This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ50X150-75, 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 SIJ50X150-75
The AirTAC SIJ50 Double Rod Adjustable Cylinder SIJ50X150-75 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 150mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ50X150-75, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke150 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAIJ50X150-75
- 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 SIJ50X150-75
The AirTAC SIJ50X150-75 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, giving a usable 75-150 mm window from the 150 mm nominal maximum. The stop sets the end position but is not a load lock.
The direct replacement is the SAIJ50X150-75, sharing the same interface, force, and porting. The SAIJ upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. This non-magnet SKU cannot take a switch; for load holding without live air, use an external rod lock or SAIL/BSAI variant.
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X150-75 Technical Specifications
| Model | Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X150-75 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ50X150-75 |
| Bore size | Ø50 mm |
| Stroke | 150 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 SAIJ50X150-75 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 SAIJ50X150-75 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 SIJ50X150-75
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×150 | 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 SIJ50X150-75 Is Used
Variable Depth Drilling
A machining fixture requiring precise extend depth changes between part batches can dial in the exact 75-150 mm stroke on-site without swapping cylinders.
Adjustable Diverter Arm
A packaging line diverter needs different reach distances for various carton widths; the external stop screw allows rapid field tuning of the extend endpoint.
Tiered Push-Off Station
An unloading station that pushes parts off a roller table at multiple specific lengths uses the adjustable window to set exact ejection positions quickly.
Replacing the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X150-75 with the SAIJ50X150-75
To replace the discontinued SIJ50X150-75, order the direct replacement SAIJ50X150-75, reusing your existing FA, LB, or TC ISO 15552 mounts. The 75 mm adjust window lets you set the extend stroke anywhere from 75 to 150 mm on-site, which often beats fitting a fixed SAI cylinder with a bulky external stop. Because this SKU lacks the -S magnet, it cannot accept a magnetic switch for position sensing. Finally, for any stroke length at or above 300 mm, carefully verify your side-load conditions to prevent guide bushing wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ50X150-75
- ✓ 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 SIJ50X150-75 FAQ
Yes, the SIJ50X150-75 is discontinued. The direct replacement is the SAIJ50X150-75.
The nominal stroke is 150 mm, and the external stop screw lets you trim the extend stroke by up to 75 mm on-site, yielding a usable 75-150 mm window. The stop sets end position only; it is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ50X150-75
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ50X150-75 replacement — usually within 7-8 hours.