Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 55mm 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
- Stroke55 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-40
The AirTAC SAIJ125X55-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling you to fine-tune the retract end position during commissioning. It provides a usable travel window of 15 to 55 mm, letting you shorten the nominal 55 mm stroke by up to 40 mm without adding external stops.
Operating at 0.15 to 1.0 MPa, this 125 mm bore generates a push force of 6136 N and a pull force of 5734 N at 0.5 MPa. It features a carbon steel piston rod with an M27x2 thread, dual-sided sensor grooves, and variable air cushions at both ends. The barrel is extruded aluminum, and the standard porting is PT tapered G1/2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 55 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 SAIJ125X55-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×55 | 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 SAIJ125X55-40 Is Used
Product Changeovers
Dial in the 15 to 55 mm travel window on the fly to accommodate different package lengths without changing the cylinder.
End-Position Tuning
Fine-tune the retract stop during machine commissioning to achieve exact clamping or pressing positions without external spacers.
Assembly Line Stops
Use the adjustable rear stopper to vary the resting height of parts presented to downstream robotic or automated stations.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-40 the Right Cylinder?
Choose this adjustable-stroke model when a machine requires variable end-stops or frequent product-size changeovers, avoiding the need to swap out a fixed-stroke SAI cylinder. If your thrust requirements are lower, stepping down to a 100 mm bore yields 3927 N of push force at 0.5 MPa, whereas a larger 160 mm bore provides 10053 N for heavier loads.
Remember that the rear adjuster acts strictly as a travel stop and does not hold the load without live air pressure; for true fail-safe load holding, consider the SAIL or BSAI series. Because the usable travel is short at 15 mm, ensure the M27x2 rod thread and carbon steel rod can handle any induced side loads. This cylinder uses the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets.
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 SAIJ125X55-40 FAQ
At 0.5 MPa, this 125 mm bore cylinder provides a push force of 6136 N and a pull force of 5734 N. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw lets you shorten the 55 mm nominal stroke by up to 40 mm, creating a usable travel window of 15 to 55 mm to fine-tune the end position without replacing the cylinder.
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