Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-75 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 SAIJ40BX300-75
The AirTAC SAIJ40X300-75 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 628N of push force at 0.5 MPa. It features a SUS304 stainless steel rod and PT tapered ports. By turning the rear stopper screw, you unlock a 225 to 300 mm usable travel window, allowing precise end-position tuning without swapping hardware.
Because the adjuster acts purely as a mechanical stop, it does not hold the load without live air; for position holding you would need a SAIL or BSAI variant. The extruded aluminum barrel includes sensor grooves on both sides, ready for CMSE or DMSE switches if a magnet is added later. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-75 |
|---|---|
| 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 SAIJ40BX300-75
| 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 SAIJ40BX300-75 Is Used
Product Changeover
Quickly dial in the 225 to 300 mm travel window during format changes on packaging lines without replacing the cylinder.
End-Position Tuning
Fine-tune the retract distance during machine commissioning to achieve exact positioning without external stoppers.
Variable Stops
Adjust the stroke on the fly for sorting or diverting items of varying sizes on a conveyor system.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX300-75 the Right Cylinder?
Select this 40mm bore when an application requires moderate thrust (628N push at 0.5 MPa) but demands variable end-stops for product changeovers; if you need less force, a 32mm bore provides 402N, while a 50mm bore steps up to 982N. The 75mm adjustment window lets you dial in the exact retract distance during commissioning, avoiding the need to bolt on external stops or buy a fixed-stroke SAI cylinder.
When matching an ISO 15552 replacement, verify the 300mm stroke, 75mm adjustment range, PT port thread, and SUS304 rod material. Since the stroke is 300mm, the 16mm rod and M12x1.25 thread provide good rigidity, but an external guide is recommended to prevent excessive side-loading on long travels.
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 SAIJ40BX300-75 FAQ
It features a rear mechanical stopper screw that allows you to trim the effective stroke back by up to 75 mm, providing a usable travel window of 225 to 300 mm without changing the cylinder.
At 0.5 MPa operating pressure, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N.
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