Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 300mm 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
- Stroke300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-40
The AirTAC SAIJ40X300-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel back by up to 40 mm. This yields a usable stroke window of 260-300 mm, enabling precise end-position tuning at commissioning without swapping out the unit or adding external stops. Built with a SUS304 stainless steel rod and tapered PT ports, it delivers 628N of push force at 0.5 MPa and 1130N at 0.9 MPa.
The extruded aluminum barrel includes sensor grooves on both sides for straightforward positioning of CMSE reed or DMSE electronic sensors. The rear adjuster acts purely as a mechanical stop to set the travel end and deceleration point alongside the variable air cushions; it does not hold the load without live air pressure. SAIJ mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 300 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 SAIJ40BX300-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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 SAIJ40BX300-40 Is Used
Adjustable Machine Stops
Fine-tune the 260-300 mm travel window during commissioning to set exact retract positions without machining new external stop blocks.
Product Changeover Lines
Quickly adapt the cylinder stroke on the fly when running different package sizes or product lengths through the same machinery.
End-Position Calibration
Dial in the precise end-of-stroke location during setup, letting the rear mechanical stop refine the final position after the air cushion decelerates the load.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-40 the Right Cylinder?
Choose this 40 mm bore adjustable-stroke cylinder when your application requires a 628N push force at 0.5 MPa, which sits neatly between the 402N of a 32 mm bore and the 982N of a 50 mm bore. The 40 mm adjustment range is ideal for product-size changeovers on a line, allowing you to dial in the exact 260-300 mm travel window on the fly rather than machining custom fixed stops or reverting to a standard SAI cylinder.
Because the 300 mm stroke places extended leverage on the 16 mm rod and M12x1.25 thread, an external guide is recommended to prevent excessive side-loading and premature seal wear. To match an ISO 15552 replacement, verify the 40 mm bore, 300 mm stroke, 40 mm adjustment, PT G1/4 ports, and the selected mounting bracket. For load-holding requirements without continuous air pressure, note that this adjuster is strictly a travel stop, not a lock; you should instead specify an SAIL air-released lock, a BSAI clamp-lock, or an external rod lock.
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 SAIJ40BX300-40 FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628N of push force and 528N of pull force. At 0.9 MPa, the push force increases to 1130N.
The rear adjusting screw acts as a mechanical stop that lets you shorten the nominal 300 mm stroke by up to 40 mm, creating a usable travel window of 260-300 mm. It sets the end position but does not lock or hold the load without live air pressure.
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