Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-30S 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 SAIJ125AX425-30S
The AirTAC SAIJ125X425-30-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 425 mm nominal stroke that can be fine-tuned backward by up to 30 mm, yielding a usable travel window of 395 to 425 mm. This allows precise end-position calibration during commissioning without adding external stops. Equipped with a SUS420J2 stainless steel rod, it handles substantial thrust up to 8590 N at 0.7 MPa.
This unit includes a piston magnet for position sensing via CMSE reed or DMSE solid-state switches. The extruded aluminum barrel incorporates sensor grooves on both sides for flexible switch mounting. Operating at 30-500 mm/s, it uses PT tapered G1/2 ports and offers variable air cushions at both ends to decelerate heavy loads smoothly.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-30S |
|---|---|
| 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 SAIJ125AX425-30S
| 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 SAIJ125AX425-30S Is Used
Product Changeover
Dial in the 395-425 mm stroke window instantly when switching between product sizes on the packaging line.
Machine Setup
Fine-tune the end-of-stroke position during commissioning without fabricating or bolting on external mechanical stops.
Variable End Stops
Adjust the retract distance on the fly to accommodate different pallet widths entering a machining cell.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-30S the Right Cylinder?
Choose this 125 mm bore when your application requires high force, specifically 6136 N push at 0.5 MPa, stepping up from a 100 mm bore that provides 3927 N. The adjustable 395-425 mm travel window is ideal for product size changeovers on a line, letting operators dial in the exact end-stop without swapping cylinders. For fixed travel needs, a standard SAI cylinder suffices, but the SAIJ rear screw mechanism provides superior setup flexibility.
Because the 425 mm stroke creates a long unsupported rod extension, an external guide is recommended to prevent excessive side-loading and premature seal wear. Remember that the rear adjuster and air cushions only set the travel end and decelerate the load; they do not hold position without live air. For load-holding without pressure, consider an AirTAC SAIL or BSAI cylinder. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125AX425-30S FAQ
This 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force at 0.5 MPa. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw lets you shorten the 425 mm nominal stroke by up to 30 mm, providing a usable travel window of 395 to 425 mm. The adjuster acts as a mechanical stop to set the retract position and does not lock the load without live air pressure.
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Standard models usually ship in 3-4 days.
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