Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-40 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 SAIJ125X425-40
The AirTAC SAIJ125X425-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136 N of push force at 0.5 MPa. It features a 32 mm carbon steel rod and a PT tapered G1/2 port. By turning the rear screw, you can trim the 425 mm nominal stroke back by up to 40 mm, creating a precise 385 to 425 mm usable travel window for exact end-position tuning.
This adjustable stopper allows you to fine-tune the retract position during commissioning without swapping out the entire cylinder or adding external stops. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets. Operating at 30-500 mm/s, it relies on variable air cushions at both ends to decelerate the load, though neither the cushion nor the adjuster will hold the load without live air.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-40 |
|---|---|
| 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 SAIJ125X425-40
| 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 SAIJ125X425-40 Is Used
Product Changeovers
Dial in the 385-425 mm travel window during format size changes without replacing the cylinder or re-machining fixed external stops.
Heavy Press Fitting
Leverage the 6136 N push force at 0.5 MPa to seat heavy components, using the rear screw to fine-tune the exact bottoming position.
Assembly Line Indexing
Provide accurate end-of-stroke positioning for large pallets, relying on the robust 32 mm carbon steel rod to handle the shifting loads.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-40 the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (providing 3927 N push at 0.5 MPa) lacks the necessary thrust, but a 160 mm bore (10053 N) would be excessive. The 40 mm adjustment range is ideal for product changeovers on a line, letting you dial in the exact end-stop without machining new hard stops. When replacing an ISO 15552 cylinder, match the 425 mm stroke, 40 mm adjuster, PT port thread, and mounting bracket. Because the stroke is 425 mm, the extended 32 mm rod and M27x2 thread still require an external guide to prevent excessive side-loading and premature seal wear. For load-holding without live air pressure, select a SAIL or BSAI cylinder instead, as the SAIJ rear adjuster functions only as a travel stop, not a lock.
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 SAIJ125X425-40 FAQ
The rear adjuster acts as an external stopper that lets you shorten the 425 mm nominal stroke by up to 40 mm. This creates a usable travel window of 385 to 425 mm, allowing you to fine-tune the end position at commissioning without changing the cylinder.
At 0.5 MPa operating pressure, it provides 6136 N of push force and 5734 N of pull force. If you increase the pressure to 0.7 MPa, the push force rises to 8590 N.
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