This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ50X75-50, 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 SIJ50X75-50
The AirTAC SIJ50 Double Rod Adjustable Cylinder SIJ50X75-50 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 SAIJ50X75-50, 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 → SAIJ50X75-50
- 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 SIJ50X75-50
The AirTAC SIJ50X75-50 is a double-acting double-rod ISO 15552 adjustable-stroke cylinder, now discontinued and superseded by the direct replacement SAIJ50X75-50. It features a 50 mm bore, a G1/4 port, and an external stop screw that lets you trim the extend stroke by up to 50 mm on-site, giving a usable 25-75 mm extension out of the 75 mm nominal maximum. The stop screw strictly sets the end position; it is not a load lock, and the cylinder cannot hold a load without live air.
The SAIJ replacement retains the exact interface and force but adds an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life. This non-magnetic SKU lacks a -S sensor groove, so it cannot accept legacy CS1-B or DS1-B switches.
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-50 Technical Specifications
| Model | Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-50 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ50X75-50 |
| 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 SAIJ50X75-50 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 SAIJ50X75-50 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 SIJ50X75-50
| 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 SIJ50X75-50 Is Used
Variable Depth Drilling
A machining fixture requiring field stroke tuning to set precise drilling depths between 25 and 75 mm without swapping the entire cylinder.
Adjustable Diverter Arm
A conveyor sorting station where the extend stroke must be trimmed on-site to accommodate different package widths on the fly.
Variable Height Stopper
An assembly line pallet stopper needing a 50 mm adjustment window to halt varying product heights before a manual workstation.
Replacing the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-50 with the SAIJ50X75-50
To replace the discontinued SIJ50X75-50, order the direct replacement SAIJ50X75-50, which matches the 50 mm bore, 75 mm stroke, 50 mm adjust window, G1/4 port, and FA/LB/TC mountings. The 50 mm adjust window is ideal if your extend stroke needs frequent on-site tuning between 25 and 75 mm. Because this is a non-magnetic SKU without the -S option, it cannot accept position sensors. For any stroke over 300 mm, carefully manage side loading to prevent excessive guide wear. For load-holding on air loss, do not rely on the stop screw or the 30 mm adjustable cushions; specify an external rod lock or a pilot-operated check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ50X75-50
- ✓ 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 SIJ50X75-50 FAQ
Yes, the SIJ50X75-50 is discontinued. The direct replacement is the SAIJ50X75-50, which shares the identical ISO 15552 interface, 50 mm bore, 75 mm stroke, 50 mm adjust window, G1/4 port, and mounting options.
The external stop screw provides a 50 mm adjust window, allowing you to trim the extend stroke from the 75 mm nominal maximum down to 25 mm on-site.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ50X75-50
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ50X75-50 replacement — usually within 7-8 hours.