Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 155mm 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
- Stroke155 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-50
The AirTAC SAIJ125X155-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the travel window from 105 to 155 mm. Delivering 6136 N of push force at 0.5 MPa, it is built for heavy-duty positioning. The piston rod is crafted from SUS420J2 stainless steel (code A), offering robust corrosion resistance for demanding environments.
This model omits the FB, CA, CB, and CR mounting options, utilizing a focused ISO 15552 mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2. The rear adjusting screw acts purely as a mechanical stop to dial in the end position during commissioning; it is not a locking device and will not hold a load without live air pressure. For load-holding requirements, an external rod lock or AirTAC SAIL/BSAI series is recommended.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 155 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 SAIJ125AX155-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×155 | 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 SAIJ125AX155-50 Is Used
Variable End-Stop Positioning
Dial in the exact retract distance between 105 and 155 mm during machine setup to accommodate varying workpiece sizes without adding external stopper blocks.
Commissioning Fine-Tuning
Use the rear adjuster to trim the stroke by up to 50 mm, perfect for synchronizing multi-cylinder movements precisely at initial startup.
Heavy-Duty Forming Press
Leverage the 6136 N push force at 0.5 MPa combined with the SUS420J2 stainless steel rod for durable, high-impact stamping and forming tasks.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-50 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (providing 3927 N at 0.5 MPa) lacks the necessary thrust, but a 160 mm bore (delivering 10053 N) would be excessive. The 50 mm adjustment range is ideal for machinery requiring variable end-stops or product-size changeovers without physically swapping the cylinder. Since the usable travel is 105 to 155 mm, the 155 mm nominal stroke falls below the 300 mm threshold, meaning side-load concerns are minimal, though external guides are still recommended for lateral stability. To replace an ISO 15552 cylinder, match the 125 mm bore, 155 mm stroke, 50 mm adjustment, PT tapered port thread, and the appropriate mounting accessory.
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 SAIJ125AX155-50 FAQ
At an operating pressure of 0.5 MPa, the SAIJ125X155-50 generates 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw allows you to shorten the effective stroke by up to 50 mm. This creates a usable travel window of 105 to 155 mm from the 155 mm nominal stroke, enabling fine-tuning of the end position without swapping the cylinder.
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