Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 375mm 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
- Stroke375 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-20
The AirTAC SAIJ40X375-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 355 to 375 mm, allowing you to dial back the nominal 375 mm stroke by up to 20 mm. This built-in stopper simplifies commissioning and product changeovers without adding external stops. Delivering 879 N of push force at 0.7 MPa, it handles moderate positioning tasks reliably.
This unit is configured with a SUS304 stainless steel rod for corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. The rear adjuster acts only as a travel stop and works with the variable air cushions to decelerate the load; it does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 375 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 SAIJ40BX375-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×375 | 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 SAIJ40BX375-20 Is Used
Machine Setup & Changeover
Fine-tune the 355-375 mm travel window during line changeovers to accommodate new product lengths without swapping cylinders.
Variable End-Stop Positioning
Dial in the exact retract position for machining or clamping operations where a fixed 375 mm stroke would overtravel.
Product Diverting
Adjust the diverting stroke on the fly to handle varying package sizes on a single conveyor line.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX375-20 the Right Cylinder?
Choose this 40 mm bore when a 32 mm bore (402 N push at 0.5 MPa) is too weak, but a 50 mm bore (982 N at 0.5 MPa) is oversized. The adjustable stroke is ideal for machine setups requiring precise end-position tuning, offering more flexibility than a fixed-stroke SAI cylinder. For this 375 mm stroke, note that long unsupported strokes increase side-load risks; an external guide is recommended to prevent rod binding.
For ISO 15552 replacement matching, specify: 40 mm bore, 375 mm stroke, 20 mm adjustment, PT port thread, and no magnet (-S omitted). The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. If your application requires fail-safe load holding without continuous air pressure, use an external rod lock or pilot-operated check valve, or select the SAIL or BSAI series instead.
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 SAIJ40BX375-20 FAQ
At 0.7 MPa operating pressure, this 40 mm bore cylinder generates 879 N of push force and 528 N of pull force. The maximum operating pressure is 1.0 MPa.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective travel from 375 mm down to 355 mm. This creates a 20 mm adjustable window for fine-tuning the end position at commissioning without replacing the cylinder.
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