Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-100S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-100S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 280mm 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
- Stroke280 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-100S
The AirTAC SAIJ40X280-100-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 879 Newtons of push force at 0.7 MPa and features a 280 mm nominal stroke that can be fine-tuned backward by up to 100 mm, creating a precise 180-280 mm usable travel window. This adjustability allows operators to dial in exact end positions during commissioning without swapping out the entire cylinder.
This variant includes a SUS304 stainless steel rod for superior corrosion resistance and a built-in magnet (-S) for use with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel houses sensor grooves on both sides, and the rear adjuster functions strictly as a travel stop to set deceleration, not as a lock to hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-100S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-100S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 280 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 SAIJ40BX280-100S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×280 | 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 SAIJ40BX280-100S Is Used
Product Changeover
Quickly reconfigure the 180-280 mm travel window on packaging lines when switching to different carton sizes, eliminating the need for mechanical spacer changes.
End-Stop Calibration
Fine-tune the retract position during machine commissioning to achieve exact placement, preventing crashes without altering the fixed cylinder mounting.
Variable Diverter
Adjust the stroke on a sorting diverter arm to accommodate varying product widths on the fly, ensuring accurate routing without reprogramming.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-100S the Right Cylinder?
Choose this 40 mm bore when an application requires moderate thrust, such as the 628 Newtons push force at 0.5 MPa, but does not need the higher capacity of a 50 mm bore (982N at 0.5 MPa). An adjustable stroke is highly beneficial for machines that undergo frequent product changeovers, allowing the end-stop to be reconfigured on the fly rather than adding external stops or reverting to a fixed-stroke SAI cylinder. Because the nominal stroke is 280 mm, an external guide should be considered to prevent excessive side-loading on the rod.
To match this ISO 15552 dimensionally interchangeable cylinder, confirm the 40 mm bore, 280 mm stroke, 100 mm adjustment range, PT tapered port threads, and the -S magnet option. If the machine requires true load-holding without continuous air pressure, a plain SAIJ is insufficient; consider the SAIL pneumatic lock or BSAI clamp-lock series instead. Mounting choices span Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ40BX280-100S FAQ
At 0.5 MPa it provides 628N push and 528N pull force. At 0.7 MPa the push force is 879N, and it reaches a maximum push force of 1130N at 0.9 MPa.
The rear adjusting screw acts as a stopper that lets you shorten the effective stroke by up to 100 mm, providing a usable travel window of 180 to 280 mm. It sets the travel end and deceleration but does not lock the load without live air pressure.
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