Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-20 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 SAIJ40BX260-20
The AirTAC SAIJ40X260-20 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 260 mm nominal stroke that can be fine-tuned down by up to 20 mm, giving you a precise 240-260 mm usable travel window during commissioning. Delivering 628 N of push force at 0.5 MPa, it handles mid-range actuation with ease.
This variant is equipped with a SUS304 stainless steel rod for superior corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, allowing you to directly mount CMSE reed or DMSE electronic switches if a magnet is specified later.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-20 |
|---|---|
| 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 SAIJ40BX260-20
| 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 SAIJ40BX260-20 Is Used
Machine Changeover
Dial in the 240-260 mm travel window during product size changes without physically swapping cylinders or repositioning hard stops.
End-Position Tuning
Fine-tune the retract stroke end to perfect a pressing or clamping operation at commissioning using the rear adjustment screw.
Variable Stops
Adjust the effective stroke on a diverter or sorting mechanism to handle different package lengths on the fly.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-20 the Right Cylinder?
Choose this 40 mm bore when a 32 mm bore (402 N push at 0.5 MPa) lacks thrust, but a 50 mm bore (982 N push) is excessive. The 20 mm rear adjuster is ideal for product changeovers, letting you dial in the end position without adding external stops or swapping a fixed-stroke SAI cylinder. Note that the rear adjuster acts only as a travel stop and does not hold the load without live air; for dead-air load holding, consider an external rod lock or the SAIL series.
For an exact ISO 15552 replacement, match the 40 mm bore, 260 mm stroke, 20 mm adjustment, PT G1/4 port, and your required mounting bracket from the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the 260 mm stroke is relatively long, ensure adequate external guidance to prevent excessive side-loading on the 16 mm 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 SAIJ40BX260-20 FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 260 mm nominal stroke by up to 20 mm, creating a 240-260 mm usable travel window. It sets the end position but does not lock the load without live air pressure.
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