This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X900-75, 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 SIJ125X900-75
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X900-75 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 SAIJ125X900-75, 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 → SAIJ125X900-75
- 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 SIJ125X900-75
The AirTAC SIJ125X900-75 is a double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 900 mm maximum stroke. An external stop screw lets you trim the extend stroke by up to 75 mm on-site, yielding a usable 825-900 mm window. The SIJ line is discontinued; the direct replacement is the SAIJ125X900-75, matching the interface, force, and adjust window.
The SAIJ successor retains the ISO 15552 mounting dimensions for direct reuse of FA, LB, and TC brackets, and upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. Note this SKU lacks a -S magnet and cannot take a sensor. The stop screw sets end position but is not a load lock; use SAIL or BSAI for held loads.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-75 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-75 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X900-75 |
| 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 SAIJ125X900-75 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 SAIJ125X900-75 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 SIJ125X900-75
| 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 SIJ125X900-75 Is Used
Press Fit Tuning
A 125 mm bore assembly press requiring precise 825-900 mm end-position tuning to accommodate varying insert depths without swapping cylinders.
Adjustable Transfer Pusher
A heavy-duty transfer station pushing varied pallet sizes, using the 75 mm on-site stroke trim to alter the push-off distance quickly.
Variable Height Diverter
A high-force diverter gate needing field stroke adjustment to redirect different package profiles on a conveyor line accurately.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-75 with the SAIJ125X900-75
To replace the discontinued SIJ125X900-75, order the direct replacement SAIJ125X900-75, keeping the 75 mm adjust window and 900 mm nominal stroke. Choose the 75 mm adjust window if your extend stroke needs on-site tuning between 825 and 900 mm. Mounting interfaces (Basic, FA, LB, TC) are ISO 15552 standard. Because this SKU has no -S magnet, it cannot accept legacy CS1-B/DS1-B sensors. At 900 mm stroke, mind side-load and rod-bending forces; use external guides to prevent binding. The stop screw sets end position only—it is not a lock, and loads will drift on air loss.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X900-75
- ✓ 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 SIJ125X900-75 FAQ
Yes, the SIJ125X900-75 is discontinued. The direct replacement is the SAIJ125X900-75, sharing the same ISO 15552 interface, 125 mm bore, 900 mm stroke, 75 mm adjust window, G1/2 port, and mounting. The SAIJ also adds an upgraded piston seal.
The external stop screw provides a 75 mm adjust window, allowing the extend stroke to be trimmed from 900 mm down to 825 mm on-site. The stop sets position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X900-75
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X900-75 replacement — usually within 7-8 hours.