Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-100
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-100 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 650mm 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
- Stroke650 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-100
The AirTAC SAIJ40X650-100 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 550 to 650 mm usable travel window. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement.
This model uses a PT tapered G1/4 port and relies on a 30 mm air cushion at both ends to decelerate the load. The rear stopper screw allows you to trim up to 100 mm of the nominal stroke during commissioning, eliminating the need to bolt on external physical stops when product sizes change.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-100 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-100 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 650 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 SAIJ40BX650-100
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×650 | 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 SAIJ40BX650-100 Is Used
Variable End-Stop Positioning
Dial in the exact retract distance from 550 to 650 mm during machine setup to accommodate different material lengths without adding external stopper blocks.
Product Changeover
Quickly adjust the stroke end-point on packaging lines when switching to a new carton size, saving downtime on the factory floor.
Long-Stroke Guiding
Useful for pushing loads over long distances where the 100 mm adjustment window allows fine-tuning of the final resting position against a fixed external guide.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-100 the Right Cylinder?
Choose this 40 mm bore when an 32 mm bore (402 N push at 0.5 MPa) lacks the necessary thrust, but you want to avoid the larger footprint of a 50 mm cylinder. An adjustable stroke is preferred over a fixed SAI cylinder when you need precise end-position tuning during machine setup or product changeover without swapping out the entire actuator.
Because the nominal stroke is 650 mm, the 16 mm rod is highly susceptible to side-loading forces; always guide the load externally to prevent binding. The rear adjuster acts only as a travel stop and does not hold the load without live air—use an AirTAC SAIL or BSAI cylinder if fail-safe load holding is required. It is dimensionally interchangeable per ISO 15552, uses a PT port thread, and omits the FB, CA, CB, and CR mounting options found on some other series.
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 SAIJ40BX650-100 FAQ
The rear adjuster screw lets you shorten the 650 mm nominal stroke by up to 100 mm, providing a usable travel window of 550 to 650 mm. This allows fine-tuning of the end position at commissioning without replacing the cylinder.
At 0.5 MPa operating pressure, the 40 mm bore provides 628 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
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