This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ50X80-20, 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 SIJ50X80-20
The AirTAC SIJ50 Double Rod Adjustable Cylinder SIJ50X80-20 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 SAIJ50X80-20, 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 → SAIJ50X80-20
- 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 SIJ50X80-20
The AirTAC SIJ50X80-20 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. A G1/4 port and Ø20mm rod frame a 50mm bore that pushes 982N and pulls 825N at 0.5MPa. The external stop screw lets you trim the extend stroke by up to 20mm on-site, yielding a 60-80mm usable window from the 80mm nominal maximum. This stop sets the end position; it is not a load lock.
The direct replacement is the SAIJ50X80-20, matching the bore, force, adjust window, and mounting. The SAIJ upgrade uses a two Y-shaped one-way piston seal for low start-up pressure and long life. This non-magnet SKU cannot take a switch.
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X80-20 Technical Specifications
| Model | Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X80-20 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ50X80-20 |
| 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 SAIJ50X80-20 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 SAIJ50X80-20 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 SIJ50X80-20
| 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 SIJ50X80-20 Is Used
Crimp Height Calibration
Trimming the extend stroke by up to 20mm on-site lets operators set exact crimp depth without machining custom spacers.
Variable Package Reject
Adjusting the 80mm extend window accommodates different carton widths on a transfer line without swapping cylinders.
Probe Contact Force
Setting a 60mm extend stroke ensures a testing probe touches the target without overshooting, protecting the Ø20mm rod.
Replacing the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X80-20 with the SAIJ50X80-20
To replace the discontinued SIJ50X80-20, order the direct replacement SAIJ50X80-20, reusing your FA, LB, or TC ISO 15552 mounts. Choose the 20mm adjust window to tune the extend end-point without shims. Because this SKU lacks the -S magnet, it cannot accept a legacy CS1-B/DS1-B sensor. For stroke lengths >=300mm, verify side-load guide tolerance. Remember the stop screw sets position only; for load holding on air loss, specify an external rod lock or the SAIL/BSAI variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ50X80-20
- ✓ 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 SIJ50X80-20 FAQ
Yes, the SIJ50X80-20 is discontinued. The direct replacement is the SAIJ50X80-20. It matches the ISO 15552 interface, 50mm bore, 80mm stroke, 20mm adjust window, G1/4 port, and mounting hardware.
The double-acting double-rod 50mm bore has a G1/4 port and pushes 982N (pulls 825N) at 0.5MPa, 1374N at 0.7MPa, and 1767N at 0.9MPa. The external stop screw provides a 20mm adjust window, making the usable extend stroke 60-80mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ50X80-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ50X80-20 replacement — usually within 7-8 hours.