Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-20 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 SAIJ125AX225-20
The AirTAC SAIJ125X225-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 205 to 225 mm, allowing you to dial back the nominal 225 mm stroke by up to 20 mm during commissioning. This eliminates the need to swap the cylinder or bolt on external stops when fine-tuning end positions. It delivers 6136 N of push force at 0.5 MPa.
This SKU is configured with a SUS420J2 stainless steel rod (material code A) for superior corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, though this specific unit is built without a magnet. The rear adjuster acts purely as a travel stop to set deceleration limits and does not hold the load without live air pressure; for true load-holding, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-20 |
|---|---|
| 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 SAIJ125AX225-20
| 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 SAIJ125AX225-20 Is Used
Machine Changeover
Fine-tune the 205-225 mm retract position during product size transitions without physically replacing the cylinder or adding external stopper blocks.
End-Position Calibration
Dial in the exact end-of-stroke stop during machine commissioning to perfect timing and positioning, absorbing minor mechanical discrepancies.
Variable Diverter Stops
Adjust the travel limit on the fly to handle different package sizes on a packaging line, ensuring precise diverting force with 6136 N at 0.5 MPa.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-20 the Right Cylinder?
Choose this 125 mm bore cylinder when an application requires substantial thrust—6136 N at 0.5 MPa or 11045 N at 0.9 MPa. If your process needs less force, stepping down to a 100 mm bore yields 3927 N at 0.5 MPa, while moving up to a 160 mm bore provides 10053 N. The adjustable stroke is ideal for machine setups requiring variable end-stops or product-size changeovers, offering flexibility a fixed-stroke SAI cylinder cannot match.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 225 mm stroke, 20 mm adjustment, PT G1/2 port, and your required mounting style (Basic, FA, LB, TC, FTC, TCM1, or TCM2). Because the stroke is 225 mm, ensure adequate external guiding to prevent excessive side-loading on the 32 mm rod, especially since the SAIJ mounting set omits the FB, CA, CB, and CR options.
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 SAIJ125AX225-20 FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N. The operational speed range for this bore size is 30-500 mm/s.
The rear adjuster screw lets you shorten the effective travel from the nominal 225 mm down to a minimum of 205 mm, creating a 205-225 mm adjustable window. This stopper sets the travel end and deceleration limit, but it is not a lock—the cylinder will not hold its load without live air pressure.
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