Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 475mm 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
- Stroke475 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-40
The AirTAC SAIJ125X475-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 475 mm travel by up to 40 mm. This creates a precise 435-475 mm usable stroke window, allowing you to fine-tune end positions at commissioning without swapping out the cylinder or adding external stops. It delivers robust thrust, generating 6136 N of push force and 5734 N of pull force at 0.5 MPa.
Featuring a 32 mm carbon steel rod and an M27x2 rod thread, this unit is built to handle heavy loads. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement. If position detection is needed later, you can add AirTAC CMSE reed or DMSE electronic solid-state sensors, though a magnet is required for them to function.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 475 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 SAIJ125X475-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×475 | 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 SAIJ125X475-40 Is Used
Variable End-Stop Tuning
Dial in the exact 435-475 mm end position during machine commissioning to accommodate varying product lengths without fabricating new physical stopper blocks.
Heavy-Duty Product Changeover
Rapidly adjust the retract stroke on a packaging line when switching between different pallet or container sizes, leveraging the 6136 N push force for heavy loads.
Long-Stroke Positioning
Utilize the 475 mm travel for large-format material handling, making fine adjustments to the final position via the rear screw rather than reprogramming the entire pneumatic system.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-40 the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (providing 3927 N push at 0.5 MPa) lacks the necessary force, but a 160 mm bore (10053 N push) would be excessive. The adjustable stroke is ideal for product-size changeovers on a line, letting you shift the end-stop dynamically rather than machining new hard stops. Because the stroke is 475 mm, the extended rod is susceptible to side-loading; always use an external guide to prevent premature seal wear.
To match this ISO 15552 interchangeable cylinder, specify a 125 mm bore, 475 mm stroke, 40 mm adjustment range, PT tapered port thread, and your required mounting option. The SAIJ series supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR. Note that the rear adjuster acts only as a travel stop and does not hold the load without live air; for dead-air load holding, consider an AirTAC SAIL or BSAI cylinder.
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 SAIJ125X475-40 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At its maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw allows you to shorten the 475 mm nominal stroke by up to 40 mm, creating a usable travel window of 435-475 mm. This stopper only sets the end position and deceleration; it does not lock the load without continuous air pressure.
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