Airtac SAIJ125 Adjustable Cylinder SAIJ125AX65-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX65-40S 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 SAIJ125AX65-40S
The AirTAC SAIJ125X65-40-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 25 to 65 mm, allowing you to dial in the exact retract position without swapping components. Operating at 0.5 MPa, it delivers 6136 N of push force and 5734 N of pull force, making it suitable for heavy-duty positioning tasks.
This model includes a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and a PT tapered port thread. The extruded aluminum barrel features sensor grooves on both sides, and the integrated magnet (-S) is fully compatible with AirTAC CMSE reed and DMSE electronic solid-state switches for precise end-of-stroke detection. The variable air cushions at both ends work alongside the rear stopper to decelerate the load smoothly.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX65-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX65-40S |
|---|---|
| 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 SAIJ125AX65-40S
| 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 SAIJ125AX65-40S Is Used
Machine Changeover
Dial in the retract position during product size transitions on a packaging line using the 25-65 mm adjustable window.
End-Stop Tuning
Fine-tune the final retract position at commissioning without fabricating custom external stopper blocks.
Heavy-Duty Positioning
Leverage the 6136 N push force to move heavy fixtures while relying on the rear screw for exact placement.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX65-40S the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial force combined with a highly variable end-stop. If your process needs less thrust, stepping down to an 80 mm bore yields 2513 N of push force at 0.5 MPa while saving space. The SAIJ125X65-40-S is chosen over a fixed-stroke SAI cylinder when a product line requires frequent changeovers, as the rear screw fine-tunes the retract position in seconds without adding external stops.
When matching an ISO 15552 replacement, verify the 125 mm bore, 65 mm nominal stroke, 40 mm adjustment range, PT port thread, and the required mounting accessory from the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that the rear adjuster functions strictly as a travel stop and does not hold the load without live air pressure; for true load-holding, consider an AirTAC SAIL or BSAI cylinder. Because the stroke is short, side-load risks are minimal, but long unsupported strokes still need an external guide.
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 SAIJ125AX65-40S FAQ
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective stroke by up to 40 mm. This creates a usable travel window between 25 and 65 mm, which is set during commissioning without changing the cylinder itself.
At a standard 0.5 MPa operating pressure, the SAIJ125X65-40-S generates 6136 N of push force and 5734 N of pull force. It can reach a maximum push force of 11045 N at 0.9 MPa.
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