This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ63X450-20, 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 SIJ63 Double Rod Adjustable Cylinder SIJ63X450-20
The AirTAC SIJ63 Double Rod Adjustable Cylinder SIJ63X450-20 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 450mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ63X450-20, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke450 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAIJ63X450-20
- 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 SIJ63 Double Rod Adjustable Cylinder SIJ63X450-20
The AirTAC SIJ63X450-20 is a double-acting double-rod ISO 15552 adjustable-stroke cylinder, now discontinued. The direct replacement is the SAIJ63X450-20, matching the 63mm bore, 450mm stroke, G3/8 port, and mounting interface. An external stop screw lets you trim the extend stroke by up to 20mm on-site, giving a usable extension range of 430-450mm. This stop sets the end position but is not a load lock.
The SAIJ upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This non-magnet SKU cannot take a switch; for load holding on air loss use an external rod lock or SAIL/BSAI variant.
Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X450-20 Technical Specifications
| Model | Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X450-20 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ63X450-20 |
| Bore size | Ø63 mm |
| Stroke | 450 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| 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 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAIJ63X450-20 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø63mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 kgf | |
The SAIJ63X450-20 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X450-20
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×450 | 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 SIJ63 Double Rod Adjustable Cylinder SIJ63X450-20 Is Used
Variable Press Stroke
Trimming the extend stroke by up to 20mm on-site lets operators fine-tune a 430-450mm pressing depth without changing the cylinder body.
End-Position Diverter
External stop screw tuning allows a diverter arm to reach 430-450mm to accommodate different product lengths on a sorting line.
Replacing the Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X450-20 with the SAIJ63X450-20
To replace the discontinued SIJ63X450-20, order the direct replacement SAIJ63X450-20, reusing your existing ISO 15552 FA, LB, or TC mounts. Choose the 20mm adjust window if you need 430-450mm end-position tuning. Because this 450mm stroke exceeds 300mm, use an external guide to prevent rod bending and side-load wear. This SKU lacks a -S magnet and cannot support legacy CS1-B/DS1-B sensors. Remember the stop screw is not a brake; a plain cylinder drifts on air loss, so fit a pilot-operated check valve for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ63X450-20
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X450-20 FAQ
Yes, the SIJ63X450-20 is discontinued. The direct replacement is the SAIJ63X450-20. It shares the same ISO 15552 interface, 63mm bore, 450mm stroke, 20mm adjust window, G3/8 port, and mounting options. The SAIJ also uses an upgraded two Y-shaped one-way piston seal for lower start-up pressure and longer life.
The external stop screw window is 20mm, allowing you to shorten the 450mm maximum extend stroke down to 430mm on-site. The stop sets end position and is not a load lock; speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ63X450-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ63X450-20 replacement — usually within 7-8 hours.