This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X900-40, 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 SIJ125X900-40
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X900-40 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 SAIJ125X900-40, 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 → SAIJ125X900-40
- 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 SIJ125X900-40
The AirTAC SIJ125X900-40 is a double-acting double-rod ISO 15552 adjustable-stroke cylinder, now discontinued and superseded by the direct replacement SAIJ125X900-40. It features a 125mm bore, G1/2 port, and an external stop screw that lets you trim the extend stroke by up to 40mm on-site, yielding a usable extend range of 860-900mm. The stop sets the end position but is not a load lock.
The SAIJ replacement retains the ISO 15552 mounting interface but 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; for load holding on air loss, use an external rod lock or SAIL/BSAI variant.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-40 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-40 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X900-40 |
| 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 SAIJ125X900-40 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 SAIJ125X900-40 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 SIJ125X900-40
| 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 SIJ125X900-40 Is Used
Heavy Press Tonnage Calibration
Fine-tune the extend end position on-site by up to 40mm to dial in exact contact and crush depth on large pressing operations without re-engineering the fixture.
Oversize Pallet Diverter
Adjust the extend stroke within the 860-900mm window to accommodate varying pallet lengths on the fly, ensuring positive physical contact without overtravel.
Variable Depth Material Push-off
Trim the extend stroke on a 125mm bore cylinder to push heavy loads off a storage rack at precise depths, adapting the stop distance for different product runs.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-40 with the SAIJ125X900-40
To replace the discontinued SIJ125X900-40, order the direct replacement SAIJ125X900-40, matching the 125mm bore, 900mm max stroke, 40mm adjust window, and G1/2 port. Choose the 40mm adjust window if your end-position tuning falls within 860-900mm. Reuse FA, LB, or TC mounts via the ISO 15552 interface. Because this SKU lacks the -S magnet, it cannot accept legacy CS1-B/DS1-B sensors. For the 900mm stroke, use external guides to prevent rod bending and side-load damage. The cylinder does not hold loads without live air; use an external rod lock for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X900-40
- ✓ 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 SIJ125X900-40 FAQ
Yes, the SIJ125X900-40 is discontinued. The direct replacement is the SAIJ125X900-40, which shares the identical ISO 15552 interface, 125mm bore, 900mm stroke, 40mm adjust window, and G1/2 port. The SAIJ family also upgrades the piston seal to two Y-shaped one-way elements for longer life.
The external stop screw provides a 40mm adjust window, allowing you to shorten the 900mm nominal extend stroke down to 860mm. The stop sets end position and is not a load lock; speed is 30-500mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X900-40
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X900-40 replacement — usually within 7-8 hours.