Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 260mm 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
- Stroke260 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-20S
The AirTAC SAIJ40X260-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, letting you dial back the nominal 260 mm travel by up to 20 mm for a precise 240-260 mm usable window. It pushes with 628 N and pulls with 528 N at 0.5 MPa, making it a solid mid-range choice for general automation.
This SKU ships with a SUS304 stainless steel rod for corrosion resistance and includes a magnet for position sensing. It accepts AirTAC CMSE reed and DMSE solid-state switches in the dual-side sensor grooves. The PT tapered port is G1/4, and the integrated air cushions decelerate the load at both ends, though the external stopper only sets the travel limit and does not hold the load without live air.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 260 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 SAIJ40BX260-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×260 | 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 SAIJ40BX260-20S Is Used
Changeover Calibration
Dial in the 240-260 mm end position during product size changes without machining new hard stops or replacing the cylinder.
Variable End Stops
Fine-tune the retract distance on a packaging line to accommodate different carton lengths on the fly.
Assembly Pressing
Set precise pressing depths for bearing insertion, leveraging the 628 N push force at 0.5 MPa with repeatable accuracy.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-20S the Right Cylinder?
Choose this 40 mm bore when a 32 mm bore (402 N push at 0.5 MPa) is too weak, but a 50 mm bore (982 N push at 0.5 MPa) would overcomplicate the machine. The adjustable stroke is ideal for product changeovers where the exact end-of-stroke varies slightly, saving you from swapping a fixed-stroke SAI cylinder or adding external stops. For a drop-in ISO 15552 replacement, match the 40 mm bore, 260 mm stroke, 20 mm adjust, G1/4 PT port, and the -S magnet requirement.
At 260 mm, the stroke is within standard limits but still requires attention to side loads. The 16 mm rod and M12x1.25 thread handle moderate bending stress, yet an external guide rail is recommended if the load is heavy or unsupported. Remember that the rear adjuster is a travel stop, not a lock; for true position holding without live air, look at the SAIL or BSAI series.
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 SAIJ40BX260-20S FAQ
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 deliver up to 1130 N push at 0.9 MPa.
A rear adjuster screw acts as a mechanical stop, allowing you to shorten the 260 mm nominal stroke by up to 20 mm, creating a usable 240-260 mm travel window. It only limits the end position and does not lock the load without air pressure.
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