Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-20S 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 SAIJ40BX275-20S
The AirTAC SAIJ40X275-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 255 to 275 mm, enabling precise end-position tuning without swapping out the unit. The 40 mm bore generates 879 N of push force at 0.7 MPa, making it well-suited for moderate-duty positioning tasks.
This variant includes a SUS304 stainless steel piston rod for superior corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel integrates dual-sided sensor grooves, and because this unit carries the -S magnet option, it is fully compatible with AirTAC CMSE reed and DMSE electronic solid-state switches for exact position verification.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-20S |
|---|---|
| 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 SAIJ40BX275-20S
| 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 SAIJ40BX275-20S Is Used
Machine Changeover
Dial in the retract stop from 255 to 275 mm during format changes, allowing quick adaptation to varying product sizes on the same line.
End-Position Tuning
Fine-tune the final resting position at commissioning without physically swapping the cylinder or adding bulky external stopper blocks.
Assembly Station Positioning
Utilize the 879 N push force and SUS304 rod to push parts into a fixture, adjusting the stroke slightly to compensate for tooling wear.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-20S the Right Cylinder?
Select this 40 mm bore adjustable-stroke cylinder when an application demands fine-tuning of the retract end during commissioning or product changeover, avoiding the need to bolt on external stops. If your process requires less force, stepping down to a 32 mm bore yields 563 N at 0.7 MPa, while moving up to a 50 mm bore provides 1374 N for heavier payloads. Keep in mind the rear adjuster functions strictly as a travel stop and does not hold the load without live air; for true pneumatic locking, consider the SAIL or BSAI series.
When matching this cylinder to an ISO 15552 footprint, verify the 275 mm stroke, 20 mm adjustment range, PT port threads, and the -S magnet. The 275 mm stroke length is standard for this bore, but with an unsupported load of this travel distance, an external guide is recommended to prevent rod side-loading. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, deliberately omitting FB, CA, CB, and CR configurations.
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 SAIJ40BX275-20S FAQ
At a 0.7 MPa operating pressure, the 40 mm bore generates 879 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
The rear adjuster acts as an external stopper that lets you shorten the effective stroke by up to 20 mm. This creates a usable travel window between 255 and 275 mm, allowing you to trim the retract position without replacing the cylinder.
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