This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X125-50, 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 SIJ125X125-50
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X125-50 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 125mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X125-50, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke125 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X125-50
- 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 SIJ125X125-50
The AirTAC SIJ125X125-50 is a double-acting double-rod ISO 15552 adjustable-stroke cylinder, now discontinued. Its external stop screw lets you trim the extend stroke by up to 50 mm on-site, yielding a usable 75-125 mm extension out of the 125 mm nominal maximum. The direct replacement is the SAIJ125X125-50, matching the interface, force, and mounting.
The SAIJ successor retains the physical envelope but incorporates an upgraded piston seal utilizing two Y-shaped one-way elements for lower start-up pressure and longer life. Note this SKU lacks a magnet (-S) and cannot accept a sensor. The adjust stop sets end position but is not a lock; loads will drift on air loss, so use an external rod lock or SAIL/BSAI variant for holding.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X125-50 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X125-50 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X125-50 |
| Bore size | Ø125 mm |
| Stroke | 125 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 SAIJ125X125-50 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 SAIJ125X125-50 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 SIJ125X125-50
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×125 | 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 SIJ125X125-50 Is Used
Press Fit Tuning
Allows operators to dial in the exact 75-125 mm extend position for inserting bearings without machining hard stops.
Variable Format Flap Folding
Adjusts the extend endpoint on the fly to accommodate different carton depths in packaging lines.
Adjustable Pusher Stops
Sets precise product positioning against a backstop prior to strapping, with a 50 mm on-site trim window.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X125-50 with the SAIJ125X125-50
To replace the discontinued SIJ125X125-50, order the direct replacement SAIJ125X125-50, keeping the identical 125 mm bore, 125 mm stroke, and 50 mm adjust window. Mounting interfaces (Basic, FA, LB, TC) reuse existing ISO 15552 holes. Because this SKU has no -S magnet, it cannot support legacy CS1-B/DS1-B sensors. The stop screw trims extend position but does not lock the load. For strokes at or above 300 mm, verify side-load limits to prevent rod binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X125-50
- ✓ 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 SIJ125X125-50 FAQ
Yes, the SIJ125X125-50 is discontinued. The direct replacement is the SAIJ125X125-50, which shares the same ISO 15552 interface, 125 mm bore, 50 mm adjust window, and G1/2 port.
The external stop screw provides a 50 mm adjust window, allowing the 125 mm extend stroke to be shortened to 75 mm on-site.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X125-50
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X125-50 replacement — usually within 7-8 hours.