This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X900-20, 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 SIJ125X900-20
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X900-20 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 SAIJ125X900-20, 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 → SAIJ125X900-20
- 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 SIJ125X900-20
The AirTAC SIJ125X900-20 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 20 mm on-site, yielding a usable 880-900 mm stroke. The nominal 900 mm is the maximum.
The direct replacement is the SAIJ125X900-20, sharing the same interface, force, and mounting. The SAIJ upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. Note: the stop screw sets end position only; it is not a load lock.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-20 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-20 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X900-20 |
| 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 SAIJ125X900-20 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 SAIJ125X900-20 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 SIJ125X900-20
| 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 SIJ125X900-20 Is Used
Press Fit Alignment
Dialing in the final 20 mm of extend stroke on-site to perfectly seat bearings without over-traveling.
Pallet Stop Tuning
Adjusting the extend stop position by up to 20 mm to accommodate varying pallet lengths.
Heavy Load Positioning
Fine-tuning the end-of-stroke contact point for heavy 313 kg vertical lifts requiring exact placement.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-20 with the SAIJ125X900-20
To replace the discontinued SIJ125X900-20, order the direct replacement SAIJ125X900-20, reusing your existing ISO 15552 FA, LB, or TC mounts. This 125 mm bore provides 6136 N at 0.5 MPa and 8590 N at 0.7 MPa. The 20 mm adjust window is ideal for final positioning tweaks. Because this SKU lacks the -S magnet, it cannot accept a magnetic switch; confirm sensing needs. For the 900 mm stroke, use external guides to prevent rod bending and side-load damage. For load holding on air loss, use an external rod lock or the SAIL/BSAI variant, as the stop screw and cushion are not locks.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X900-20
- ✓ 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 SIJ125X900-20 FAQ
Yes, the SIJ125X900-20 is discontinued. The direct replacement is the SAIJ125X900-20. It shares the same ISO 15552 interface, 125 mm bore, 900 mm stroke, 20 mm adjust window, G1/2 port, and mounting options, while adding an upgraded piston seal.
The theoretical max is 1251 kgf at 1.0 MPa. The external stop screw allows trimming the extend stroke by up to 20 mm on-site (usable stroke 880-900 mm). The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X900-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X900-20 replacement — usually within 7-8 hours.