Airtac SAID40 Double Rod Cylinder SAID40BX650
The AirTAC Airtac SAID40 Double Rod Cylinder SAID40BX650 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 SAID40 Double Rod Cylinder SAID40BX650
The AirTAC SAID40X650 is a double-acting, double-rod ISO 15552 profile cylinder engineered for symmetric actuation. Because the SUS304 stainless steel piston rod exits both end covers, the annulus area is identical on extend and retract, yielding an equal 528 N of force in both directions at 0.5 MPa. The twin-rod architecture inherently resists torsional rotation, keeping the payload securely guided throughout the 650 mm travel.
This configuration omits the magnet, relying on external physical stops, while the PT tapered port threads ensure a robust pneumatic seal. The extruded aluminum barrel integrates sensor grooves on both sides, and adjustable air cushions at both ends absorb kinetic energy near the stroke limits to prevent end-cap impact.
Airtac SAID40 Double Rod Cylinder SAID40BX650 Technical Specifications
| Model | Airtac SAID40 Double Rod Cylinder SAID40BX650 |
|---|---|
| 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 SAID40 Double Rod Cylinder SAID40BX650
| 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 SAID40 Double Rod Cylinder SAID40BX650 Is Used
Symmetric Force Transfer
Drives a workpiece from one end while simultaneously moving a secondary assembly from the rear rod, maintaining equal 528 N thrust and matching speeds in both directions.
Anti-Rotation Slides
The twin SUS304 rods prevent torsional deflection over the 650 mm stroke, ensuring precise linear tracking for heavy sliding payloads without external guides.
Dual-Station Actuation
Operates two synchronized workstations from a single piston, using the through-rod design to space tooling equally on opposite sides of the machine frame.
Is the Airtac SAID40 Double Rod Cylinder SAID40BX650 the Right Cylinder?
Selecting this 40 mm bore over the smaller 32 mm variant steps the bidirectional force up from 345 N to 528 N at 0.5 MPa, providing greater thrust for twin-station drives. Conversely, if your payload exceeds these limits, stepping up to the 50 mm bore offers 825 N. The double-rod design is specifically chosen when a secondary mechanism, cam, or limit flag must be driven from the rear rod end, or when strict anti-rotation guidance is required compared to a standard single-rod SAI cylinder.
At 650 mm of stroke, the unsupported rod length increases susceptibility to bending under side loads; utilizing an external linear guide is critical to prevent premature bearing wear. Note that the adjustable cushions only decelerate the piston and do not hold the load—if air pressure is lost, the cylinder will drift, requiring an external pilot-operated check valve for position holding. Mounting options are limited to the SAID subset: 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 SAID40 Double Rod Cylinder SAID40BX650 FAQ
Because the rod occupies both sides of the piston, the effective area is identical in both directions. It delivers an equal 528 N of force on both extend and retract at 0.5 MPa, and 739 N at 0.7 MPa.
Yes, the SAID40X650 is dimensionally interchangeable per ISO 15552 and serves as a drop-in replacement for other standard profile double-rod cylinders, utilizing PT G1/4 ports and the standard SAID mounting interface.
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