Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-75 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 SAIJ40BX260-75
The AirTAC SAIJ40X260-75 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 260 mm nominal stroke that can be dialed back by up to 75 mm, creating a precise 185-260 mm usable travel window for exact end-position tuning during commissioning. Delivering 628 N of push force at 0.5 MPa, it handles mid-range actuation with ease.
This variant is configured with a SUS304 stainless steel rod (code B) for superior corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes dual sensor grooves, allowing you to add CMSE reed or DMSE electronic switches if position feedback is needed later. It supports a standard speed range of 30-800 mm/s and relies on adjustable air cushions at both ends to decelerate the load smoothly.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-75 |
|---|---|
| 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 SAIJ40BX260-75
| 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 SAIJ40BX260-75 Is Used
Product Changeovers
Dial in the 185-260 mm travel window on the fly to accommodate different package sizes on a packaging line without changing out hardware.
Machine Setup
Fine-tune the retract end-position during initial commissioning to perfectly seat components, eliminating the need for external mechanical stops.
Variable End Stops
Use the 75 mm rear adjustment screw to set precise multiple end-stops for testing or assembly stations that require varying retraction depths.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-75 the Right Cylinder?
Choose this 40 mm bore when you need more power than a 32 mm cylinder (402 N push at 0.5 MPa) but want to avoid the bulk of a 50 mm model (982 N). The 75 mm adjustment range is ideal for machines that undergo frequent product changeovers, letting you set variable end-stops mechanically without swapping the cylinder or adding external stops. For fixed-position tasks without the need for commissioning tweaks, a standard SAI cylinder is a simpler alternative.
Because the nominal stroke is 260 mm, ensure adequate external guiding to prevent excessive side-loading on the SUS304 rod. Remember that the rear adjuster acts strictly as a travel stop and the air cushions manage deceleration; neither will hold a load in place without live air pressure. If your application requires true load-holding, consider an AirTAC SAIL or BSAI locking cylinder. This SAIJ model uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and is dimensionally interchangeable per ISO 15552.
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 SAIJ40BX260-75 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 allows you to shorten the effective stroke by up to 75 mm, providing a usable travel window of 185 to 260 mm. It acts as a mechanical stop to fine-tune the retract position and does not lock the load without air pressure.
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