm adjust window, shortening the extend stroke from the 450 mm nominal maximum down to 350 mm. The stop sets end position only; it is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X450-100
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X450-100 replacement — usually within 7-8 hours.