Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 145mm 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
- Stroke145 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-20S
The AirTAC SAIJ125X145-20-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 125 to 145 mm, allowing you to dial back the nominal 145 mm stroke by up to 20 mm during commissioning. This bore size delivers 6136 N of push force at 0.5 MPa, making it well-suited for heavy-duty actuation.
The piston rod utilizes SUS420J2 stainless steel for enhanced corrosion resistance, and the integrated magnet (-S) supports position sensing with AirTAC CMSE reed and DMSE electronic switches. The extruded aluminum barrel includes sensor grooves on both sides. The rear adjuster acts purely as a mechanical stop to fine-tune the retract position and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 145 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 SAIJ125AX145-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×145 | 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 SAIJ125AX145-20S Is Used
Product Changeover
Dial in the exact retract distance within the 125-145 mm window when switching between product sizes on a packaging line, avoiding physical hardware swaps.
End-Position Tuning
Fine-tune the final resting position during machine commissioning to align heavy 6136 N loads perfectly without adding external stopper blocks.
Heavy Assembly Press
Leverage the 125 mm bore thrust for pressing components, using the rear stopper to safely limit the travel distance and prevent over-travel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-20S the Right Cylinder?
Choose this 125 mm bore cylinder when an 80 mm bore (providing 2513 N push force at 0.5 MPa) is insufficient for your load, but you want to avoid the mass of a 160 mm body. The adjustable 125-145 mm stroke is ideal for machinery requiring exact end-position tuning or frequent product changeovers without swapping cylinders. Because the nominal stroke is under 300 mm, side-load risks are moderate, but an external guide is still recommended for heavy lateral loads.
This adjustable-stroke design offers distinct advantages over a fixed-stroke SAI cylinder by eliminating the need for external stopper blocks. For load-holding applications without continuous air pressure, consider the SAIL pneumatic lock or BSAI clamp-lock series instead, as the SAIJ adjuster is not a brake. To match this ISO 15552 footprint, verify the 125 mm bore, 145 mm stroke, PT tapered port threads, and the -S magnet requirement.
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 SAIJ125AX145-20S FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can reach up to 8590 N push force at 0.7 MPa.
The rear adjuster acts as a mechanical stop that lets you shorten the effective travel from 145 mm down to 125 mm. It allows precise end-position tuning at commissioning but does not lock the load without live air pressure.
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