Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-20 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 SAIJ125X475-20
The AirTAC SAIJ125X475-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers a robust 8590N push force at 0.7 MPa and provides a usable travel window of 455 to 475mm, letting you dial in the exact retract position without adding external stops. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting.
Equipped with a 32mm carbon steel rod and a PT G1/2 port, this unit handles heavy loads efficiently. The rear adjuster acts purely as a mechanical stop to set the travel end and relies on the built-in air cushions for deceleration; it does not hold the load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-20 |
|---|---|
| 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 SAIJ125X475-20
| 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 SAIJ125X475-20 Is Used
Heavy Press Tuning
Dial in the exact 455-475mm retract stop during heavy press setup to accommodate varying material thicknesses without changing cylinders.
Changeover Adjustment
Quickly modify the end-stop position on automated assembly lines during product size changeovers to minimize downtime.
Long-Stroke Ejection
Handle heavy part ejection tasks where the 8590N thrust and 475mm travel are required, using the adjuster to fine-tune the ejection point.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X475-20 the Right Cylinder?
Choose this 125mm bore when a 100mm cylinder (providing 5497N push at 0.7 MPa) lacks the necessary thrust, but a 160mm bore is oversized. The 20mm adjustment window is ideal for fine-tuning end positions during machine commissioning or product changeovers, unlike a fixed-stroke SAI cylinder. Because the 475mm stroke is relatively long, an external guide is recommended to prevent excessive side-loading on the rod. This SAIJ model uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets. To match this ISO 15552 replacement, verify the 475mm stroke, 20mm adjustment, PT G1/2 port, and standard carbon steel rod (no -S magnet).
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 SAIJ125X475-20 FAQ
At 0.7 MPa operating pressure, this 125mm bore double-acting cylinder generates 8590N of push force and 5734N of pull force.
The rear adjuster allows you to mechanically shorten the 475mm nominal stroke by up to 20mm, creating a 455-475mm usable travel window to fine-tune the end position without swapping the cylinder.
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