Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-40 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 SAIJ125X225-40
The AirTAC SAIJ125X225-40 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N push force at 0.5MPa and features a 185-225mm adjustable travel window, allowing you to trim the 225mm nominal stroke by up to 40mm during commissioning. This built-in adjustability eliminates the need to swap cylinders or bolt on external stops when fine-tuning end positions.
Engineered for heavy loads, this model uses a 32mm carbon steel rod and a PT G1/2 port. The extruded aluminum barrel incorporates sensor grooves on both sides for flexible switch mounting. If your application requires load-holding without live air pressure, note that the rear adjuster functions strictly as a travel stop and deceleration point, not a lock; you would need to specify an SAIL or BSAI series cylinder for that capability.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-40 |
|---|---|
| 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 SAIJ125X225-40
| 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 SAIJ125X225-40 Is Used
Product Changeovers
Dial in the 185-225mm travel window during format changes on packaging lines, using the rear adjuster to hit exact end positions without swapping hardware.
Heavy Pressing
Leverage the 6136N push force at 0.5MPa for heavy-duty pressing or holding operations where precise final positioning is critical.
Machine Setup
Fine-tune the end-stop during initial commissioning to perfect the mechanical sequence, avoiding the need for external stopper blocks.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-40 the Right Cylinder?
Choose this 125mm bore when you need substantial thrust, such as the 6136N push force at 0.5MPa, stepping up from a 100mm bore that provides 3927N. The adjustable stroke is ideal for product-size changeovers on a line, letting you dial in the exact 185-225mm travel window without mechanical rework. For applications needing less force, a 100mm bore offers a lighter footprint.
When replacing an ISO 15552 cylinder, match the 125mm bore, 225mm stroke, 40mm adjustment range, PT G1/2 port, and mounting style (Basic, FA, LB, TC, FTC, TCM1, or TCM2). This model lacks a magnet, so position sensing requires adding a -S suffix to use CMSE reed or DMSE electronic switches. Because the stroke is 225mm, ensure proper external guiding to prevent excessive side-loading on the rod.
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 SAIJ125X225-40 FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides a push force of 6136N and a pull force of 5734N. At 0.7MPa, the push force increases to 8590N.
The rear adjuster acts as a mechanical stop, allowing you to shorten the 225mm nominal stroke by up to 40mm, creating a usable travel window of 185-225mm. It only sets the travel end and does not lock the load without live air pressure.
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