Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 275mm 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
- Stroke275 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-20
The AirTAC SAIJ125X275-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 255 to 275 mm usable travel window, allowing you to dial back the nominal 275 mm stroke by up to 20 mm during commissioning. It delivers 6136 N of push force at 0.5 MPa, scaling up to 11045 N at 0.9 MPa, making it suited for heavy-duty positioning tasks.
This variant uses a SUS420J2 stainless steel rod (code A) for improved corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches, though this specific SKU is built without a magnet. The rear adjuster acts purely as a travel stop to set deceleration, not as a load-holding lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 275 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 SAIJ125AX275-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×275 | 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 SAIJ125AX275-20 Is Used
Machine Changeover
Dial in the 255-275mm travel window during product size transitions without adding external mechanical stops.
Heavy Pressing
Leverage 11045N of push force at 0.9MPa for high-resistance assembly or pressing operations requiring exact endpoints.
Commissioning Calibration
Fine-tune the final retract position by up to 20mm during initial setup to perfect machine timing.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-20 the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial force—delivering 6136 N at 0.5 MPa—along with precise end-position tuning without swapping hardware. If your process needs less force, stepping down to a 100 mm bore yields 3927 N at 0.5 MPa. The adjustable-stroke mechanism is chosen over a fixed SAI cylinder when you need variable end-stops for product changeovers or fine-tuning at setup. Because this is a 275 mm stroke, ensure an external guide supports the load to prevent excessive side-loading on the rod.
To match this ISO 15552 interchangeable cylinder, specify a 125 mm bore, 275 mm stroke, 20 mm adjustment range, PT port threads, and no magnet. The SAIJ series supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Remember that the rear adjuster and air cushions do not hold the load without live air; for true position holding, consider an external rod lock, a pilot-operated check valve, or the SAIL and BSAI cylinder series.
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 SAIJ125AX275-20 FAQ
At 0.5 MPa it provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective travel from 275 mm down to 255 mm. It sets the travel end and decelereration point but does not lock the load without live air pressure.
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