Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-100 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 425mm 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
- Stroke425 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-100
The AirTAC SAIJ125X425-100 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 425 mm stroke that can be dialed back by up to 100 mm, giving you a precise 325-425 mm usable travel window for product changeovers. In the 125 mm bore class, it outputs 6136 N of push force and 5734 N of pull force at 0.5 MPa.
The extruded aluminum barrel includes sensor grooves on both sides for CMSE reed and DMSE electronic switches. The carbon steel rod with an M27x2 thread handles high side loads, while the rear stopper allows fine end-position tuning at commissioning without swapping the cylinder or adding external stops.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-100 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 425 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 SAIJ125X425-100
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×425 | 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 SAIJ125X425-100 Is Used
Packaging Line Changeover
Dial the stroke from 425 mm back to 325 mm in seconds to accommodate different carton sizes without disassembling the actuator assembly.
Machine Setup Tuning
Fine-tune the retract end position during commissioning to perfect the seating force of large components without machining external spacers.
Variable End-Stop Forming
Adjust the travel window on heavy presses to cycle between distinct material lengths, leveraging 6136 N of thrust at 0.5 MPa.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-100 the Right Cylinder?
Choose this 125 mm bore when you need more force than the 100 mm class (3927 N push at 0.5 MPa) but less than the heavy 160 mm class (10053 N). The adjustable 325-425 mm travel window is ideal for variable end stops on packaging lines, whereas a fixed-stroke SAI requires physical shims for changeovers. For a drop-in ISO 15552 replacement, match the 425 mm stroke, 100 mm adjustment, PT tapered port thread, and mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2).
Because the 425 mm stroke is long, the M27x2 rod needs external guidance to prevent binding. Note that the rear adjuster is a travel stop, not a lock; the SAIJ does not hold loads without live air. For dead-stop holding, use an external rod lock or pilot-operated check valve.
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 SAIJ125X425-100 FAQ
At 0.5 MPa it provides 6136 N push and 5734 N pull force. The operating speed range for this 125 mm bore is 30-500 mm/s.
A rear screw stopper lets you shorten the effective travel from the nominal 425 mm down to a minimum of 325 mm. The adjuster acts as a mechanical stop to set the end position and does not lock the load without live air pressure.
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