Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-50 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 SAIJ40BX650-50
The AirTAC SAIJ40X650-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 600-650 mm usable travel window, letting you dial back the 650 mm nominal stroke by up to 50 mm during commissioning. With a 16 mm rod and M12x1.25 thread, it delivers 879 N of push force at 0.7 MPa.
This model uses a SUS304 stainless steel rod for superior corrosion resistance and PT tapered port threads. It includes adjustable air cushions at both ends, but note that the rear adjuster acts only as a travel stop—it will not hold a load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-50 |
|---|---|
| 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 SAIJ40BX650-50
| 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 SAIJ40BX650-50 Is Used
Machine Changeover
Quickly adjust the end-stop by up to 50 mm to accommodate different product sizes on the same production line without changing the cylinder.
End-Position Tuning
Fine-tune the 600-650 mm travel window during setup to hit exact mechanical stops without adding external physical spacers.
Extended Reach Assembly
Utilize the 650 mm stroke for long-travel pick-and-place tasks while retaining the flexibility to shorten the effective movement if needed.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-50 the Right Cylinder?
Choose this 40 mm bore when you need precise end-position tuning without swapping cylinders or adding external stops. If your application requires less force, the 32 mm bore offers 563 N at 0.7 MPa; for higher loads, the 50 mm bore provides 1374 N.
Because the 650 mm stroke is long, an external guide is recommended to prevent side-loading damage to the rod. For load-holding without continuous air pressure, consider the SAIL or BSAI series instead. This SAIJ configuration is dimensionally interchangeable per ISO 15552 and includes a PT port, SUS304 rod, and no magnet.
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 SAIJ40BX650-50 FAQ
At 0.7 MPa operating pressure, this 40 mm bore cylinder provides 879 N of push force and 528 N of pull force. It can reach up to 1130 N push at 0.9 MPa.
A rear adjusting screw acts as a stopper, allowing you to shorten the effective travel from 650 mm down to 600 mm. The adjuster is a stop, not a lock, so live air is still required to hold the load.
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