Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-40 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
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-40
The AirTAC SAIJ40X850-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the travel window from 810 to 850 mm. Delivering 879 N of push force at 0.7 MPa, it is equipped with a SUS304 stainless steel rod for corrosion resistance and PT tapered ports. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement.
This adjustable model omits the FB, CA, CB and CR mounts, offering a reduced footprint set of Basic, FA, LB, TC, FTC, TCM1 and TCM2. The rear stopper screw sets the retract end position for product changeovers, but it does not hold the load without live air pressure. For true load-holding without live air, consider the SAIL or BSAI series.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-40 |
|---|---|
| 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 SAIJ40 Adjustable Cylinder SAIJ40BX850-40
| 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 SAIJ40 Adjustable Cylinder SAIJ40BX850-40 Is Used
Machine Setup & Changeover
Dial in the exact retract position from 810 to 850 mm during product size changes without swapping cylinders or adding external mechanical stops.
Variable End-Stop Pushing
Adjust the pusher end-point on the fly to accommodate different package lengths on a moving line.
Long-Stroke Assembly Pressing
Use the 850 mm travel to reach distant parts, then fine-tune the final 40 mm of approach for delicate component seating.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-40 the Right Cylinder?
Choose this 40 mm bore if you need slightly less force than the 50 mm bore (which provides 1374 N push at 0.7 MPa) but more than the 32 mm bore (563 N). The 40 mm bore uses a G1/4 port and operates at speeds of 30-800 mm/s. An adjustable stroke is ideal for machine setup where a fixed SAI cylinder would require external stops to dial in the exact end position.
Because the stroke is 850 mm, the 16 mm rod and M12x1.25 thread will experience leverage forces; an external guide is recommended to prevent side-loading damage. To match this exact unit for replacement, specify: 40 mm bore, 850 mm stroke, 40 mm adjustment, PT port, no magnet, SUS304 (B) rod, and the appropriate mounting option.
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 SAIJ40BX850-40 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 a maximum of 1130 N push force at 0.9 MPa.
The rear adjuster screw acts as a stopper that lets you shorten the effective stroke by up to 40 mm, creating a usable travel window of 810 to 850 mm. This allows precise end-position tuning at commissioning without replacing the cylinder.
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