Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-40 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 SAIJ40BX280-40
The AirTAC SAIJ40X280-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel window anywhere between 240 and 280 mm. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it well-suited for medium-duty positioning tasks. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting.
This specific SKU is configured with a SUS304 stainless steel rod for superior corrosion resistance and uses PT tapered port threads. The 16 mm rod diameter and M12x1.25 rod thread provide a robust interface that handles side loads well, though an external guide is still recommended for this 280 mm stroke. The rear adjuster acts purely as a mechanical stop to decelerate the travel end, meaning it will not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-40 |
|---|---|
| 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 SAIJ40BX280-40
| 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 SAIJ40BX280-40 Is Used
Machine Changeover
Dial in the 240-280 mm travel window during product size transitions without physically replacing the cylinder or repositioning hard stops.
Variable End-Stop Diverter
Adjust the retract position on the fly to handle different package sizes on a single conveyor line, using the rear screw to set the exact end point.
Commissioning Fine-Tune
Trim the nominal 280 mm stroke by up to 40 mm during initial setup to perfectly align tooling or clamping faces without machining spacers.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-40 the Right Cylinder?
Choose this 40 mm bore adjustable cylinder when your application requires variable end-stops or frequent machine changeovers, allowing you to dial in the exact 240-280 mm travel without swapping out the entire cylinder or adding external stops. If your setup needs higher clamping force, stepping up to the 50 mm bore yields 982 N of push force at 0.5 MPa. Conversely, lighter duties can be handled by the 32 mm bore, which provides 402 N. Because the stroke is 280 mm, an external guide should be used to prevent excessive rod side-loading. To replace an ISO 15552 cylinder, match the 40 mm bore, 280 mm stroke, 40 mm adjustment, PT G1/4 port, and your required mounting (Basic, FA, LB, TC, FTC, TCM1, or 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 SAIJ40BX280-40 FAQ
The rear adjuster screw lets you shorten the effective stroke by up to 40 mm, providing a usable travel window of 240 to 280 mm. This mechanical stop works with the air cushion to set the end position, but it does not lock or hold the load without continuous air pressure.
At an operating pressure of 0.5 MPa, the SAIJ40X280-40 generates 628 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
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