This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ50X75-50S, 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 SIJ50X75-50S
The AirTAC SIJ50 Double Rod Adjustable Cylinder SIJ50X75-50S 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 SAIJ50X75-50S, 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 → SAIJ50X75-50S
- 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 SIJ50X75-50S
The AirTAC SIJ50X75-50S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. Its external stop screw lets you trim the extend stroke by up to 50 mm on-site, yielding a usable 25-75 mm extend window from the 75 mm nominal maximum. As a direct replacement, the SAIJ50X75-50S matches this bore, force, adjust window, and mounting interface exactly.
The SAIJ upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. The stop screw sets the end position but is not a load lock; for held loads use SAIL or BSAI variants. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches.
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-50S Technical Specifications
| Model | Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ50X75-50S |
| 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 SAIJ50X75-50S 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 SAIJ50X75-50S 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 SIJ50X75-50S
| 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 SIJ50X75-50S Is Used
Divergent Part Pushing
Adjusting the extend stop on-site by up to 50 mm allows a single cylinder to push parts of varying widths without swapping the entire actuator.
Variable Transfer Stops
Trimming the extend stroke dynamically creates different physical stop positions along a conveyor lane for sorting mixed product lengths.
Variable Depth Sealing
Fine-tuning the extend end position provides precise depth control for sealing jaws accommodating multiple package sizes on the same line.
Replacing the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-50S with the SAIJ50X75-50S
To replace the discontinued SIJ50X75-50S, order the direct replacement SAIJ50X75-50S, which preserves the 50 mm bore, 75 mm stroke, 50 mm adjust window, G1/4 port, and ISO 15552 mounting. Choose the 50 mm adjust window when you need to trim the extend stroke by up to 50 mm on-site; remember the stop sets end position and is not a lock. Mounting options include Basic, FA, LB, and TC. The -S suffix ensures a piston magnet is present for switch sensing. For strokes of 300 mm or longer, verify side-load limits to prevent rod binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ50X75-50S
- ✓ 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 SIJ50X75-50S FAQ
Yes, the AirTAC SIJ50X75-50S is discontinued. The direct replacement is the SAIJ50X75-50S, which maintains the same ISO 15552 interface, 50 mm bore, 75 mm stroke, 50 mm adjust window, G1/4 port, and mounting footprint.
This double-acting double-rod cylinder has a 50 mm bore with a 50 mm adjust window (usable extend stroke 25-75 mm). It uses a G1/4 port and adjustable air cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ50X75-50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ50X75-50S replacement — usually within 7-8 hours.