Airtac SAIJ125 Adjustable Cylinder SAIJ125BX210-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX210-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 210mm 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
- Stroke210 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX210-40
The AirTAC SAIJ125X210-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel by up to 40 mm. This creates a precise 170-210 mm usable window, enabling fine end-position tuning at commissioning without swapping out the physical cylinder. It delivers a robust 6136 N push force at 0.5 MPa, making it suited for heavy-duty positioning tasks.
This specific configuration incorporates a SUS304 stainless steel rod (material code B) for superior corrosion resistance and utilizes PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. While the rear adjuster sets the travel limit and the integrated air cushions handle deceleration, neither component will hold a load without continuous live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX210-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX210-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 210 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 SAIJ125BX210-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×210 | 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 SAIJ125BX210-40 Is Used
Product Changeover
Dial in the 170-210 mm travel window during format changes on a packaging line, using the rear screw to set exact end positions for different carton sizes without changing cylinders.
Heavy Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or chassis components into exact alignment before a secondary machining operation.
Commissioning Fine-Tune
Trim up to 40 mm off the nominal stroke during initial machine setup to perfectly time the kinematics, preventing over-travel without installing external shock absorbers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX210-40 the Right Cylinder?
Choose this 125 mm bore when an 80 mm bore (providing 2513 N push at 0.5 MPa) lacks the thrust for your heavier fixtures, but a 160 mm bore (10053 N) would be excessive. The adjustable 170-210 mm travel window is ideal for production lines running mixed product sizes, allowing operators to dial in the exact end-stop during changeovers instead of adding external mechanical stops. To match this cylinder exactly when replacing an ISO 15552 unit, specify the 125 mm bore, 210 mm stroke, 40 mm adjustment range, PT ports, and SUS304 rod.
Because the nominal stroke is 210 mm, ensure your mounting arrangement adequately supports the load to prevent excessive side-loading on the rod. If your application requires the load to be held mechanically in place during a loss of air pressure, a standard SAIJ is insufficient; you should explore an AirTAC SAIL (pneumatic lock) or BSAI (clamp-lock) cylinder instead. SAIJ supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting 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 SAIJ125BX210-40 FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster acts as a mechanical stop that allows you to shorten the 210 mm nominal stroke by up to 40 mm, providing an effective travel range of 170 to 210 mm. It only sets the end position and does not lock the load without live air pressure.
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