This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ50X25-20, 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 SIJ50X25-20
The AirTAC SIJ50 Double Rod Adjustable Cylinder SIJ50X25-20 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 SAIJ50X25-20, 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 → SAIJ50X25-20
- 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 SIJ50X25-20
The AirTAC SIJ50X25-20 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. An external stop screw lets you trim the extend stroke by up to 20 mm on-site, yielding a usable 5-25 mm extension from the 25 mm nominal maximum.
The direct replacement is the SAIJ50X25-20, preserving the interface, force, and mounting. The SAIJ upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The stop sets end position but is not a load lock; use SAIL or BSAI for held loads.
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X25-20 Technical Specifications
| Model | Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X25-20 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ50X25-20 |
| 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 SAIJ50X25-20 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 SAIJ50X25-20 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 SIJ50X25-20
| 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 SIJ50X25-20 Is Used
Short-Stroke Clamping
Provides adjustable 5-25 mm clamping travel for machining fixtures, allowing operators to dial in the exact grip length on-site.
Product Diverter Gate
Tunes the extend stop position precisely to deflect varying package sizes on a conveyor without re-plumbing the pneumatic system.
Sealing Head Press
Sets the precise downward crush distance for heat-sealing heads, compensating for material thickness variations on the fly.
Replacing the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X25-20 with the SAIJ50X25-20
To replace the discontinued SIJ50X25-20, order the direct replacement SAIJ50X25-20. Choose the 20 mm adjust window if your exact extend position needs on-site tuning between 5 and 25 mm. Mounting reuses ISO 15552 interfaces (FA, LB, TC). This SKU lacks the -S magnet, so it cannot accept a magnetic switch. Because the 25 mm stroke is under 300 mm, side-load rod deflection is minimal.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ50X25-20
- ✓ 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 SIJ50X25-20 FAQ
Yes, the SIJ50X25-20 is discontinued. The direct replacement is the SAIJ50X25-20, which shares the same ISO 15552 interface, 50 mm bore, 25 mm stroke, 20 mm adjust window, and G1/4 port.
The external stop screw allows trimming the extend stroke by up to 20 mm on-site, yielding a usable 5-25 mm extension. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ50X25-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ50X25-20 replacement — usually within 7-8 hours.