Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 550mm 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
- Stroke550 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-20
The AirTAC SAIJ125X550-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling you to dial back the retract position by up to 20 mm. This yields a usable travel window of 530 to 550 mm, which is ideal for fine-tuning end-of-stroke positioning during machine commissioning or product changeovers without swapping hardware. It features a robust 32 mm carbon steel piston rod and a PT tapered G1/2 port.
Delivering 2182 N of pull force at 0.7 MPa, this 125 mm bore profile cylinder integrates adjustable air cushions at both ends to manage kinetic energy. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of CMSE reed or DMSE electronic switches. The rear adjuster acts purely as a mechanical stop for position tuning and does not hold the load without live air pressure; for true load-holding, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 550 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 SAIJ125X550-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×550 | 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 SAIJ125X550-20 Is Used
Changeover Calibration
Dial in the exact retract stop within the 530-550 mm window when switching product sizes on a packaging line, avoiding the need to physically swap cylinders.
End-Position Tuning
Fine-tune the final resting position of a heavy press fixture during machine commissioning, compensating for mechanical tolerances without adding external stops.
Variable Stroke Ejection
Adjust the retract distance of an ejection arm on the fly to accommodate different workpiece widths without reprogramming the machine controller.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-20 the Right Cylinder?
Selecting this model means you require a 125 mm bore that generates 1559 N pull at 0.5 MPa, stepping up from a 100 mm bore that offers 879 N at the same pressure. The adjustable 530-550 mm travel window allows precise variable end-stops on the fly, unlike a fixed-stroke SAI cylinder. For replacement, verify the 550 mm stroke, 20 mm adjustment range, G1/2 PT port, and standard carbon steel rod.
Because the 550 mm stroke is substantial, the 32 mm rod carries significant side-load capacity but an external guide is still recommended to prevent binding. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets. Operating speed is 30-500 mm/s.
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 SAIJ125X550-20 FAQ
At 0.5 MPa it provides 6136 N push and 5734 N pull. At 0.7 MPa, the push force is 8590 N and the pull force is 2182 N.
The rear adjuster screw mechanically limits the retract travel, allowing you to shorten the effective stroke from 550 mm down to 530 mm. It functions as a travel stop and does not lock the load without live air pressure.
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