Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 270mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke270 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-20S
The AirTAC SAIJ40X270-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel window down to 250 mm from the 270 mm nominal stroke. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance and features a PT tapered port thread. This -S variant includes a magnet for position sensing.
Because the adjuster acts purely as a mechanical stop at the retract end, it decelerates the travel without locking the load. Live air pressure is still required to hold position, so for dead-load holding you would need a SAIL locking cylinder or an external rod lock. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting interface omits FB, CA, CB, and CR options, utilizing only Basic, FA, LB, TC, FTC, TCM1, and TCM2 hardware.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 270 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max stroke | Up to 1200 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | 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 SAIJ40 Adjustable Cylinder SAIJ40BX270-20S Is Used
Machine Changeover
Dial in the retract end position by up to 20 mm during product size transitions without replacing the cylinder or adding external shims.
End-Stop Tuning
Fine-tune the 250-270 mm travel window during commissioning to perfectly time the mechanical sequence of your assembly line.
Diversion Gates
Adjust the stroke on the fly to accommodate varying package sizes on a conveyor system, ensuring precise routing without retooling.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-20S the Right Cylinder?
Choose this 40 mm bore when an application requires less thrust than the 50 mm bore (982 N push at 0.5 MPa) but more than a 32 mm bore (402 N). The 20 mm adjustment range is perfect for machine changeovers where you need to dial in the exact end position without swapping out the physical cylinder or adding external stops. For a fixed end-stop without the tuning capability, the standard SAI cylinder is the alternative.
When replacing an ISO 15552 cylinder, match the 40 mm bore, 270 mm stroke, 20 mm adjustment, PT port thread, and the -S magnet requirement. Since the 270 mm stroke is 300 mm or longer, the 16 mm diameter rod and M12x1.25 thread will carry moderate side loads, but an external guide rail is recommended for heavy unsupported loads. The -S magnet works precisely with AirTAC CMSE reed and DMSE electronic 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 SAIJ40 Adjustable Cylinder SAIJ40BX270-20S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 128 kgf.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the 270 mm nominal stroke by up to 20 mm, creating a usable travel window of 250-270 mm. It decelerates the end position but does not lock the load without live air pressure.
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