Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-40S 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 SAIJ125X225-40S
The AirTAC SAIJ125X225-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa and features a carbon steel piston rod with an M27x2 thread. The integrated -S magnet enables precise position sensing with AirTAC CMSE reed or DMSE solid-state switches.
This specific SKU provides a 225mm nominal stroke with a 40mm adjustment window, allowing you to dial the effective travel down to 185mm. This fine-tuning capability at commissioning eliminates the need to swap cylinders or add external stops during product changeovers. It uses a PT tapered port and offers a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) tailored for adjustable applications.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-40S |
|---|---|
| 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 SAIJ125X225-40S
| 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 SAIJ125X225-40S Is Used
Variable End-Stop Machining
Dial in the exact 185-225mm retract position for machining operations without disassembling the tooling or swapping cylinders.
Product Changeover Setup
Quickly adjust the stroke by up to 40mm on the fly when switching between different product sizes on a high-force assembly line.
Heavy Assembly Pressing
Leverage the 6136N push force to seat heavy components, using the rear stop to guarantee consistent final positioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-40S the Right Cylinder?
Choose this 125mm bore when your application requires heavy thrust beyond the 3927N push force of the 100mm version at 0.5 MPa. The adjustable 185-225mm travel window is ideal for machines processing varying product sizes, letting you set exact retract end-positions without bolting on external stops. If you need to hold a load without live air pressure, note that the rear adjuster acts only as a travel stop, not a lock; you should look at the SAIL or BSAI series instead.
Because this is a 225mm stroke, it is short enough to avoid severe rod sag, but always ensure the M27x2 rod thread handles the side loads properly by guiding the tooling externally. To match this ISO 15552 cylinder exactly, verify your 125mm bore, 225mm stroke, PT port thread, and the required -S magnet for CMSE/DMSE sensors.
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 SAIJ125X225-40S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach up to 11045N push force at 0.9 MPa.
A rear adjusting screw acts as a mechanical stop, allowing you to trim the 225mm nominal stroke back by up to 40mm. This creates a usable travel window of 185-225mm for fine-tuning end positions without replacing the cylinder.
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