Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-20 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 SAIJ40BX280-20
The AirTAC SAIJ40X280-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 280 mm travel by up to 20 mm for a precise 260-280 mm usable window. Delivering 879 N of push force at 0.7 MPa, it handles mid-range actuation tasks with ease. The extruded aluminum barrel features sensor grooves on both sides, though this specific configuration omits the magnet.
This variant utilizes a SUS304 stainless steel rod (code B) for superior corrosion resistance and features PT tapered port threads (G1/4). The rear adjustment screw acts purely as a mechanical stop to fine-tune the retract end position during commissioning; it does not lock or hold the load without continuous air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-20 |
|---|---|
| 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 SAIJ40BX280-20
| 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 SAIJ40BX280-20 Is Used
Machine Changeover
Quickly adjust the 260-280 mm travel window when switching product sizes on a packaging line without swapping the cylinder.
End-Position Tuning
Fine-tune the retract stroke during initial commissioning to achieve exact seating without machining external spacers.
Variable Stops
Act as an adjustable end-stop for diverter gates or pushers that require slight positional shifts between batches.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-20 the Right Cylinder?
Choose this 40 mm bore when a 32 mm cylinder (providing 563 N push at 0.7 MPa) lacks thrust, but a 63 mm bore (2182 N) is physically oversized. The 20 mm adjustment window is ideal for product changeovers or dialing in exact end positions without adding external stopper blocks. For load-holding without live air pressure, consider an AirTAC SAIL or BSAI cylinder instead. To match this ISO 15552 replacement exactly, verify the 280 mm stroke, 20 mm adjust code, PT G1/4 port, SUS304 rod, and standard mounting options.
Because the 280 mm stroke is relatively long, the 16 mm rod should be guided externally if the application involves heavy side loads. Available mountings include 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 SAIJ40BX280-20 FAQ
At 0.7 MPa operating pressure, this 40 mm bore cylinder provides 879 N of push force and 528 N of pull force. It can reach a maximum push force of 1130 N at 0.9 MPa.
The rear adjuster screw allows you to shorten the effective stroke by up to 20 mm, providing a usable travel range of 260 to 280 mm. It functions as a mechanical stop and does not hold the load without air pressure.
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