Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-50 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 SAIJ40BX280-50
The AirTAC SAIJ40X280-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel back by up to 50 mm. This yields a usable end-position window of 230 to 280 mm, letting you dial in the exact retract distance during commissioning without swapping out the barrel or adding external stopper blocks. Built with a SUS304 stainless steel rod and PT tapered port threads, it handles demanding environments while delivering 628 N of push force at 0.5 MPa.
Because this is a profile cylinder with an extruded aluminum barrel, it integrates sensor grooves on both sides for direct mounting of position switches. The rear adjuster acts purely as a mechanical stop for the piston, meaning it sets the travel end but will not hold a load safely without live air pressure; for true fail-safe load holding, consider the SAIL or BSAI series instead.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-50 |
|---|---|
| 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 SAIJ40BX280-50
| 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 SAIJ40BX280-50 Is Used
Machine Changeovers
Fine-tune the 230-280 mm retract distance during product size transitions without disassembling the cylinder or adding external shims.
End-Stop Calibration
Use the 50 mm rear adjustment screw to precisely set the resting position of the tooling during initial commissioning.
Assembly Line Positioning
Provides a variable end-stop for pushing parts into fixtures, allowing quick adaptation to different component widths.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-50 the Right Cylinder?
Choose this 40 mm bore when your application requires the 628 N push force at 0.5 MPa, which sits neatly between the lighter 32 mm bore and the stronger 50 mm bore that outputs 982 N. The adjustable stroke is ideal for machine setups requiring product changeovers, as you can shift the end-stop by up to 50 mm on the fly rather than machining new spacers. Mounting options include the reduced SAIJ set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR styles. Since the 280 mm stroke is relatively long, always support the load with an external guide to prevent excessive side-loading on the rod.
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 SAIJ40BX280-50 FAQ
The rear adjuster screw lets you shorten the nominal 280 mm stroke by up to 50 mm, giving an effective travel range of 230 to 280 mm. It functions as a mechanical stop and does not lock the load without air pressure.
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It can reach up to 1130 N of push force at 0.9 MPa.
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