Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-50S 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 SAIJ40BX260-50S
The AirTAC SAIJ40X260-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 260 mm stroke that can be fine-tuned backward by up to 50 mm, creating a usable travel window of 210-260 mm to dial in exact end positions during commissioning. Delivering 628 N of push force at 0.5 MPa, it features a SUS304 stainless steel rod for superior corrosion resistance and a built-in magnet for position sensing.
This model utilizes a G1/4 port and adjustable air cushions at both ends to decelerate the load smoothly. The rear adjuster acts strictly as a travel stop and does not hold the load without continuous air pressure. For load-holding requirements without live air, an external rod lock or pilot-operated check valve is necessary. Sensor grooves on both sides of the extruded aluminum barrel allow direct mounting of CMSE reed or DMSE electronic switches.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-50S |
|---|---|
| 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 SAIJ40BX260-50S
| 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 SAIJ40BX260-50S Is Used
Product Changeover
Quickly adjust the end-of-stroke position by up to 50 mm when switching between product sizes on a packaging line, avoiding physical cylinder swaps.
Machine Setup
Fine-tune the 260 mm travel window during initial commissioning to achieve exact mechanical alignment without adding external shims or stopper blocks.
Variable End Stops
Provide a customizable physical stop for diverter arms or pushers operating within the 210-260 mm range, ensuring precise material placement.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-50S the Right Cylinder?
Choose this 40 mm bore when an application requires precise positioning within a 210-260 mm travel range, stepping up from a 32 mm bore that only yields 402 N of push force at 0.5 MPa. The adjustable stroke is ideal for product changeovers on a line, allowing operators to set variable end stops without swapping the entire cylinder or adding external mechanical stops. If your process demands fail-safe load holding, consider the SAIL or BSAI series instead, as the SAIJ adjuster is not a locking mechanism.
When replacing an ISO 15552 cylinder, match the 40 mm bore, 260 mm nominal stroke, 50 mm adjustment range, PT tapered port thread, and the -S magnet option. Because the 260 mm stroke is relatively long, ensure adequate external guiding to prevent excessive side-loading on the SUS304 rod. This SAIJ variant supports a mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR configurations.
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 SAIJ40BX260-50S FAQ
At a standard operating pressure of 0.5 MPa, this 40 mm bore cylinder generates 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 allows you to shorten the effective travel from the nominal 260 mm down to 210 mm, providing a 50 mm tuning window. It functions as a mechanical stop to set the end position and is not a lock.
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