This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ50X80-75S, 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 SIJ50X80-75S
The AirTAC SIJ50 Double Rod Adjustable Cylinder SIJ50X80-75S 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 SAIJ50X80-75S, 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 → SAIJ50X80-75S
- 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 SIJ50X80-75S
The AirTAC SIJ50X80-75S is a double-acting double-rod ISO 15552 adjustable-stroke cylinder, now discontinued. The direct replacement is the SAIJ50X80-75S, matching the 50mm bore, 80mm nominal stroke, G1/4 port, and M16x1.5 rod thread. An external stop screw lets you trim the extend stroke by up to 75mm on-site, yielding a usable 5-80mm extend window. This stop sets the end position firmly but is not a load lock; use an external rod lock or SAIL variant for held loads.
The SAIJ upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B switches.
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X80-75S Technical Specifications
| Model | Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X80-75S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ50X80-75S |
| 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 SAIJ50X80-75S 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 SAIJ50X80-75S 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 SIJ50X80-75S
| 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 SIJ50X80-75S Is Used
Variable Depth Drilling
Dial in the exact extend stop on-site to control drill penetration depth across multiple material batches without swapping cylinders.
Adjustable Pusher Stroke
Trim the extend stroke by up to 75mm to accommodate changing package widths on a packaging line, ensuring precise indexing.
Tiered Pallet Positioning
Fine-tune the end position to engage varying pallet heights securely, relying on the external stop to set the exact reach.
Replacing the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X80-75S with the SAIJ50X80-75S
To replace the discontinued SIJ50X80-75S, order the direct replacement SAIJ50X80-75S, which retains the ISO 15552 mounting interface and the -S magnet. Choose the 75mm adjust window if your application requires cutting the 80mm nominal extend stroke down to a 5mm minimum. Reuse existing FA, LB, or TC mounts. The -S suffix provides legacy CS1-B/DS1-B sensor compatibility. For strokes of 300mm or longer, verify side-load limits to prevent excessive guide wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ50X80-75S
- ✓ 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 SIJ50X80-75S FAQ
Yes, the SIJ50X80-75S is discontinued. The direct replacement is the SAIJ50X80-75S, sharing the same ISO 15552 interface, 50mm bore, 80mm stroke, G1/4 port, and mounting options. The SAIJ family also adds upgraded piston seals and lock variants like SAIL.
The external stop screw provides a 75mm adjust window, shortening the 80mm nominal extend stroke down to 5mm. The stop sets end position but does not lock the load.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ50X80-75S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ50X80-75S replacement — usually within 7-8 hours.