Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 45mm 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
- Stroke45 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-20
The AirTAC SAIJ125X45-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 25 to 45 mm, allowing you to dial back the nominal 45 mm stroke by up to 20 mm during commissioning. Delivering 6136 N of push force at 0.5 MPa, it handles heavy positioning tasks with ease.
This model features a SUS420J2 stainless steel rod and PT tapered ports. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 45 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 SAIJ125AX45-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×45 | 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 SAIJ125AX45-20 Is Used
Machine Changeovers
Fine-tune the 25 to 45 mm travel window during product size changes without physically replacing the cylinder or adding external stopper blocks.
Heavy Assembly Presses
Leverage the 6136 N push force at 0.5 MPa for heavy-duty pressing, using the rear adjuster to precisely set the final contact position.
End-Position Tuning
Dial in the exact retracted end-stop during machine commissioning to compensate for mechanical tolerances and ensure repeatable positioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-20 the Right Cylinder?
Choose this 125 mm bore when you need higher force than the 80 mm bore (which provides 2513 N push at 0.5 MPa) but want to avoid the size and air consumption of the 160 mm bore. The 20 mm adjustment range is perfect for product changeovers, allowing you to fine-tune the end position without swapping the cylinder or adding external stops. For true load-holding without live air, consider the SAIL or BSAI series instead.
To match this ISO 15552 interchangeable cylinder, confirm the 125 mm bore, 45 mm stroke, 20 mm adjustment, PT port thread, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Since the adjuster only sets the travel end, use an external guide for heavy lateral loads.
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 SAIJ125AX45-20 FAQ
The nominal 45 mm stroke can be adjusted backward by up to 20 mm via a rear screw stopper, creating a usable travel window of 25 to 45 mm. This allows you to fine-tune the end position without changing the cylinder.
At 0.5 MPa operating pressure, it provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
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