This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ63X50-40STC, 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 SIJ63X50-40STC
The AirTAC SIJ63 Double Rod Adjustable Cylinder SIJ63X50-40STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 50mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ63X50-40STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke50 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAIJ63X50-40STC
- 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 SIJ63X50-40STC
The AirTAC SIJ63X50-40STC is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 63 mm bore, 50 mm nominal stroke, and a 40 mm on-site extend-trim window. An external stop screw lets you trim the extend stroke by up to 40 mm on-site, yielding a usable 10-50 mm extend range. The stop sets end position only; it is not a load lock. It includes a TC mounting interface and a -S piston magnet.
Because SIJ is end-of-life, the direct replacement is the SAIJ63X50-40STC, retaining the same ISO 15552 interface, force, adjust window, and port. The SAIJ upgrade uses an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. A plain cylinder drifts on air loss; for held loads use SAIL/BSAI or an external rod lock.
Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X50-40STC Technical Specifications
| Model | Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X50-40STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ63X50-40STC |
| Bore size | Ø63 mm |
| Stroke | 50 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 SAIJ63X50-40STC 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 SAIJ63X50-40STC 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 SIJ63X50-40STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×50 | 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 SIJ63X50-40STC Is Used
Variable Pitch Pushing
Trimming the extend stroke on-site by up to 40 mm allows a single actuator to push parts of varying lengths into a machining station without swapping cylinders.
Adjustable Transfer Diverter
Field-tuning the extend end position lets operators set the exact reach of a diverter arm over a conveyor as product widths change on the line.
Variable Depth Pallet Stop
An external stop screw provides a precise method to alter the stopping depth for cartons of different sizes arriving at a palletizing cell.
Replacing the Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X50-40STC with the SAIJ63X50-40STC
To replace the discontinued SIJ63X50-40STC, order the direct replacement SAIJ63X50-40STC, which preserves the 63 mm bore, 50 mm nominal stroke, 40 mm adjust window, G3/8 port, TC mount, and -S magnet. Choose the 40 mm adjust window if you need to trim the extend stroke by up to 40 mm on-site; the stop screw sets end position but is not a lock. The TC mount provides a trunnion interface for pivoting. The -S magnet enables CS1-B/DS1-B switches. For stroke >=300 mm, confirm side-load guidance to prevent rod deflection.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ63X50-40STC
- ✓ 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 SIJ63X50-40STC FAQ
Yes, the SIJ63X50-40STC is discontinued. The direct replacement is the SAIJ63X50-40STC, which matches the ISO 15552 interface, 63 mm bore, 50 mm nominal stroke, 40 mm adjust window, G3/8 port, and TC mount. The SAIJ family also features an upgraded piston seal.
The external stop screw window is 40 mm, allowing you to trim the 50 mm extend stroke down to 10 mm on-site. The stop sets end position only and does not lock the load.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ63X50-40STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ63X50-40STC replacement — usually within 7-8 hours.