Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 145mm 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
- Stroke145 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-40
The AirTAC SAIJ125X145-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel back by up to 40 mm. This creates a usable movement window of 105 to 145 mm, enabling precise end-position tuning at commissioning without swapping out the cylinder or adding external stops. Delivering a robust 8590 N of push force at 0.7 MPa, it is built for heavy-duty operations.
This model features a SUS420J2 stainless steel rod (option A) for enhanced resistance to surface wear and corrosion in harsh environments. It uses PT tapered ports sized G1/2 and operates within a speed range of 30-500 mm/s. The rear adjuster acts strictly as a mechanical stop to set the travel limit and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 145 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 SAIJ125AX145-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×145 | 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 SAIJ125AX145-40 Is Used
Machine Setup & Changeover
Dial in the exact retract position within the 105-145 mm window during machine commissioning or when switching product sizes, avoiding the need to physically swap cylinders.
Heavy-Duty Positioning
Leverage the 8590 N push force at 0.7 MPa to move heavy pallets or fixtures, using the rear stopper to fine-tune the final resting position within a few millimeters.
Variable End-Stop Trimming
Adjust the effective stroke up to 40 mm on the fly to compensate for mechanical wear or slight fixture misalignment over the machine's lifecycle.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-40 the Right Cylinder?
Selecting this 125 mm bore cylinder makes sense when your application requires the substantial thrust of an 8590 N force at 0.7 MPa but still demands on-the-fly mechanical end-position adjustments during product changeovers. If your process needs less force, stepping down to a 100 mm bore yields 5497 N at 0.7 MPa, whereas staying with this size provides a 40 mm adjustment window that a fixed-stroke SAI cannot match. To replace an ISO 15552 cylinder, match the 125 mm bore, 145 mm stroke, 40 mm adjuster, PT G1/2 port, and desired mounting from the reduced SAIJ set: Basic, FA, LB, TC, FTC, TCM1, or TCM2.
Because the 145 mm stroke is relatively short for this large bore, side-loading is less of a concern than with longer strokes, but the load should still be guided to prevent binding. Remember that the rear adjuster and air cushions only decelerate and set the travel end; they do not function as a lock. For load-holding without live air, consider an external pilot-operated check valve or the AirTAC SAIL or BSAI series.
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 SAIJ125AX145-40 FAQ
At a standard operating pressure of 0.7 MPa, this 125 mm bore cylinder provides a push force of 8590 N and a pull force of 5734 N. At the maximum rated pressure of 1.0 MPa, it can deliver up to 6136 N of push force.
The SAIJ125X145-40 has a nominal stroke of 145 mm with a rear adjusting screw that allows you to shorten the effective stroke by up to 40 mm. This provides a usable travel window of 105 to 145 mm, letting you set the exact end position at commissioning without external stops.
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