This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ50X25-30, 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 SIJ50X25-30
The AirTAC SIJ50 Double Rod Adjustable Cylinder SIJ50X25-30 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 25mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ50X25-30, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke25 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAIJ50X25-30
- 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 SIJ50X25-30
The AirTAC SIJ50X25-30 is a double-acting, double-rod ISO 15552 adjustable-stroke cylinder with a 50 mm bore and 25 mm maximum extend stroke. This discontinued unit uses an external stop screw to trim the extend stroke by up to 30 mm on-site, yielding a usable 0-25 mm end position.
The direct replacement is the SAIJ50X25-30, matching the interface, force, and mounting. The SAIJ family introduces an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. Note this SKU lacks a -S magnet, so it cannot accept a magnetic switch.
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X25-30 Technical Specifications
| Model | Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X25-30 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ50X25-30 |
| Bore size | Ø50 mm |
| Stroke | 25 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 SAIJ50X25-30 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 SAIJ50X25-30 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 SIJ50X25-30
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×25 | 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 SIJ50X25-30 Is Used
Short-Stroke Clamping
Adjustable end-position clamping of castings on a machining fixture, allowing operators to tune the 0-25 mm extend precisely to part variance without shimming.
Transfer Diverter
Actuating a conveyor diverter gate where the exact extend stop must be dialed in on-site to match carton profiles, using the 30 mm trim window to prevent overtravel.
Product Pusher
Pushing lightweight packages into a wrapping lane, where the external stop screw fine-tunes the extend endpoint to accommodate varying product widths dynamically.
Replacing the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X25-30 with the SAIJ50X25-30
To replace the discontinued SIJ50X25-30, order the direct replacement SAIJ50X25-30, which preserves the 30 mm adjust window, 25 mm nominal stroke, and G1/4 port. Choose the 30 mm adjust window if your fixture requires on-site end-position tuning within a 0-25 mm travel band. Mounting interfaces (FA, LB, TC) reuse directly under ISO 15552. Because this SKU has no -S magnet, it cannot support sensing; add an external rod lock or pilot-operated check valve for load holding, as the stop screw sets position but is not a lock.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ50X25-30
- ✓ 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 SIJ50X25-30 FAQ
Yes, the AirTAC SIJ50X25-30 is discontinued. The direct replacement is the SAIJ50X25-30. It shares the same ISO 15552 interface, 50 mm bore, 25 mm stroke, 30 mm adjust window, G1/4 port, and mounting options, while adding an upgraded SAI piston seal.
The external stop screw provides a 30 mm trim window, shortening the 25 mm nominal extend stroke on-site. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ50X25-30
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ50X25-30 replacement — usually within 7-8 hours.