Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 185mm 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
- Stroke185 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-40S
The AirTAC SAIJ125X185-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a usable travel window of 145 to 185 mm. It incorporates a SUS420J2 stainless steel rod and a PT tapered port thread. Equipped with a magnet, it integrates seamlessly with CMSE reed and DMSE solid-state sensors mounted in the dual-side extruded aluminum barrel grooves.
Delivering 6136 N of push force at 0.5 MPa and 8590 N at 0.7 MPa, this unit is built for heavy-duty cycling. The rear stopper allows precise end-position tuning during commissioning without adding external stops. It uses the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting FB and rear pivot options.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 185 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 SAIJ125AX185-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×185 | 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 SAIJ125AX185-40S Is Used
Product Changeover
Dial in the 145-185 mm travel window during line format changes without physically swapping the cylinder or adding external mechanical stops.
End-Position Tuning
Fine-tune the retract stroke end during machine commissioning to perfectly time the 6136 N clamping or pressing force.
Heavy Assembly Pressing
Leverage the 8590 N thrust at 0.7 MPa for heavy-duty assembly tasks while using the rear adjuster to prevent over-travel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-40S the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N push at 0.5 MPa) lacks the necessary thrust, but a 160 mm bore is physically too large. The 40 mm adjustment range is ideal for product changeovers that require slightly different end-stops, functioning as a travel stop rather than a load-holding lock; for pneumatic locking without live air pressure, consider the SAIL or BSAI series. To match this ISO 15552 footprint exactly, specify the 125 mm bore, 185 mm stroke, PT ports, and the -S magnet.
Because the 185 mm stroke exceeds the 300 mm threshold, side-load is minimal, but always ensure the M27x2 rod thread and 32 mm rod diameter are properly supported by an external guide to prevent premature seal wear.
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 SAIJ125AX185-40S 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 0.7 MPa, the push force increases to 8590 N.
The rear adjuster acts as a mechanical stop that allows you to shorten the effective stroke from 185 mm down to 145 mm. It only sets the travel end and does not lock the load without live air pressure.
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