Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 325mm 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
- Stroke325 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-50
The AirTAC SAIJ125X325-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 275-325 mm usable travel window, letting you dial back the nominal 325 mm stroke by up to 50 mm during commissioning without adding external stops. In the 125 mm bore class, it delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa.
This unit uses a SUS420J2 stainless steel rod (option A) for improved corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides. Note that the rear adjuster acts purely as a travel stop for deceleration; it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 325 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 SAIJ125AX325-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×325 | 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 SAIJ125AX325-50 Is Used
Product Changeover
Dial in the 275-325 mm travel window on packaging lines when switching to a different carton size without swapping the cylinder.
Machine Setup
Fine-tune the retract end-position during initial commissioning to perfect the stopping point of a large forming press.
Variable End Stops
Adjust the stroke on the fly for automated assembly equipment that needs to accommodate varying part lengths.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-50 the Right Cylinder?
Choose this 125 mm bore when 80 mm falls short (80 mm provides 2513 N push at 0.5 MPa) or 160 mm is excessive (160 mm yields 10053 N). The adjustable stroke is ideal for product changeovers where end-position fine-tuning is required, unlike a fixed-stroke SAI cylinder. Because the 325 mm stroke is non-standard and exceeds typical lengths, an external guide is recommended to manage side loads on the unsupported rod.
For ISO 15552 replacement, match the 125 mm bore, 325 mm stroke, 50 mm adjustment, PT port, and standard mounting (Basic, FA, LB, TC, FTC, TCM1, TCM2). This model lacks a magnet, so it does not support CMSE or DMSE sensors. For load-holding without live air, consider the SAIL or BSAI series instead of relying on the adjuster.
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 SAIJ125AX325-50 FAQ
The rear adjusting screw lets you shorten the effective travel by up to 50 mm, creating a 275-325 mm usable window. It acts as a mechanical stop to set the end position and does not lock the load without continuous air pressure.
At 0.5 MPa, the SAIJ125X325-50 provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
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