This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ50X75-20S, 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 SIJ50X75-20S
The AirTAC SIJ50 Double Rod Adjustable Cylinder SIJ50X75-20S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 75mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ50X75-20S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAIJ50X75-20S
- 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 SIJ50X75-20S
The AirTAC SIJ50X75-20S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 50mm bore and 75mm maximum stroke. An external stop screw lets you trim the extend stroke by up to 20mm on-site, yielding a usable 55-75mm extension. As a direct replacement, the SAIJ50X75-20S matches this exact interface, force, and adjust window.
The SAIJ upgrade features an improved two Y-shaped one-way piston seal for lower start-up pressure and longer life. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches. Remember the stop screw sets end position only; it is not a load lock, so use an external rod lock or SAIL variant for held loads.
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-20S Technical Specifications
| Model | Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-20S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ50X75-20S |
| Bore size | Ø50 mm |
| Stroke | 75 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 SAIJ50X75-20S 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 SAIJ50X75-20S 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 SIJ50X75-20S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×75 | 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 SIJ50X75-20S Is Used
Custom Clamp Positioning
Allows operators to dial in the exact 55 to 75mm extend reach on-site to accommodate varying workpiece thicknesses without swapping cylinders.
Variable Length Diverter
Provides adjustable stroke for a routing gate that handles multiple package sizes, trimming the extend stroke by up to 20mm as needed.
Adjustable Push-off Mechanism
Enables fine-tuning of the end position for a part ejector, ensuring precise ejection distance even if machine parameters change.
Replacing the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-20S with the SAIJ50X75-20S
To replace the discontinued SIJ50X75-20S, order the direct replacement SAIJ50X75-20S, which preserves the 50mm bore, 75mm nominal stroke, 20mm adjust window, G1/4 port, and ISO 15552 mounting dimensions. Select the 20mm adjust window if your application requires field-tuning the extend stroke between 55mm and 75mm. Reuse FA, LB, or TC mounts directly. The -S suffix ensures a piston magnet is present for position sensing. For strokes of 300mm or longer, carefully verify side-load constraints to prevent guide bushing wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ50X75-20S
- ✓ 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 SIJ50X75-20S FAQ
Yes, the SIJ50X75-20S is discontinued. The direct replacement is the SAIJ50X75-20S, which shares the identical ISO 15552 interface, 50mm bore, 75mm stroke, 20mm adjust window, and G1/4 port.
The external stop screw allows you to trim the extend stroke by up to 20mm on-site, giving a usable extension range of 55-75mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ50X75-20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ50X75-20S replacement — usually within 7-8 hours.