Airtac SAIJ40 Adjustable Cylinder SAIJ40BX30-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX30-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 30mm 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
- Stroke30 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX30-20S
The AirTAC SAIJ40X30-20-S is a double-acting, single-rod profile cylinder dimensionally interchangeable per ISO 15552. It features a rear adjusting screw that lets you fine-tune the stroke at commissioning, providing a usable travel window of 10-30mm from its 30mm nominal length. In the 40mm bore class, it delivers 879N of push force at 0.7 MPa and 528N of pull force.
This unit is built with a SUS304 stainless steel rod for superior corrosion resistance and includes a piston magnet (-S) for position sensing. You can mount AirTAC CMSE reed or DMSE electronic solid-state switches in the extruded aluminum barrel sensor grooves. The PT tapered port and integrated air cushions manage end-of-stroke energy safely.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX30-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX30-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 30 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 SAIJ40BX30-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×30 | 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 SAIJ40BX30-20S Is Used
Machine Setup Tuning
Dial in the exact 10-30mm travel distance during initial commissioning to perfectly time the machine cycle without adding external stopper blocks.
Product Changeover
Quickly adjust the end-position on a packaging line when switching to a different product size, saving downtime by using the built-in rear screw.
Fine Positioning Tasks
Achieve precise end-stops for light-duty pressing or indexing applications, relying on the 879N force and the 20mm adjustment range for accuracy.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX30-20S the Right Cylinder?
Choose this 40mm bore adjustable cylinder when you need to dial in a precise end-stop during machine setup or product changeover without swapping the entire unit. If your application requires less force, stepping down to a 32mm bore yields 563N of push at 0.5 MPa; for heavier loads, a 50mm bore provides 1374N at 0.7 MPa. The rear adjuster acts purely as a mechanical travel stop and does not hold the load without live air pressure—use an AirTAC SAIL or BSAI lock cylinder for fail-safe holding. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ40BX30-20S FAQ
The rear adjuster screw lets you shorten the effective travel by up to 20mm, creating a usable stroke window of 10-30mm from the 30mm nominal stroke. This allows fine-tuning of the end position without changing the cylinder.
At 0.7 MPa operating pressure, this double-acting cylinder provides 879N of push force and 528N of pull force. It can deliver up to 1130N of push force at 0.9 MPa.
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