Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-20S 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 SAIJ125X225-20S
The AirTAC SAIJ125X225-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It features a 125 mm bore generating 6136 N of push force at 0.5 MPa, alongside a built-in magnet for position sensing. The integrated adjusting screw provides a usable travel window of 205 to 225 mm, allowing you to trim the effective stroke by up to 20 mm during machine setup.
This adjustable-stop design eliminates the need to swap cylinders or bolt on external stopper blocks when fine-tuning end positions. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of CMSE reed or DMSE electronic switches. It carries a PT tapered port thread, a 32 mm carbon steel piston rod, and adjustable air cushions at both ends to decelerate heavy loads smoothly.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-20S |
|---|---|
| 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 SAIJ125X225-20S
| 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 SAIJ125X225-20S Is Used
Product Size Changeovers
Dial in the 205-225 mm stroke window on the fly when adapting a packaging line to a new carton format, avoiding mechanical teardown.
Machine Setup Tuning
Fine-tune the exact end-of-travel position during commissioning to perfect a pressing or lifting operation without adding external stoppers.
Heavy Load Positioning
Leverage the 6136 N push force to shift heavy pallets or workpieces, relying on the 32 mm rod and air cushions for stable deceleration.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-20S the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder (providing 2513 N push at 0.5 MPa) lacks the thrust for moving substantial masses, but a 160 mm bore (10053 N) would be excessive. The adjustable stroke is specifically valuable for product changeovers, letting you dial in a 205 to 225 mm end position without machining new hard stops. Because the rear adjuster acts only as a travel stop and the cushions handle deceleration, neither will hold a load without live air; for true load-holding, select an SAIL or BSAI cylinder. To match this ISO 15552 replacement exactly, confirm the 225 mm stroke, 20 mm adjustment, PT port, and the required -S magnet.
With a 225 mm stroke, the 32 mm carbon steel rod handles high axial stress, but any long unsupported travel still requires an external guide to prevent binding. Note that SAIJ supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR brackets. Operating speed for this bore is 30-500 mm/s.
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 SAIJ125X225-20S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjusting screw acts as an external stopper that lets you shorten the 225 mm nominal stroke by up to 20 mm, providing a usable travel window of 205 to 225 mm. It sets the end position but does not lock the load without continuous air pressure.
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