Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 65mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke65 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-20
The AirTAC SAIJ125X65-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to fine-tune the end position during commissioning. Based on the 65 mm nominal stroke and the 20 mm adjustment code, this SKU provides a usable travel window of 45-65 mm. This specific adjustment range is ideal for dialing in exact end-stops without adding external physical stops to your machine frame.
Belonging to the 125 mm bore class, it generates 6136 N of push thrust and 5734 N of pull thrust at 0.5 MPa. The extruded aluminum barrel features sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic sensors. The standard carbon steel rod and PT tapered port threads are configured exactly to factory specifications for this SKU.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 65 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 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 (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×65 | 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 SAIJ125 Adjustable Cylinder SAIJ125X65-20 Is Used
Machine Setup Tuning
Dial in the exact 45-65 mm travel window during initial commissioning to perfectly align heavy clamping forces without machining custom spacers.
Product Changeover
Quickly adjust the rear stopper by up to 20 mm when switching the production line to a new product size variant, minimizing downtime.
Variable End Stops
Use the external screw to set precise retract positions for heavy-duty automated ejection systems operating at 0.5 to 0.9 MPa.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-20 the Right Cylinder?
Choose this 125 mm bore adjustable-stroke cylinder when your application requires high force combined with variable end-position tuning. If you need to step the force down, the neighboring 100 mm bore provides 3927 N of push force at 0.5 MPa. Because the rear adjuster acts strictly as a travel stop and the air cushions only decelerate the motion, neither will hold the load without live air pressure. For true fail-safe load holding, select the SAIL (air-released lock) or BSAI (clamp-lock) series instead.
When matching this ISO 15552 interchangeable cylinder for a replacement, verify the 125 mm bore, 65 mm stroke, 20 mm adjustment range, PT tapered port, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). The 32 mm rod and M27x2 thread provide high structural rigidity, though any application approaching the maximum 1500 mm stroke limit would require an external guide to prevent side-load damage.
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 SAIJ125 Adjustable Cylinder SAIJ125X65-20 FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push thrust and 5734 N of pull thrust. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster acts as a mechanical stop that lets you trim the 65 mm nominal stroke back by up to 20 mm, creating a 45-65 mm usable travel window. It is a stop, not a lock, and will not hold the load without live air pressure.
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