Airtac SAIJ125 Adjustable Cylinder SAIJ125X165-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X165-50 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 SAIJ125X165-50
The AirTAC SAIJ125X165-50 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 115-165 mm usable travel window, allowing you to trim the nominal 165 mm stroke by up to 50 mm during commissioning. Delivering 6136 N of push force at 0.5 MPa, this extruded aluminum barrel design features a 32 mm carbon steel rod and a PT G1/2 port.
This adjustable-stroke configuration eliminates the need to swap cylinders or bolt on external stops when fine-tuning retract end positions. The rear adjuster acts purely as a mechanical stop for deceleration alongside the variable air cushions, meaning it will not hold a load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X165-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X165-50 |
|---|---|
| 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 SAIJ125X165-50
| 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 SAIJ125X165-50 Is Used
Machine Changeover
Dial in the 115-165 mm travel window during product size changes without replacing the cylinder or adding external mechanical stops.
End-Position Tuning
Fine-tune the retract stroke by up to 50 mm at commissioning to perfect the seating of heavy 6136 N press operations.
Variable End Stops
Adjust the rear stop screw on the ISO 15552 profile cylinder to accommodate flexible positioning requirements on the assembly line.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X165-50 the Right Cylinder?
Selecting this 125 mm bore cylinder makes sense when your application demands high thrust (6136 N at 0.5 MPa) but requires variable end-stop positioning. If you need less force, stepping down to a 100 mm bore yields 3927 N of push force. The SAIJ125X165-50 is specified with a PT tapered port thread, a 32 mm carbon steel rod, and no sensor magnet. It supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR options.
Because the nominal stroke is 165 mm, an external guide is not strictly mandated for side loads, but the robust 32 mm rod thread helps manage moderate bending moments. Remember that the rear adjuster is a travel stop, not a locking mechanism; maintain live air to hold position. If you need to detect position, you would need the -S magnet variant to use AirTAC CMSE reed or DMSE electronic sensors.
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 SAIJ125X165-50 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 1251 kgf.
The rear adjuster acts as a mechanical stop that lets you shorten the 165 mm nominal stroke by up to 50 mm, creating a 115-165 mm usable travel window. It only sets the end position and does not lock the load without live air.
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