This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ50X80-50, 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 SIJ50 Double Rod Adjustable Cylinder SIJ50X80-50
The AirTAC SIJ50 Double Rod Adjustable Cylinder SIJ50X80-50 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 80mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ50X80-50, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke80 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAIJ50X80-50
- 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 SIJ50 Double Rod Adjustable Cylinder SIJ50X80-50
The AirTAC SIJ50X80-50 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. Its external stop screw trims the extend stroke by up to 50 mm on-site, yielding a usable 30-80 mm extend window from the 80 mm nominal maximum.
The direct replacement is the SAIJ50X80-50, matching the interface, force, and adjust window. The SAIJ upgrade uses a two Y-shaped one-way piston seal for low start-up pressure and long life. The stop sets end position only; it is not a load lock.
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X80-50 Technical Specifications
| Model | Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X80-50 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ50X80-50 |
| Bore size | Ø50 mm |
| Stroke | 80 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAIJ50X80-50 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The SAIJ50X80-50 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X80-50
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×80 | 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 SIJ50 Double Rod Adjustable Cylinder SIJ50X80-50 Is Used
Variable Depth Drilling
Adjusts the extend stroke on-site to match material thickness variations, preventing drill breakthrough without swapping cylinders.
Variable Length Diverter
Tunes the pusher extend distance on a packaging line to handle changing box sizes, ensuring accurate sorting.
Adjustable Stop Positioning
Sets a precise physical stop for incoming pallets, allowing quick reconfiguration of the stopping point as pallet types change.
Replacing the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X80-50 with the SAIJ50X80-50
To replace the discontinued SIJ50X80-50, order the direct replacement SAIJ50X80-50. Choose the 50 mm adjust window if you need to trim the 80 mm nominal extend down to 30 mm; a smaller window wastes stroke, a larger one adds length. Reuse FA, LB, or TC ISO 15552 mounts. This SKU lacks a -S magnet and cannot take a switch. For strokes over 300 mm, verify side-load limits. The stop screw is not a lock; for held loads use SAIL, BSAI, or an external rod lock.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ50X80-50
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X80-50 FAQ
Yes, the SIJ50X80-50 is discontinued. The direct replacement is the SAIJ50X80-50, offering the same ISO 15552 interface, 50 mm adjust window, G1/4 port, and force. The SAIJ family also adds an upgraded two Y-shaped one-way piston seal for longer life.
The external stop screw provides a 50 mm adjust window, shortening the 80 mm nominal extend stroke down to 30 mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ50X80-50
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ50X80-50 replacement — usually within 7-8 hours.