Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-75S 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 SAIJ40BX270-75S
The AirTAC SAIJ40X270-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 628N of push force and 528N of pull force at 0.5 MPa, utilizing a G1/4 port. The built-in rear stopper allows you to trim the effective travel, creating a usable stroke window of 195-270mm for precise end-position tuning during commissioning.
This variant features a SUS304 stainless steel rod (code B) for superior corrosion resistance and includes a magnet (-S) for use with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel incorporates sensor grooves on both sides, and the unit relies on adjustable air cushions at both ends to decelerate the load smoothly.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-75S |
|---|---|
| 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 SAIJ40BX270-75S
| 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 SAIJ40BX270-75S Is Used
Machine Changeover
Dial in the 195-270mm travel window during product size transitions to set new end positions without physically replacing the cylinder.
Variable End Stops
Ideal for diverter gates on conveyors where the rear stopper fine-tunes the actuation point at commissioning without adding external stops.
Corrosive Setup Tuning
The SUS304 stainless rod supports adjustable end-position tuning in washdown or mildly corrosive manufacturing environments.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-75S the Right Cylinder?
Choose this 40mm bore when an application requires moderate thrust and significant on-the-fly stroke flexibility; the 75mm adjustment window is ideal for product-size changeovers without swapping cylinders. If you need less force, stepping down to a 32mm bore yields 402N push force at 0.5 MPa, while stepping up to a 50mm bore provides 982N. Because the nominal stroke is 270mm, ensure adequate external guiding to prevent excessive rod side-loading. This SAIJ model uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets. The rear adjuster acts strictly as a travel stop and does not hold the load without live air; for true load-holding, consider the SAIL or BSAI series. For an ISO 15552 replacement, match the 40mm bore, 270mm stroke, 75mm adjustment, PT ports, and -S magnet.
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 SAIJ40BX270-75S FAQ
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective travel by up to 75mm. This creates a usable stroke window of 195-270mm, enabling fine-tuning of the end position at commissioning without swapping the cylinder.
At 0.5 MPa operating pressure, the SAIJ40X270-75-S generates 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N.
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