This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ50X75-75S, 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 SIJ50X75-75S
The AirTAC SIJ50 Double Rod Adjustable Cylinder SIJ50X75-75S 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 SAIJ50X75-75S, 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 → SAIJ50X75-75S
- 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 SIJ50X75-75S
The AirTAC SIJ50X75-75S 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 75 mm on-site, giving a usable 0-75 mm window from the 75 mm nominal maximum. The stop sets end position only and is not a load lock. This 50 mm bore uses a G1/4 port, a 20 mm rod with an M16x1.5 thread, and 30 mm adjustable cushions. The direct replacement is the SAIJ50X75-75S, retaining the same interface, force, and mounting.
The SAIJ successor adds an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life. Because this is a -S model, it includes a piston magnet for legacy CS1-B/DS1-B switches.
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-75S Technical Specifications
| Model | Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-75S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ50X75-75S |
| 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 SAIJ50X75-75S 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 SAIJ50X75-75S 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 SIJ50X75-75S
| 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 SIJ50X75-75S Is Used
Variable Depth Drilling
Trimming the extend stroke by up to 75 mm on-site allows a single cylinder to drive a drill head to multiple precise depths without swapping the entire actuator assembly.
Adjustable Carton Sealing
When packaging varying box heights, the external stop screw provides a rapid 0-75 mm extend adjustment to maintain consistent downward pressure for the sealing head.
Variable Stroke Diverting
A diverter arm on a conveyor can be tuned exactly to the required 0-75 mm protrusion for different product widths, ensuring positive contact without overtravel.
Replacing the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-75S with the SAIJ50X75-75S
To replace the discontinued SIJ50X75-75S, order the direct replacement SAIJ50X75-75S, keeping the 75 mm nominal stroke and 75 mm adjust window. Reuse your existing FA, LB, or TC ISO 15552 mounts. The -S suffix means a piston magnet is present for CS1-B/DS1-B switches. For strokes of 300 mm or longer, verify side-load limits to prevent guide wear. Remember the adjust screw sets end position but does not lock the load on air loss; for held loads use an external rod lock or the SAIL/BSAI variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ50X75-75S
- ✓ 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 SIJ50X75-75S FAQ
Yes, the SIJ50X75-75S is discontinued. The direct replacement is the SAIJ50X75-75S. It shares the same ISO 15552 interface, 50 mm bore, 75 mm stroke, 75 mm adjust window, G1/4 port, and mounting options, but features an upgraded piston seal.
The external stop screw allows you to trim the extend stroke by up to 75 mm on-site (usable 0-75 mm window). The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ50X75-75S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ50X75-75S replacement — usually within 7-8 hours.