This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ80X400-20S, 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 SIJ80X400-20S
The AirTAC SIJ80 Dual Axis Adjustable Cylinder SIJ80X400-20S 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 SAIJ80X400-20S, 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 → SAIJ80X400-20S
- 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 SIJ80X400-20S
The AirTAC SIJ80X400-20S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 400 mm nominal stroke and a built-in piston magnet. An external stop screw lets you trim the extend stroke by up to 20 mm on-site, giving a usable extend range of 380-400 mm. The stop sets the end position but is not a load lock. This 80 mm bore uses a G3/8 port, a 25 mm rod, and 36 mm adjustable cushions.
The direct replacement is the SAIJ80X400-20S, sharing the same ISO 15552 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. A plain cylinder drifts on air loss; for held loads use an external rod lock or SAIL/BSAI variant.
Airtac SIJ80 Dual Axis Adjustable Cylinder SIJ80X400-20S Technical Specifications
| Model | Airtac SIJ80 Dual Axis Adjustable Cylinder SIJ80X400-20S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ80X400-20S |
| 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 SAIJ80X400-20S 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 SAIJ80X400-20S 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 SIJ80X400-20S
| 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 SIJ80X400-20S Is Used
Press Fit Calibration
Trimming the extend stroke by up to 20 mm on-site allows precise positioning for pressing bearings without machining hard stops.
Variable Length Diverter
Adjusting the extend end position lets a diverter gate accommodate different package sizes on a single conveyor line.
Adjustable End Stop Pusher
A 400 mm stroke pusher can be fine-tuned by 20 mm to create exact spacing between pallets prior to wrapping.
Replacing the Airtac SIJ80 Dual Axis Adjustable Cylinder SIJ80X400-20S with the SAIJ80X400-20S
To replace the discontinued SIJ80X400-20S, order the direct replacement SAIJ80X400-20S, which preserves the G3/8 port, 25 mm rod, and ISO 15552 mounting. Choose the 20 mm adjust window if you need 380-400 mm extend tuning. Reuse FA, LB, or TC mounts. The -S suffix means a piston magnet is present for CS1-B/DS1-B switches (the SAIJ uses current switches). At 400 mm stroke, use external guides to prevent rod bending and manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ80X400-20S
- ✓ 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 SIJ80X400-20S FAQ
Yes, the SIJ80X400-20S is discontinued. The direct replacement is the SAIJ80X400-20S. It shares the same ISO 15552 interface, 80 mm bore, 400 mm stroke, 20 mm adjust window, G3/8 port, and mounting, but adds an upgraded two Y-shaped one-way piston seal.
The external stop screw window is 20 mm, allowing a usable extend stroke of 380-400 mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ80X400-20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ80X400-20S replacement — usually within 7-8 hours.