This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ80X400-50, 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 SIJ80 Dual Axis Adjustable Cylinder SIJ80X400-50
The AirTAC SIJ80 Dual Axis Adjustable Cylinder SIJ80X400-50 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 400mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ80X400-50, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke400 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAIJ80X400-50
- 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 SIJ80 Dual Axis Adjustable Cylinder SIJ80X400-50
The AirTAC SIJ80X400-50 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 400 mm nominal stroke and a G3/8 port. An external stop screw lets you trim the extend stroke by up to 50 mm on-site, yielding a usable 350-400 mm window. The direct replacement is the SAIJ80X400-50, matching the interface, bore, force, and mounting.
The SAIJ successor introduces an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and long life. Note this SKU lacks a -S magnet and cannot take a sensor. The stop screw sets end position but is not a lock; use an external rod lock for held loads.
Airtac SIJ80 Dual Axis Adjustable Cylinder SIJ80X400-50 Technical Specifications
| Model | Airtac SIJ80 Dual Axis Adjustable Cylinder SIJ80X400-50 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ80X400-50 |
| Bore size | Ø80 mm |
| Stroke | 400 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M20×1.5 |
| 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, 36 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAIJ80X400-50 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
The SAIJ80X400-50 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SIJ80 Dual Axis Adjustable Cylinder SIJ80X400-50
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×400 | 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 SIJ80 Dual Axis Adjustable Cylinder SIJ80X400-50 Is Used
Press Fit Tuning
Allows precise on-site stroke trimming up to 50 mm to set exact pressing depth without machining spacers.
Variable Length Diverter
Adjusts the extend position on a packaging line to accommodate different carton lengths on the fly.
Adjustable End Stop
Sets a physical end position for palletizing tasks where the exact contact point varies by load height.
Replacing the Airtac SIJ80 Dual Axis Adjustable Cylinder SIJ80X400-50 with the SAIJ80X400-50
To replace the discontinued SIJ80X400-50, order the direct replacement SAIJ80X400-50, which preserves the 400 mm stroke, 50 mm adjust window, G3/8 port, and 25 mm rod. Choose the 50 mm adjust window if your extend stroke needs field tuning between 350-400 mm. Mounting options include FA, LB, and TC. Because the 400 mm stroke exceeds 300 mm, support the rod against side-load bending and use external guides. This non-magnetic SKU cannot accept a sensor; for load holding on air loss, use an external rod lock or check valve, as the stop screw is not a brake.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ80X400-50
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SIJ80 Dual Axis Adjustable Cylinder SIJ80X400-50 FAQ
Yes, the SIJ80X400-50 is discontinued. The direct replacement is the SAIJ80X400-50, offering the same ISO 15552 interface, 400 mm stroke, 50 mm adjust window, and G3/8 port. The SAIJ family also features an upgraded piston seal.
The external stop screw window is 50 mm, allowing the extend stroke to be shortened from 400 mm down to 350 mm on-site. The stop sets position but is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ80X400-50
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ80X400-50 replacement — usually within 7-8 hours.