Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-100 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 SAIJ125AX425-100
The AirTAC SAIJ125X425-100 is a double-acting, single-rod ISO 15552 profile cylinder featuring an integrated rear stroke adjuster. It provides a generous 425 mm nominal stroke that can be fine-tuned backward by up to 100 mm, creating a precise 325-425 mm usable travel window. This allows operators to dial in exact retract end-positions during commissioning without swapping out the physical cylinder or adding bulky external stops.
Delivering 8590 N of push force at 0.7 MPa, this 125 mm bore unit handles heavy loads with ease. It is built with a SUS420J2 stainless steel rod for superior corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes dual sensor grooves, and the robust 32 mm rod paired with an M27x2 thread provides excellent resistance to side loading, though long 425 mm strokes still require an external guide rail.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-100 |
|---|---|
| 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 SAIJ125AX425-100
| 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 SAIJ125AX425-100 Is Used
Multi-Format Machining
Dial in the 325-425 mm retract position on the fly to accommodate different workpiece lengths without changing out the cylinder.
Product Diversion
Adjust the stroke stop by up to 100 mm to handle varying package sizes on a sorting line during production changeovers.
Heavy Material Handling
Leverage the 8590 N push force at 0.7 MPa to move heavy pallets or fixtures, fine-tuning the end position to match machine setup.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-100 the Right Cylinder?
Choose this SAIJ125X425-100 model when your machinery requires variable end-stop positioning or frequent product size changeovers. If you need slightly less force, stepping down to a 100 mm bore yields 5497 N at 0.7 MPa, while stepping up to a 160 mm bore provides 14074 N for heavier payloads. The 100 mm adjustment range is ideal for accommodating multiple product formats on a single conveyor line without mechanical rebuilds.
This cylinder uses the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting FB, CA, CB, and CR brackets. Because it lacks a -S magnet, it cannot host CMSE or DMSE sensors. Remember that the rear adjuster acts strictly as a travel stop and does not hold the load without live air; for true pneumatic locking without pressure, consider the SAIL or BSAI series. As a dimensionally interchangeable ISO 15552 cylinder, it drops directly into standard footprints.
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 SAIJ125AX425-100 FAQ
It features a rear adjusting screw that acts as a mechanical stop, allowing you to shorten the effective stroke from 425 mm down to 325 mm. This 100 mm adjustment window is set during commissioning and does not alter the cylinder's standard ISO 15552 mounting dimensions.
At 0.5 MPa, it generates 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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