This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ50X80-40, 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 SIJ50 Double Rod Adjustable Cylinder SIJ50X80-40
The AirTAC SIJ50 Double Rod Adjustable Cylinder SIJ50X80-40 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 SAIJ50X80-40, 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 → SAIJ50X80-40
- 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 SIJ50 Double Rod Adjustable Cylinder SIJ50X80-40
The AirTAC SIJ50X80-40 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 40 mm on-site, yielding a usable 40-80 mm extend window from the 80 mm nominal maximum. The 50 mm bore uses a G1/4 port, a Ø20 mm rod with an M16x1.5 thread, and 30 mm adjustable cushions at each end. This exact SKU lacks a magnet (-S), so it cannot accept a magnetic switch.
Because the SIJ line is end-of-life, the required direct replacement is the SAIJ50X80-40, retaining the same ISO 15552 mounting interface, bore, force, and port. The SAIJ family incorporates an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. Remember the stop screw sets the end position but is not a load lock; use an external rod lock or SAIL/BSAI variant for held loads.
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X80-40 Technical Specifications
| Model | Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X80-40 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ50X80-40 |
| 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 SAIJ50X80-40 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 SAIJ50X80-40 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 SIJ50X80-40
| 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 SIJ50X80-40 Is Used
Diverter Gate Positioning
Allows operators to manually dial in the exact extend stroke from 40 to 80 mm on-site to hit a specific diverter angle without swapping cylinders.
Variable Depth Carton Sealing
Provides a mechanical stop to set precise pressing depth for varying package sizes, ensuring consistent seal quality without reprogramming logic.
Adjustable Product Stopper
Enables field tuning of the stop finger extension to accommodate different product heights on a packaging line, offering mechanical end-position certainty.
Replacing the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X80-40 with the SAIJ50X80-40
To replace this discontinued SIJ50X80-40, order the direct replacement SAIJ50X80-40, which preserves the G1/4 port, 80 mm nominal stroke, 40 mm adjust window, and FA/LB/TC mounting compatibility. Selecting the adjust window is critical: this 40 mm window allows on-site extend stroke tuning from 40 to 80 mm without machining. Because this specific SKU has no -S magnet, it cannot support legacy CS1-B/DS1-B sensors; confirm if a sensing variant is required. For any stroke over 300 mm, carefully manage side-load forces to prevent rod bearing wear. The external stop screw only sets the end position; it does not hold the load on air loss.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ50X80-40
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X80-40 FAQ
Yes, the SIJ50X80-40 is discontinued. The direct replacement is the SAIJ50X80-40, sharing the same ISO 15552 interface, 50 mm bore, 80 mm stroke, 40 mm adjust window, and G1/4 port.
The external stop screw provides a 40 mm adjust window, allowing you to trim the 80 mm nominal extend stroke down to 40 mm on-site.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ50X80-40
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ50X80-40 replacement — usually within 7-8 hours.