Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-20S 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 SAIJ40BX850-20S
The AirTAC SAIJ40X850-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a usable travel window of 830-850 mm, letting you fine-tune the retract end-position by up to 20 mm directly at the machine without swapping out the unit. Delivering 879 N of push force at 0.7 MPa, it handles mid-range actuation reliably.
This variant features a SUS304 stainless steel rod for corrosion resistance and includes a magnet for CMSE or DMSE sensors. It uses PT tapered ports (G1/4) and relies on variable air cushions at both ends to decelerate the payload. The rear adjuster acts strictly as a travel stop for commissioning flexibility, not a load-holding lock.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-20S |
|---|---|
| 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 SAIJ40BX850-20S
| 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 SAIJ40BX850-20S Is Used
Machine Setup Changeover
Dial in the exact 830-850 mm retract position during format changeovers without physically replacing the cylinder or bolting on external stoppers.
Variable End-Stop Positioning
Fine-tune the stroke end on a conveyor diverter arm by up to 20 mm to compensate for package size variations on the fly.
Long-Stroke Assembly Tuning
Adjust the final end-position of a long 850 mm travel assembly press to perfectly seat components without reprogramming the machine cycle.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-20S the Right Cylinder?
Choose this 40 mm bore when you need 879 N of push force at 0.7 MPa, stepping up from a 32 mm bore (563 N) for higher work demand, or down from a 50 mm bore (1374 N) to save space. An adjustable stroke is ideal for product changeovers, allowing you to dial in the exact 830-850 mm end-stop without adding external physical stops. For a fixed end-position, the standard SAI cylinder is a simpler alternative.
Because the 850 mm stroke is long, the 16 mm rod and M12x1.25 thread will still carry a side-load limit; always use an external guide rail to prevent rod binding. To replace this unit with another ISO 15552 cylinder, match the 40 mm bore, 850 mm stroke, 20 mm adjustment, PT G1/4 port, Basic/FA/LB/TC/FTC/TCM1/TCM2 mounting, and the -S magnet. Note that the plain SAIJ does not hold loads without live air; for pilot-operated holding, use a SAIL or BSAI series.
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 SAIJ40BX850-20S FAQ
It delivers 628 N of push force and 528 N of pull force at 0.5 MPa. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective travel from 850 mm down to 830 mm. This provides a 20 mm tuning window for precise end-position setup without changing the cylinder.
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