This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X900-75S, 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 SIJ125X900-75S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X900-75S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 900mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X900-75S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke900 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X900-75S
- 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 SIJ125X900-75S
The AirTAC SIJ125X900-75S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. An external stop screw lets you trim the extend stroke by up to 75 mm on-site, yielding a usable 825-900 mm extension out of the 900 mm nominal maximum.
The direct replacement is the SAIJ125X900-75S, retaining the same interface, force, and mounts. The SAIJ upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Note the stop screw sets end position only; it is not a load lock.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-75S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-75S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X900-75S |
| Bore size | Ø125 mm |
| Stroke | 900 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 SAIJ125X900-75S 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 SAIJ125X900-75S 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 SIJ125X900-75S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×900 | 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 SIJ125X900-75S Is Used
Long-stroke press ejection
Ejecting large formed parts from a hydraulic press requires a long 900 mm reach, but varying die heights demand on-site stroke trimming within the 75 mm window to prevent overtravel.
Variable-depth pallet positioning
Depalletizing mixed-height loads benefits from field stroke tuning, allowing the 125 mm bore to adjust its extend endpoint precisely without reprogramming the motion controller.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-75S with the SAIJ125X900-75S
To replace the SIJ125X900-75S, order the direct replacement SAIJ125X900-75S, which preserves the G1/2 port, M27x2 rod thread, and ISO 15552 mounting interfaces (Basic, FA, LB, TC). Choose the 75 mm adjust window if your fixture needs field tuning within 825-900 mm; remember the stop sets end position and is not a lock. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches (the SAIJ uses current AirTAC switches). Because the 900 mm stroke exceeds 300 mm, use external guides to prevent rod bending and manage side loads. For load holding on air loss, use an external rod lock or the SAIL/BSAI variants, as cushions only decelerate.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X900-75S
- ✓ 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 SIJ125X900-75S FAQ
Yes, the SIJ125X900-75S is discontinued. The direct replacement is the SAIJ125X900-75S. It shares the same ISO 15552 interface, 125 mm bore, 900 mm stroke, 75 mm adjust window, G1/2 port, and mounting options, while upgrading to a two Y-shaped one-way piston seal for longer life.
The external stop screw allows you to trim the extend stroke by up to 75 mm on-site, giving a usable extension range of 825-900 mm. The stop sets end position only and does not hold the load on air loss.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X900-75S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X900-75S replacement — usually within 7-8 hours.