This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X900-50, 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 SIJ125X900-50
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X900-50 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 SAIJ125X900-50, 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 → SAIJ125X900-50
- 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 SIJ125X900-50
The AirTAC SIJ125X900-50 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 50 mm on-site, giving a usable forward travel of 850-900 mm. The direct replacement is the SAIJ125X900-50, matching the interface, force, cushion, and mounting.
The SAIJ upgrade incorporates an improved two-piece Y-shaped piston seal for lower start-up pressure and longer life. Note this SKU lacks a -S magnet and cannot accept a sensor. The stop screw sets end position only; it is not a load lock, so use an external rod lock for holding.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-50 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-50 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X900-50 |
| 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 SAIJ125X900-50 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 SAIJ125X900-50 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 SIJ125X900-50
| 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 SIJ125X900-50 Is Used
Press Fit Tuning
Final insertion depth of large bearings requires field stroke tuning; the 50 mm adjust window allows precise positioning without remounting the 125 mm body.
Variable Length Diverter
A heavy divert gate handling varied pallet sizes needs on-site stroke trimming to hit exact stop positions dynamically along the 850-900 mm travel.
Adjustable Stroke Stopper
End-of-line pallet stoppers use the external screw to shorten the extend stroke by up to 50 mm, adapting to new box footprints while retaining the ISO 15552 mount.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-50 with the SAIJ125X900-50
To replace the discontinued SIJ125X900-50, order the direct replacement SAIJ125X900-50, keeping the 900 mm nominal stroke and 50 mm adjust window. Size both ways using 0.5 MPa force: the 100 mm bore pushes 3927 N (underpowered), while the 160 mm bore pushes 10053 N. Maintain the ISO 15552 mounting interchange via FA, LB, or TC dimensions. Because this SKU has no -S magnet, it cannot support legacy CS1-B/DS1-B sensors. At a 900 mm stroke, rod bending and side-load risks are high; always use external guides to prevent premature seal wear. The stop screw merely sets the end position and is not a lock—never rely on it or the 40 mm air cushion to hold a load on air loss, as the piston will drift. For held loads, specify a SAIL or BSAI lock variant, or an external pilot-operated check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X900-50
- ✓ 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 SIJ125X900-50 FAQ
Yes, the SIJ125X900-50 is discontinued. The direct replacement is the SAIJ125X900-50. It matches the 125 mm bore, 900 mm stroke, 50 mm adjust window, G1/2 port, and ISO 15552 mounting interface, while adding an upgraded piston seal.
The 50 mm external stop screw trims the extend stroke on-site (usable 850-900 mm). Speed is 30-500 mm/s, with 40 mm adjustable cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X900-50
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X900-50 replacement — usually within 7-8 hours.