This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ50X800-40, 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 SIJ50X800-40
The AirTAC SIJ50 Double Rod Adjustable Cylinder SIJ50X800-40 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 800mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ50X800-40, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke800 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAIJ50X800-40
- 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 SIJ50X800-40
The AirTAC SIJ50X800-40 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 50 mm bore and 800 mm nominal stroke. An external stop screw lets you trim the extend stroke by up to 40 mm on-site, giving a usable extend range of 760-800 mm. The stop sets the end position and is not a load lock.
The direct replacement is the SAIJ50X800-40, retaining the same ISO 15552 mounting 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. Note this SKU lacks a -S magnet and cannot take a switch.
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X800-40 Technical Specifications
| Model | Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X800-40 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ50X800-40 |
| Bore size | Ø50 mm |
| Stroke | 800 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 SAIJ50X800-40 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 SAIJ50X800-40 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 SIJ50X800-40
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×800 | 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 SIJ50X800-40 Is Used
Sorting Diverter Tuning
Field-tune the 760-800 mm extend stroke on a package sorting line to adjust the diverter reach for varying box sizes without swapping cylinders.
Press Stroke Adjustment
Trim the extend stroke by up to 40 mm on-site to set precise end positions for light-duty pressing or crimping tasks requiring exact 50 kg contact force.
Pallet Stop Calibration
Calibrate the stopping position of pallets on a 800 mm stroke conveyor by adjusting the external stop screw to accommodate pallet length variations.
Replacing the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X800-40 with the SAIJ50X800-40
To replace the discontinued SIJ50X800-40, order the direct replacement SAIJ50X800-40. Choose the 40 mm adjust window if your field stroke tuning falls within 760-800 mm. Reuse FA, LB, or TC mounts via the ISO 15552 interface. Because this SKU has no -S magnet, it cannot support legacy CS1-B/DS1-B sensors. At 800 mm stroke, mind side-load and rod-bending; use external guides to prevent premature wear. A plain cylinder does not hold loads on air loss—the cushion only decelerates. For held loads, use an external rod lock or SAIL/BSAI variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ50X800-40
- ✓ 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 SIJ50X800-40 FAQ
Yes, the SIJ50X800-40 is discontinued. The direct replacement is the SAIJ50X800-40. It shares the same ISO 15552 interface, 50 mm bore, 800 mm stroke, 40 mm adjust window, G1/4 port, and mounting options. The SAIJ family also features an upgraded two Y-shaped one-way piston seal for lower start-up pressure and longer life.
The external stop screw provides a 40 mm adjust window, allowing you to trim the extend stroke on-site from the 800 mm maximum down to 760 mm. The stop sets end position only; it is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ50X800-40
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ50X800-40 replacement — usually within 7-8 hours.