Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-40 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 SAIJ125AX45-40
The AirTAC SAIJ125X45-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering robust performance for heavy-duty automation. It features a 125 mm bore that generates 6136 N of push force at 0.5 MPa, paired with a 45 mm nominal stroke. The integrated rear stopper screw provides a 40 mm adjustment range, yielding a highly versatile 5-45 mm usable travel window for precise end-position tuning during commissioning.
This specific configuration incorporates a SUS420J2 stainless steel rod (material code A) for superior corrosion resistance and utilizes PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE or DMSE switches. The rear adjuster acts purely as a travel stop to decelerate the load, meaning it will not hold position without continuous live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-40 |
|---|---|
| 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 SAIJ125AX45-40
| 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 SAIJ125AX45-40 Is Used
Precision End-Stop Tuning
Dial in the exact clamping distance on an assembly fixture by adjusting the rear stopper, utilizing the 5-45 mm travel window to accommodate part variations.
Machine Changeover Setup
Rapidly reconfigure end-of-stroke positions for different product sizes running on the same conveyor line without physically swapping out the cylinder.
Heavy-Duty Forming
Leverage the 6136 N push force at 0.5 MPa for pressing or forming operations, using the adjustable stop to limit travel and prevent over-travel damage.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX45-40 the Right Cylinder?
Selecting the SAIJ125X45-40 is ideal when a machine setup requires exact end-position tuning without fabricating external stops. The 40 mm adjustment window on a 45 mm stroke allows you to dial in the exact travel distance during product changeovers. If your application requires less force, stepping down to an 80 mm bore yields 2513 N of push force at 0.5 MPa, whereas moving up to a 160 mm bore provides 10053 N for heavier loads.
For load-holding applications without live air pressure, note that this cylinder's adjuster is a stop, not a lock; you would need to explore the SAIL or BSAI series instead. To ensure seamless ISO 15552 replacement, verify the 125 mm bore, 45 mm stroke, 40 mm adjustment range, PT G1/2 port, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, 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 SAIJ125AX45-40 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At the maximum pressure of 1.0 MPa, it can deliver up to 1251 kgf.
The rear adjuster screw lets you mechanically shorten the 45 mm nominal stroke by up to 40 mm, creating a 5-45 mm usable travel window. This allows you to fine-tune the retract end position at commissioning without adding external stops.
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