Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 275mm 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
- Stroke275 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-40S
The AirTAC SAIJ40X275-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 879N of push force at 0.7MPa and features a built-in magnet for position sensing. The integrated SUS304 stainless steel rod provides excellent corrosion resistance for demanding environments. By utilizing the external adjusting screw, you achieve a usable travel window of 235-275mm without altering your mounting footprint.
This adjustable-stroke design allows precise end-position tuning during commissioning or product changeover. The PT tapered port threads match standard pneumatic fittings, while the extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement. You can easily mount AirTAC CMSE reed or DMSE electronic sensors directly into the profile groove.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 275 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 SAIJ40BX275-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | 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 SAIJ40 Adjustable Cylinder SAIJ40BX275-40S Is Used
Machine Changeover
Dial in the 235-275mm travel window during product size changes without swapping out the entire cylinder or adding external stopper blocks.
End-Position Tuning
Fine-tune the retract end position at commissioning to dial out mechanical interference and achieve precise physical placement.
Variable Diverting
Adjust the stroke length on the fly for pneumatic diverters that handle multiple package sizes on a single conveyor line.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-40S the Right Cylinder?
Choose this 40mm bore when an application requires moderate thrust (628N push at 0.5MPa) and on-the-fly stroke trimming. If your setup demands less force, stepping down to a 32mm bore yields 563N at 0.7MPa; for heavier loads, a 63mm bore provides 2182N at 0.7MPa. The 40mm adjustment range is ideal for variable end-stop requirements, whereas a fixed SAI cylinder suits rigid, unchanging travel limits.
Because the nominal stroke is 275mm, ensure adequate external guiding to prevent excessive rod side-loading. Remember that the rear adjuster acts purely as a travel stop, not a locking device; it cannot hold a load without live air pressure. For load-holding requirements, consider an external rod lock or a SAIL cylinder. This SAIJ model uses the standard ISO 15552 mounting interface, supporting Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ40BX275-40S FAQ
At 0.5MPa it provides 628N push and 528N pull force. At 0.7MPa the push force increases to 879N, with a maximum push force of 1130N at 0.9MPa.
The rear adjuster screw allows you to shorten the effective travel by up to 40mm. This creates a usable stroke window of 235-275mm, letting you set the exact retract end position without changing the cylinder.
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