This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ50X75-40S, 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 SIJ50X75-40S
The AirTAC SIJ50 Double Rod Adjustable Cylinder SIJ50X75-40S 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 SAIJ50X75-40S, 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 → SAIJ50X75-40S
- 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 SIJ50X75-40S
The AirTAC SIJ50X75-40S is a double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 50 mm bore and 75 mm maximum extend stroke. An external stop screw lets you trim the extend stroke by up to 40 mm on-site, yielding a usable 35-75 mm window. This SIJ model is discontinued; the direct replacement is the SAIJ50X75-40S, sharing the same interface, force, and adjust window.
The SAIJ upgrade incorporates an improved two-piece Y-shaped piston seal for lower start-up pressure and longer life. The -S suffix denotes a built-in 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/BSAI variant for held loads.
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-40S Technical Specifications
| Model | Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-40S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ50X75-40S |
| 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 SAIJ50X75-40S 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 SAIJ50X75-40S 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 SIJ50X75-40S
| 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 SIJ50X75-40S Is Used
Variable Depth Spot Facing
Machine operators trim the extend stroke by up to 40 mm on-site to machine multiple casting depths with a single cylinder setup, avoiding manual rod changes.
Adjustable Carton Flap Folding
Packaging lines quickly tune the 35-75 mm extend window to accommodate varying box heights on the fly without swapping out the entire actuator assembly.
Tiered Product Diverting
Diverter arms use the external stop screw to precisely set the push distance for different product widths moving down the conveyor belt.
Replacing the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-40S with the SAIJ50X75-40S
To replace the discontinued SIJ50X75-40S, order the direct replacement SAIJ50X75-40S, which preserves the 50 mm bore, 75 mm nominal stroke, 40 mm adjust window, G1/4 port, and ISO 15552 mounting. Select the 40 mm adjust window if your application requires trimming the extend stroke down to a 35 mm minimum. Mounting attachments (FA, LB, TC) reuse the ISO 15552 interface. The -S magnet supports legacy CS1-B/DS1-B sensors. Since the 75 mm stroke is under 300 mm, side-load rod deflection is minimal.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ50X75-40S
- ✓ 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 SIJ50X75-40S FAQ
Yes, the AirTAC SIJ50X75-40S is discontinued. The direct replacement is the SAIJ50X75-40S. It shares the same ISO 15552 interface, 50 mm bore, 75 mm stroke, 40 mm adjust window, and G1/4 port. The SAIJ family also features an upgraded piston seal for longer life.
The external stop screw allows you to trim the extend stroke by up to 40 mm on-site, creating a usable 35-75 mm window. The stop sets end position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ50X75-40S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ50X75-40S replacement — usually within 7-8 hours.