Airtac SAIJ125 Adjustable Cylinder SAIJ125X165-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X165-40 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 SAIJ125X165-40
The AirTAC SAIJ125X165-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers a robust 6136N push force at 0.5MPa, utilizing a 32mm carbon steel rod and a PT G1/2 port. The built-in rear stopper allows you to trim the nominal 165mm stroke back by up to 40mm, creating a precise 125-165mm usable travel window for exact end-position tuning.
This adjustable design eliminates the need to swap cylinders or add external stops during product changeovers. It includes variable air cushions at both ends (40mm cushion length) to absorb kinetic energy, operating at speeds of 30-500mm/s. The extruded aluminum barrel features sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic sensors.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X165-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X165-40 |
|---|---|
| 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 SAIJ125X165-40
| 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 SAIJ125X165-40 Is Used
Variable End-Position Stops
Dial in the exact retraction point within the 125-165mm window during machine commissioning to accommodate different product sizes without changing the cylinder.
Heavy Clamping Force
Leverage the 6136N push force at 0.5MPa for securing heavy workpieces, using the 40mm adjustment to prevent over-travel and optimize the clamp position.
Product Line Changeover
Quickly adapt automated assembly lines to new part dimensions by turning the rear adjuster screw, avoiding the downtime of physically swapping cylinders.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X165-40 the Right Cylinder?
Select this 125mm bore model when your application requires heavy thrust up to 6136N at 0.5MPa (or 8590N at 0.7MPa) alongside a variable end-stop. If your force requirements are lower, stepping down to the 100mm bore yields 3927N at 0.5MPa, whereas moving up to the 160mm bore provides 10053N. The SAIJ125X165-40 is ideal for dialing in exact travel distances during commissioning without replacing the cylinder.
Because the nominal stroke is 165mm, an external guide is recommended to manage side loads. Remember that the rear adjuster acts only as a mechanical travel stop, not a lock; the cylinder cannot hold a load without live air pressure. For drop prevention, consider an AirTAC SAIL or BSAI cylinder. This model uses PT tapered port threads and supports the SAIJ mounting subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125X165-40 FAQ
The cylinder has a rear adjusting screw that acts as a mechanical stopper, allowing you to shorten the effective stroke by up to 40mm. This provides a usable travel window of 125-165mm so you can fine-tune the end position at commissioning without swapping the cylinder.
At 0.5MPa operating pressure, this 125mm bore cylinder provides a push force of 6136N and a pull force of 5734N. At 0.7MPa, the push force increases to 8590N.
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