This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ50X80-75, 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 SIJ50X80-75
The AirTAC SIJ50 Double Rod Adjustable Cylinder SIJ50X80-75 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 80mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ50X80-75, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke80 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAIJ50X80-75
- 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 SIJ50X80-75
The AirTAC SIJ50X80-75 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, yielding a usable 5-80 mm extend window from the 80 mm nominal maximum. Because this SKU lacks a -S suffix, it has no magnet and cannot accept a magnetic switch.
The direct replacement is the SAIJ50X80-75, preserving the ISO 15552 mounting interface, bore, stroke, force, and port. The SAIJ family incorporates an upgraded piston seal utilizing two Y-shaped one-way elements for low start-up pressure and extended life. Note the external stop sets end position only; it is not a load lock, and a plain cylinder drifts on air loss. For held loads, use an external rod lock or the SAIL/BSAI variants.
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X80-75 Technical Specifications
| Model | Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X80-75 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ50X80-75 |
| Bore size | Ø50 mm |
| Stroke | 80 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 SAIJ50X80-75 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 SAIJ50X80-75 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 SIJ50X80-75
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×80 | 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 SIJ50X80-75 Is Used
Variable Depth Forming
A press operation requiring field tuning of the extend stroke from 5 to 80 mm to accommodate different material thicknesses without changing the entire cylinder.
Adjustable Transfer Stops
An inline material handling gate that uses the 75 mm on-site stroke trim to alter the physical stop position for varying package sizes on the fly.
Modulated Sealing Pressure
A carton sealing station that adjusts the extend end-position externally to maintain precise contact force across different box heights.
Replacing the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X80-75 with the SAIJ50X80-75
To replace the discontinued SIJ50X80-75, order the direct replacement SAIJ50X80-75, which matches the 50 mm bore, 80 mm nominal stroke, 75 mm adjust window, and G1/4 port. Choose the 75 mm adjust window if your application requires field tuning the extend stroke down to a 5 mm minimum. Mounting options include Basic, FA, LB, and TC brackets. This non-magnetic SKU cannot support position sensing; add the -S suffix on SAIJ if you need legacy CS1-B/DS1-B sensor accuracy. For strokes of 300 mm or longer, verify side-load limits to prevent guide failure. Remember the stop screw sets end position but does not lock the load on air loss.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ50X80-75
- ✓ 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 SIJ50X80-75 FAQ
Yes, the SIJ50X80-75 is discontinued. The direct replacement is the SAIJ50X80-75. It preserves the ISO 15552 interface, 50 mm bore, 80 mm stroke, 75 mm adjust window, and G1/4 port. The SAIJ family also adds an upgraded piston seal and lock variants like SAIL and BSAI.
The external stop screw provides a 75 mm adjust window, allowing the extend stroke to be shortened on-site from the 80 mm nominal maximum down to 5 mm. The stop sets end position only; it is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ50X80-75
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ50X80-75 replacement — usually within 7-8 hours.