Airtac SAIJ50 Adjustable Cylinder SAIJ50AX300-20
The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50AX300-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø50mm bore and 300mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ50 mm
- Stroke300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 30 mm
About the Airtac SAIJ50 Adjustable Cylinder SAIJ50AX300-20
The AirTAC SAIJ50X300-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 280-300 mm usable travel window, allowing you to dial back the nominal 300 mm stroke by up to 20 mm during commissioning. Delivering 982 N of push force at 0.5 MPa, it bridges the gap between lighter 40 mm bores and heavier 63 mm units.
This variant uses a SUS420J2 stainless steel rod (option A) for improved corrosion resistance compared to standard carbon steel. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of CMSE reed or DMSE electronic switches. The rear adjuster acts purely as a mechanical stop to set the retract end position and does not lock the load without live air pressure.
Airtac SAIJ50 Adjustable Cylinder SAIJ50AX300-20 Technical Specifications
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50AX300-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø50 mm |
| Stroke | 300 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 stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / 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 | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ50 Adjustable Cylinder SAIJ50AX300-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×300 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ50 Adjustable Cylinder SAIJ50AX300-20 Is Used
Machine Changeover
Fine-tune the 280-300 mm retract end-stop during product size changeovers on a packaging line without swapping the cylinder.
End-Position Tuning
Dial in the exact bottoming position during commissioning to absorb mechanical variance and prevent hard impacts.
Variable Stops
Provide an adjustable physical stop for diverter arms or positioning jigs where the exact travel distance varies by batch.
Is the Airtac SAIJ50 Adjustable Cylinder SAIJ50AX300-20 the Right Cylinder?
Choose this 50 mm bore when an application requires 982 N of push force at 0.5 MPa (or 1374 N at 0.7 MPa), stepping up from the 628 N capacity of a 40 mm bore. An adjustable stroke is selected over a fixed SAI cylinder when you need variable end-stops for product changeovers or fine-tuning at setup without adding external mechanical stops. Because the nominal stroke is 300 mm, an external guide is recommended to prevent side-load damage to the rod and seals.
For a drop-in ISO 15552 replacement, match the 50 mm bore, 300 mm stroke, 20 mm adjustment, PT tapered ports, and the SUS420J2 rod material. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2. Note that the rear adjuster is a travel stop, not a lock; for load-holding without live air, use an external rod lock or pilot-operated check valve.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ50 Adjustable Cylinder SAIJ50AX300-20 FAQ
At 0.5 MPa, it provides 982 N of push force and 825 N of pull force. At 0.7 MPa, the push force increases to 1374 N.
The rear adjuster screw lets you mechanically shorten the 300 mm stroke by up to 20 mm, giving a usable travel window of 280-300 mm. It acts as a physical stop and does not hold the load without live air pressure.
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