Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-40 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 SAIJ40BX650-40
The AirTAC SAIJ40X650-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 610 to 650 mm usable travel window. Delivering 628 N of push force at 0.5 MPa, it utilizes a SUS304 stainless steel rod for superior corrosion resistance. The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU omits the magnet, meaning CMSE or DMSE switches cannot be used without modification.
A defining trait of this adjustable model is its ability to fine-tune the retract end-position at commissioning without swapping hardware. The rear stopper screw acts purely as a travel limit and works in tandem with the 30 mm variable air cushion to decelerate the load. It is not a locking device, so external guides or pilot-operated check valves are required to hold loads safely without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-40 |
|---|---|
| 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 SAIJ40BX650-40
| 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 SAIJ40BX650-40 Is Used
Machine Changeover
Dial in the 610-650 mm retract position during product size changes without physically swapping cylinders or installing external mechanical stops.
Variable Diverting
Adjust the stroke on the fly to handle different package sizes on a conveyor line, ensuring precise positioning at the 40 mm thrust class.
End-Stop Tuning
Fine-tune the final end-position during machine commissioning to perfect the mechanical timing without disassembling the fixture.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-40 the Right Cylinder?
Choose this 40 mm bore when an application requires less thrust than the 50 mm bore (which provides 982 N push at 0.5 MPa) but more than the 32 mm option (402 N). The adjustable 40 mm window is ideal for product changeovers on a line, allowing operators to dial in the exact end-stop without adding external shims. For fixed-position tasks, the standard SAI cylinder is sufficient, but the SAIJ variant excels in setups demanding variable end-stops.
When replacing an ISO 15552 cylinder, match the 40 mm bore, 650 mm stroke, PT tapered port thread, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the 650 mm stroke is long, the 16 mm rod and M12x1.25 thread will experience leverage forces; always support the load with an external guide to prevent excessive side-loading. For load-holding without air, 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 SAIJ40BX650-40 FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw allows you to shorten the 650 mm nominal stroke by up to 40 mm, creating a 610 to 650 mm travel window. It functions as a stop for end-position tuning and is not a lock.
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