Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-50 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 SAIJ40BX260-50
The AirTAC SAIJ40X260-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster that allows you to trim the effective travel back by up to 50 mm. This yields a highly flexible 210 to 260 mm usable travel window, enabling precise end-position tuning at commissioning without swapping out the unit. Operating at 0.5 MPa, it delivers 628 N of push thrust and 528 N of pull thrust.
This variant features a SUS304 stainless steel rod (option B) for superior corrosion resistance and utilizes a PT tapered port thread for a tight, reliable pneumatic connection. The extruded aluminum barrel includes sensor grooves on both sides, ready for DMSE solid-state or CMSE reed switches if required later. It supports the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits the FB, CA, CB, and CR configurations.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-50 |
|---|---|
| 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 SAIJ40BX260-50
| 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 SAIJ40BX260-50 Is Used
Machine Setup & Changeover
Dial in the exact end-position during commissioning or product size changes, trimming the stroke within the 210-260 mm window without adding external physical stops.
Variable End Stops
Perfect for automated lines handling varying package sizes, allowing operators to quickly adjust the retract distance to match the current product dimensions.
Fine-Tuned Positioning
Ideal for assembly stations requiring precise end-of-stroke tuning, where the 50 mm adjustment screw sets the final deceleration point for the moving payload.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-50 the Right Cylinder?
Choose this 40 mm bore when you need more force than the 32 mm variant (402 N push at 0.5 MPa) but want to avoid the bulk of a 50 mm cylinder (982 N push). The 50 mm adjustment range is ideal for product changeovers on a line, letting you dial in a new end-stop on the fly rather than machining external stops. Remember that the rear adjuster acts purely as a travel stop to set the deceleration point; it does not hold the load without live air pressure. For true load-holding without continuous air, consider the SAIL or BSAI series.
When replacing an ISO 15552 cylinder, match the 40 mm bore, 260 mm nominal stroke, PT G1/4 port, and the 50 mm adjustment code. Because the 260 mm stroke is significant, ensure your setup manages side loads—an external guide rail is recommended to prevent rod binding over long unsupported travel.
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 SAIJ40BX260-50 FAQ
At a standard operating pressure of 0.5 MPa, the SAIJ40X260-50 cylinder provides a push force of 628 N and a pull force of 528 N. It can reach a maximum push force of 1130 N at 0.9 MPa.
The rear adjuster screw acts as a mechanical stop that shortens the retract stroke. For this 260 mm stroke model, the -50 code means you can fine-tune the effective travel anywhere between 210 mm and 260 mm without replacing the cylinder.
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