Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 270mm 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
- Stroke270 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-75
The AirTAC SAIJ125X270-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the retract end-position. With a nominal 270 mm stroke and a 75 mm adjustment range, it provides a usable travel window of 195-270 mm to accommodate product changeovers without swapping hardware.
Delivering 6136 N of push force at 0.5 MPa, this bore size is built for heavy loads. It features a SUS420J2 stainless steel rod for enhanced corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, ready for CMSE or DMSE switches if a magnet is added later.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 270 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 SAIJ125AX270-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×270 | 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 SAIJ125AX270-75 Is Used
Product Size Changeovers
Quickly adapt machinery for different product lengths by dialing the stroke back within the 195-270 mm window during line changeovers.
End-Position Tuning
Fine-tune the retract position at machine commissioning to achieve precise mechanical alignment without fabricating external shims.
Heavy Forming Operations
Leverage the 6136 N push force at 0.5 MPa for pressing or heavy-duty handling tasks that require variable end-stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX270-75 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N push at 0.5 MPa) lacks the necessary thrust, but a 160 mm bore is physically oversized. The 75 mm adjustment screw lets you dial in the exact end-stop at commissioning, which is far more efficient than machining external stopper blocks or ordering multiple fixed-stroke SAI cylinders. Because the stroke is 270 mm, ensure adequate external guiding to prevent excessive side-loading on the rod.
For an exact ISO 15552 replacement, match the 125 mm bore, 270 mm stroke, 75 mm adjustment, PT port thread, and your required mounting accessory. The SAIJ series supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, but omits FB, CA, CB, and CR brackets. Remember that the rear adjuster is a travel stop, not a locking device; it will not hold the load without live air pressure, so consider a SAIL or BSAI cylinder if true load-holding is required.
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 SAIJ125AX270-75 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 1251 kgf of push force.
The rear adjuster acts as a mechanical stop that shortens the effective travel. For this 270 mm stroke model, the 75 mm adjustment screw allows you to set the actual retract distance anywhere within a 195 to 270 mm window. It only sets the travel end and does not lock the load without air pressure.
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