Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-100S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-100S 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 SAIJ40BX850-100S
The AirTAC SAIJ40X850-100-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 850mm stroke that can be dialed back by up to 100mm, creating a 750-850mm usable travel window for exact end-position tuning during commissioning. Delivering 879N of push force at 0.7MPa, it is built with a SUS304 stainless steel rod for corrosion resistance and includes a magnet for CMSE or DMSE sensors.
This adjustable-stroke design eliminates the need to swap cylinders or add external stops when refining the retract end. The rear adjuster acts strictly as a mechanical stop and works alongside the 30mm air cushions to decelerate the load, but it does not hold the position without live air. For load-holding without pressure, an external rod lock or SAIL cylinder is required.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-100S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-100S |
|---|---|
| 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 SAIJ40BX850-100S
| 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 SAIJ40BX850-100S Is Used
Product Changeover
Dial in the 750-850mm travel window during format changes without swapping the cylinder or adding external hard stops.
Long-Stroke Diverter
Fine-tune the retract position of a long-travel diverter arm to accommodate varying package sizes on a conveyor line.
Assembly Press Tuning
Precisely set the end-stop for an 879N assembly press during commissioning to guarantee consistent part seating.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-100S the Right Cylinder?
Choose this 40mm bore when 879N of thrust at 0.7MPa is sufficient, or step up to the 50mm bore if you need 1374N. The adjustable 750-850mm window is ideal for product changeovers on a line, allowing you to fine-tune the retract position without machining new hard stops. Because the 850mm stroke is long, an external guide is highly recommended to prevent side-loading on the 16mm rod and M12x1.25 thread.
For a true ISO 15552 replacement match, verify the 40mm bore, 850mm nominal stroke, 100mm adjustment, PT tapered port threads, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR configurations. This cylinder operates at speeds of 30-800mm/s.
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 SAIJ40BX850-100S FAQ
The rear adjuster allows you to shorten the effective stroke by up to 100mm from the nominal 850mm, providing a 750-850mm travel window. The adjuster acts as a mechanical stop to set the end position and does not lock or hold the load without continuous air pressure.
At 0.7MPa operating pressure, this 40mm bore cylinder provides 879N of push force and 528N of pull force. It can deliver up to 1130N of push force at 0.9MPa.
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