Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 225mm 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
- Stroke225 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-40S
The AirTAC SAIJ125X225-40-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a robust 6136N push force at 0.5 MPa and incorporates a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance. The built-in -S magnet works seamlessly with AirTAC CMSE reed and DMSE electronic sensors fitted into the dual-side barrel grooves.
Equipped with a 40mm adjustment range, this model allows you to fine-tune the effective travel window down from the 225mm nominal stroke to a minimum of 185mm. This rear stopper mechanism enables precise end-position tuning at commissioning without adding external stops. The adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 225 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 SAIJ125AX225-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×225 | 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 SAIJ125AX225-40S Is Used
Variable End-Stop Forming
Dial in the exact 185-225mm travel window for pressing operations, allowing rapid changes to product dimensions without external stop hardware.
Machine Setup Changeover
Quickly fine-tune the rear end position during line changeovers to accommodate different package sizes or material feeds.
Heavy-Duty Positioning
Leverage the 6136N push force to move heavy pallets or components into place, adjusting the stroke on the fly to suit varying load sizes.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-40S the Right Cylinder?
Choose this 125mm bore cylinder when an application requires heavy thrust (6136N at 0.5 MPa) alongside variable end-stop positioning. If your force requirements are lower, stepping down to the 100mm bore yields 3927N push force at 0.5 MPa. The adjustable stroke is ideal for machine setups requiring product-size changeovers, providing a clear advantage over a fixed-stroke SAI cylinder. For load-holding without live air, consider the SAIL or BSAI series instead, as this adjuster is not a lock.
When replacing an ISO 15552 cylinder, match the 125mm bore, 225mm stroke, 40mm adjustment, PT tapered port threads, and the -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR. The 225mm stroke is below the 1500mm maximum standard stroke limit, though the 32mm rod diameter handles high side loads well.
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 SAIJ125AX225-40S FAQ
At 0.5 MPa, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw allows you to shorten the 225mm nominal stroke by up to 40mm, creating an adjustable travel window between 185mm and 225mm. It functions as a mechanical stop and does not lock the load without air pressure.
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