Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-50 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 SAIJ125X225-50
The AirTAC SAIJ125X225-50 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a usable travel window of 175-225 mm, allowing you to dial back the nominal 225 mm stroke by up to 50 mm without adding external stops. In this bore size, it generates 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
This model features a carbon steel piston rod and a PT tapered port thread. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of position switches. Because the rear adjuster functions strictly as a mechanical stop to set the travel end, it will not hold a load without live air pressure; for true load-holding, consider an external rod lock or the AirTAC SAIL series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-50 |
|---|---|
| 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 SAIJ125X225-50
| 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 SAIJ125X225-50 Is Used
Machine Setup & Changeover
Fine-tune the 225 mm stroke down to 175 mm during line changeovers to accommodate different product sizes without swapping the cylinder.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move and position heavy pallets or fixtures, adjusting the end stop to dial in the exact contact point.
Variable End-Stop Assembly
Use the 50 mm rear adjuster to set precise retraction points in assembly stations where multiple part variants require different clamping depths.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-50 the Right Cylinder?
Choose this 125 mm bore when your application requires substantial thrust, such as the 6136 N available at 0.5 MPa, but you need the flexibility to fine-tune the end position during commissioning or product changeover. If your force requirements are lower, stepping down to a 100 mm bore yields 3927 N of push force at 0.5 MPa, while stepping up to a 160 mm bore provides 10053 N. The adjustable stroke is ideal for variable end stops, whereas a fixed SAI cylinder is preferred for repeatable dedicated strokes.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 225 mm stroke, 50 mm adjustment range, G1/2 port, and your required mounting style. SAIJ supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Since the stroke is 225 mm, ensure adequate side-load support by using an external guide rail to prevent rod binding.
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 SAIJ125X225-50 FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw lets you shorten the effective travel from the nominal 225 mm down to 175 mm. This creates a 175-225 mm adjustable window, allowing you to set the exact end position at commissioning without external stops.
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