Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 165mm 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
- Stroke165 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-20S
The AirTAC SAIJ125X165-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 145-165 mm usable travel window by allowing you to dial back the nominal 165 mm stroke by up to 20 mm. This bore generates 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it suited for heavy-duty positioning tasks.
This specific configuration includes a SUS420J2 stainless steel rod (option A) for improved corrosion resistance and a magnetic piston (-S) for position sensing. The extruded aluminum barrel features sensor grooves on both sides, supporting AirTAC CMSE reed and DMSE electronic solid-state switches. Mounting options are limited to the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 165 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 SAIJ125AX165-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×165 | 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 SAIJ125AX165-20S Is Used
Machine Changeover
Dial in the 145-165 mm travel window during product size changes to set exact end positions without physically swapping hardware.
Heavy Pressing
Leverage 6136 N of push force at 0.5 MPa for heavy assembly presses, using the rear stopper to precisely set the material engagement depth.
Variable End Stops
Adjust the retract end position on the fly for automated lines running mixed product batches, ensuring accurate physical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-20S the Right Cylinder?
Choose this 125 mm bore when a 63 mm cylinder (offering 1559 N push at 0.5 MPa) is insufficient, but a 160 mm bore (10053 N at 0.5 MPa) would be excessive. The adjustable rear stopper is ideal for fine-tuning the end position during commissioning or product changeover without swapping the cylinder or adding external stops. For strokes of 165 mm, the 32 mm rod and M27x2 thread handle side loads well, though long unsupported travel still requires an external guide.
When specifying an ISO 15552 replacement, match the 125 mm bore, 165 mm nominal stroke, 20 mm adjustment range, PT tapered port thread, and the -S magnet requirement. Note that the rear adjuster acts only as a travel stop and does not hold the load without live air; for fail-safe load holding, consider an AirTAC SAIL or BSAI cylinder instead.
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 SAIJ125AX165-20S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw lets you shorten the effective stroke by up to 20 mm, creating a 145-165 mm usable travel window. This allows fine-tuning of the retract end position at commissioning without changing the cylinder or adding external stops.
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