Airtac SAIJ125 Adjustable Cylinder SAIJ125X80-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X80-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 80mm 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
- Stroke80 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X80-40S
The AirTAC SAIJ125X80-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136 N of push force at 0.5 MPa and features a built-in magnet for position sensing. The PT tapered ports and carbon steel rod provide robust performance for heavy-duty operations.
With a nominal stroke of 80 mm and a 40 mm adjustment range, this SKU yields a usable travel window of 40 to 80 mm. You can fine-tune the retract end-position at commissioning without swapping the cylinder or adding external stops. The rear adjuster acts purely as a travel stop for deceleration, meaning it will not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X80-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X80-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 80 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 SAIJ125X80-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×80 | 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 SAIJ125X80-40S Is Used
Variable End Stops
Dial in the exact 40-80 mm travel distance during machine setup to accommodate varying material thicknesses without external stopper blocks.
Product Size Changeovers
Quickly adjust the retract position on packaging lines when switching between different container sizes, minimizing downtime between production runs.
Commissioning Fine-Tune
Trim the stroke up to 40 mm during initial commissioning to perfectly align heavy clamping forces with the mechanical fixture.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X80-40S the Right Cylinder?
Select this 125 mm bore when an 80 mm bore (providing 2513 N push at 0.5 MPa) lacks the necessary thrust, but you need precise end-position tuning during product changeovers. The carbon steel rod features an M27x2 thread, offering high tensile strength, though long unsupported strokes still require an external guide. For load-holding without live pressure, consider the SAIL or BSAI series instead of relying on this adjuster.
To replace an ISO 15552 cylinder, match the 125 mm bore, 80 mm stroke, 40 mm adjustment, PT port threads, and the -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. It operates at speeds of 30-500 mm/s and accepts CMSE reed or DMSE electronic sensors in the dual-side barrel grooves.
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 SAIJ125X80-40S FAQ
At 0.5 MPa it provides 6136 N push and 5734 N pull force. If you increase pressure to 0.7 MPa, the push force rises to 8590 N.
The rear adjuster allows you to shorten the effective stroke within a 40 to 80 mm travel window. It functions as a mechanical stop to set the end position, not a lock, and requires live air to hold the load.
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