This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ63X250-20, 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 SIJ63X250-20
The AirTAC SIJ63 Double Rod Adjustable Cylinder SIJ63X250-20 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 250mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ63X250-20, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke250 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAIJ63X250-20
- 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 SIJ63X250-20
The AirTAC SIJ63X250-20 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 63 mm bore and 250 mm maximum stroke. An external stop screw lets you trim the extend stroke by up to 20 mm on-site, yielding a usable 230-250 mm extension. The direct replacement is the SAIJ63X250-20, matching the bore, force, G3/8 port, and mounting interface. The stop screw sets the end position but is not a load lock; use an external rod lock or SAIL variant for held loads.
The SAIJ upgrade features an improved two-piece Y-shaped piston seal for lower start-up pressure, and because it is a non-magnet SKU (-S omitted), it cannot accept a magnetic switch.
Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X250-20 Technical Specifications
| Model | Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X250-20 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ63X250-20 |
| Bore size | Ø63 mm |
| Stroke | 250 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 SAIJ63X250-20 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 SAIJ63X250-20 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 SIJ63X250-20
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×250 | 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 SIJ63X250-20 Is Used
Variable Pitch Forming
A metalforming line needing on-site stroke tuning to adjust part bend depth within a 20 mm window without swapping the entire cylinder.
Adjustable Diverter Gate
A conveyor diverter requiring field stroke trimming to accommodate varying package sizes on the fly, using the 230-250 mm extend range.
Custom Packaging Pusher
A packaging pusher that needs precise end-position adjustment for different carton depths, relying on the external stop screw to set the exact extend endpoint.
Replacing the Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X250-20 with the SAIJ63X250-20
To replace the discontinued SIJ63X250-20, order the direct replacement SAIJ63X250-20, matching the 250 mm stroke and 20 mm adjust window. Size both ways using 0.5 MPa push force: the neighbouring 50 mm bore yields 982 N, while the 80 mm bore yields 2513 N. Reuse your FA, LB, or TC ISO 15552 mounts. This SKU lacks the -S magnet, so it cannot take legacy CS1-B/DS1-B sensors. For strokes of 300 mm or longer, verify your side-load limits. The external stop screw sets end position only; it is not a lock, so add a pilot-operated check valve or external rod lock for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ63X250-20
- ✓ 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 SIJ63X250-20 FAQ
Yes, the SIJ63X250-20 is discontinued. The direct replacement is the SAIJ63X250-20, which shares the identical ISO 15552 interface, 63 mm bore, 250 mm stroke, 20 mm adjust window, and G3/8 port. The SAIJ family also uses an upgraded two-piece Y-shaped piston seal for longer life.
The external stop screw provides a 20 mm adjust window, allowing you to trim the extend stroke from the 250 mm maximum down to 230 mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ63X250-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ63X250-20 replacement — usually within 7-8 hours.