Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-100S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-100S 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 SAIJ40BX650-100S
The AirTAC SAIJ40X650-100-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel down from a 650 mm nominal stroke to a 550 mm minimum. This creates a 100 mm variable end-stop window, enabling precise positioning at commissioning without adding external stops or swapping the barrel. It delivers a robust 879 N push force at 0.7 MPa, making it well-suited for medium-duty positioning tasks.
Equipped with a SUS304 stainless steel rod and a -S magnet, this unit supports AirTAC CMSE reed and DMSE solid-state sensors via the dual-side sensor grooves on its extruded aluminum barrel. The G1/4 PT port and M12x1.25 rod thread handle standard pneumatic flows, while the 30 mm cushioning decelerates the load at both ends. Note that the rear adjuster acts only as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-100S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-100S |
|---|---|
| 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 SAIJ40BX650-100S
| 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 SAIJ40BX650-100S Is Used
Machine Setup & Changeover
Dial in the exact retract position within the 550-650 mm window during product family changeovers without machining new hard stops.
Variable End-Stop Positioning
Adjust the stroke on the fly to accommodate different package sizes or pallet dimensions on a packaging line.
Commissioning Fine-Tuning
Trim the travel back by up to 100 mm to perfectly time the machine sequence and avoid mechanical crashes during setup.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-100S the Right Cylinder?
Select this adjustable-stroke cylinder when a fixed 650 mm SAI unit lacks the flexibility needed for product changeovers or exact end-position tuning. If your application requires less force, stepping down to a bore 32 model yields 563 N at 0.7 MPa; if higher thrust is needed, a bore 50 unit provides 1374 N. Because the 650 mm stroke is relatively long, an external guide is recommended to prevent excessive side-loading on the M12x1.25 rod. For load-holding without live pressure, consider a SAIL or BSAI variant, as the SAIJ adjuster is a stop, not a lock. ISO 15552 interchangeability ensures it matches the bore, stroke, 100 mm adjustment, PT port, and -S magnet footprint.
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 SAIJ40BX650-100S FAQ
At a 0.7 MPa operating pressure, this 40 mm bore cylinder provides a push force of 879 N and a pull force of 528 N. The maximum allowable operating pressure is 1.0 MPa.
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 precise end-position tuning without replacing the cylinder.
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