Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-40S 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 SAIJ125X65-40S
The AirTAC SAIJ125X65-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 25 to 65 mm for exact end-position tuning. It delivers a robust 6136 N push force at 0.5 MPa, scaling up to 11045 N at 0.9 MPa, making it well-suited for heavy-duty positioning tasks. This unit includes a magnet for CMSE reed and DMSE electronic sensors.
The integrated rear stopper allows you to dial in the stroke during commissioning without adding external stops or swapping the cylinder. It features a 32 mm carbon steel rod with an M27x2 thread, designed to handle significant side loads. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting options cover Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-40S |
|---|---|
| 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 SAIJ125X65-40S
| 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 SAIJ125X65-40S Is Used
Heavy-Duty End-Stop Tuning
Dial in the exact clamping distance on large fixtures by trimming the stroke within the 25-65 mm window during machine commissioning.
Product Size Changeovers
Quickly adapt a heavy conveyor diverter arm to accommodate different package lengths without physically replacing the pneumatic cylinder.
Variable Positioning Stops
Provide an adjustable physical stop for heavy pallets on an assembly line, relying on the 6136 N thrust at 0.5 MPa to move loads reliably.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X65-40S the Right Cylinder?
Select this 125 mm bore cylinder when a smaller 100 mm bore (providing 3927 N push at 0.5 MPa) lacks the necessary thrust, but you want to avoid stepping up to a 160 mm frame. The 40 mm adjustment range is perfect for product changeovers on a line, letting you vary the end-stop on the fly instead of relying on a fixed-stroke SAI cylinder. Remember that the rear adjuster functions strictly as a travel stop and does not hold the load without live air; for true load-holding, consider an external rod lock, a pilot-operated check valve, or the SAIL/BSAI series.
When replacing an ISO 15552 cylinder, verify the 125 mm bore, 65 mm nominal stroke, 40 mm adjustment range, PT tapered port threads, and the -S magnet requirement. Ensure your mounting choice falls within the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, TCM2), as FB, CA, CB, and CR configurations are not supported.
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 SAIJ125X65-40S FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. If you increase the operating pressure to 0.9 MPa, the push force reaches 11045 N.
The rear adjuster acts as a mechanical stop that lets you shorten the effective travel from the 65 mm nominal stroke down to as little as 25 mm. It only sets the end position and does not lock the load without continuous air pressure.
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