This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ50X700-20, 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 SIJ50X700-20
The AirTAC SIJ50 Double Rod Adjustable Cylinder SIJ50X700-20 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 700mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ50X700-20, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke700 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAIJ50X700-20
- 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 SIJ50X700-20
The AirTAC SIJ50X700-20 is a double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 50mm bore and 700mm maximum stroke. An external stop screw lets you trim the extend stroke by up to 20mm on-site, yielding a usable 680-700mm extension. Note this SKU lacks a magnet (-S) and cannot take a magnetic switch. The SIJ series is discontinued; the direct replacement is the SAIJ50X700-20, matching the 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. The stop screw sets the end position but is not a lock; loads drift on air loss. For held loads, use an external rod lock or the SAIL/BSAI variants. At 700mm, mind rod bending and use external guides.
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X700-20 Technical Specifications
| Model | Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X700-20 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ50X700-20 |
| Bore size | Ø50 mm |
| Stroke | 700 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 SAIJ50X700-20 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 SAIJ50X700-20 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 SIJ50X700-20
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×700 | 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 SIJ50X700-20 Is Used
Variable Push-Off Stations
Tuning the extend stroke by up to 20mm on-site allows a 50mm bore push-off station to adapt to changing part widths without remounting the ISO 15552 cylinder.
Adjustable Transfer Diverter
A 700mm extend stroke diverter can be precisely dialed back 20mm to accommodate new conveyor lane widths, ensuring exact end-position placement.
Calibrated Forming Stops
Packaging equipment needing a 680-700mm reach can fine-tune the external stop screw to set exact carton forming endpoints without changing the maximum nominal stroke.
Replacing the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X700-20 with the SAIJ50X700-20
To replace the discontinued SIJ50X700-20, order the direct replacement SAIJ50X700-20, reusing your existing ISO 15552 FA, LB, or TC mounts. The 20mm adjust window provides a 680-700mm extend stroke; verify this covers your positioning needs before swapping. This non-magnetic SKU cannot support legacy CS1-B/DS1-B sensors. Because the 700mm stroke exceeds 300mm, account for side-load and rod-bending by incorporating external guides to prevent premature seal wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ50X700-20
- ✓ 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 SIJ50X700-20 FAQ
Yes, the SIJ50X700-20 is discontinued. The direct replacement is the SAIJ50X700-20, which shares the identical ISO 15552 interface, 50mm bore, 700mm stroke, 20mm adjust window, and G1/4 port. You can swap it directly using your existing mounts.
This 50mm bore cylinder has a 20mm external stop screw window (usable extend 680-700mm). The stop screw sets end position but is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ50X700-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ50X700-20 replacement — usually within 7-8 hours.