Airtac SAID40 Double Rod Cylinder SAID40BX850
The AirTAC Airtac SAID40 Double Rod Cylinder SAID40BX850 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 850mm 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
- Stroke850 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAID40 Double Rod Cylinder SAID40BX850
The AirTAC SAID40X850 is a double-acting, double-rod ISO 15552 profile cylinder featuring a 40mm bore and an 850mm stroke. Because the piston rod extends from both end covers, the effective annulus area is identical on both sides. This yields perfectly symmetrical thrust, delivering 528N of force in both extend and retract directions at 0.5 MPa. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement.
This specific configuration utilizes a SUS304 stainless steel rod (material code B) for superior corrosion resistance in humid or washdown environments. Ports are PT tapered thread. The rear rod protrusion allows you to mount a secondary cam, position flag, or drive a second mechanism while keeping the load guided against rotation. It supports adjustable air cushioning at both ends (30mm cushion length) to decelerate the piston smoothly.
Airtac SAID40 Double Rod Cylinder SAID40BX850 Technical Specifications
| Model | Airtac SAID40 Double Rod Cylinder SAID40BX850 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 850 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 SAID40BX850
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×850 | 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 SAID40BX850 Is Used
Symmetric Force Transfer
Drives a transfer carriage where the equal 528N extend and retract forces at 0.5 MPa prevent speed fluctuations during bidirectional material handling.
Anti-Rotation Slides
The twin 16mm SUS304 rods keep a vertical sliding fixture perfectly guided across the 850mm stroke, resisting torsional twist without external rails.
Rear-Cam Actuation
Uses the protruding rear rod end to trip a mechanical limit switch or pilot valve, sequencing a secondary operation independently from the front workpiece.
Is the Airtac SAID40 Double Rod Cylinder SAID40BX850 the Right Cylinder?
Choose this 40mm bore when an application requires equal push and pull forces (528N at 0.5 MPa) alongside dual-side anti-rotation guidance. If your mechanism needs less force, stepping down to a 32mm bore provides 345N both ways, whereas a 50mm bore offers 825N for heavier loads. Unlike a single-rod SAI cylinder, this double-rod SAID variant is selected when you need to actuate twin stations or mount a rear sensor flag. To detect piston position, you would need the -S magnet variant to use AirTAC CMSE (reed) or DMSE (electronic) switches.
At 850mm, this stroke is near the maximum standard limit for a 40mm bore. For an unsupported length of this size, the 16mm rod and M12x1.25 thread face increased bending risks from side loads. An external guide rail is highly recommended to prevent premature rod-bearing wear. Note that a plain SAID does not hold position when air pressure is lost; for locking needs, consider the BSAID clamp-lock variant. It is dimensionally interchangeable per ISO 15552 and uses the Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounting set.
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 SAID40BX850 FAQ
Because the double-rod design subtracts the 16mm rod area from both sides of the piston, the force is equal in both directions. It provides 528N at 0.5 MPa, 739N at 0.7 MPa, and 950N at 0.9 MPa for both extend and retract strokes.
Yes, the SAID40X850 is dimensionally interchangeable per ISO 15552 and uses a standard mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). It serves as a drop-in replacement for other ISO 15552 double-rod profile cylinders, provided you account for the rear rod clearance.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Request a Quote for Airtac SAID40 Double Rod Cylinder SAID40BX850
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.