Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-20S 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 SAIJ125AX225-20S
The AirTAC SAIJ125X225-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. It features a SUS420J2 stainless steel rod (code A) and a PT tapered port thread. The built-in magnet enables position detection with CMSE reed or DMSE electronic sensors.
With a 225mm nominal stroke and a 20mm adjustment range, this unit provides a usable travel window of 205-225mm. You can fine-tune the retract end-position at commissioning without swapping the cylinder or adding external stops. The rear adjuster acts strictly as a travel stop to set deceleration, not as a lock to hold the load without live air.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-20S |
|---|---|
| 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 SAIJ125AX225-20S
| 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 SAIJ125AX225-20S Is Used
Product Changeovers
Dial in the 205-225mm travel window during format changes on packaging lines, securing exact end positions without physical hardware alterations.
Machine Setup
Fine-tune the retract stop during initial commissioning to dial out mechanical tolerance and achieve precise positioning before locking down the sequence.
Variable End Stops
Adapt clamping or pressing depths on the fly for mixed-product runs, using the rear screw to trim the stroke exactly where the process demands.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-20S the Right Cylinder?
Choose this 125mm bore when an 80mm cylinder (providing 2513N push at 0.5 MPa) lacks the necessary thrust, but a 160mm bore (10053N) would be excessive. The adjustable 205-225mm window is ideal for machines processing varying product sizes, allowing rapid changeover without hardware swaps. For load-holding without continuous air pressure, integrate an external pilot-operated check valve or select the SAIL or BSAI series instead of relying on the adjuster.
To match this ISO 15552 dimensionally interchangeable cylinder for replacement, confirm the 125mm bore, 225mm stroke, 20mm adjustment, PT port, and the -S magnet. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the stroke exceeds 300mm thresholds in larger setups, always support long strokes with an external guide to manage side-load, though this 225mm stroke is well within standard limits.
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 SAIJ125AX225-20S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach a maximum push force of 11045N at 0.9 MPa.
The rear adjuster allows you to shorten the 225mm nominal stroke by up to 20mm, creating a usable travel window of 205-225mm. It acts as a mechanical stop for end-position tuning and is not a locking device.
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