Airtac SAIJ100 Adjustable Cylinder SAIJ100BX850-20
The AirTAC Airtac SAIJ100 Adjustable Cylinder SAIJ100BX850-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø100mm bore and 850mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ100 mm
- Stroke850 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ100 Adjustable Cylinder SAIJ100BX850-20
The AirTAC SAIJ100X850-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 5497N push force at 0.7 MPa and uses a 25mm SUS304 stainless steel rod for high corrosion resistance. A PT G1/2 port handles the pneumatic supply. The integrated rear stopper screw allows you to trim the effective travel, creating an 830 to 850mm usable stroke window without adding external stops.
This adjustable capability lets you fine-tune the retract end position during commissioning or product changeover. The adjuster acts strictly as a travel stop to set deceleration, not as a lock, so it will not hold the load without live air. The extruded aluminum barrel includes sensor grooves on both sides, and the variable air cushions at both ends absorb kinetic energy. The cylinder supports speeds from 30 to 800mm/s.
Airtac SAIJ100 Adjustable Cylinder SAIJ100BX850-20 Technical Specifications
| Model | Airtac SAIJ100 Adjustable Cylinder SAIJ100BX850-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø100 mm |
| Stroke | 850 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M20×1.5 |
| 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, 36 mm |
| Max stroke | Up to 1500 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 (Ø100mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 3927 N | 3682 N |
| 0.7 MPa | 5498 N | — |
| Max (@1.0 MPa) | 801 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ100 Adjustable Cylinder SAIJ100BX850-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 100 | 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 SAIJ100 Adjustable Cylinder SAIJ100BX850-20 Is Used
Machine Changeover
Dial in the 830-850mm retract position during product size changes without swapping cylinders or repositioning external stopper blocks.
End-Position Tuning
Fine-tune the exact end of stroke at commissioning to absorb mechanical tolerance and ensure precise positioning of heavy 100mm bore tooling.
Variable End Stops
Set custom travel limits for automated assembly lines where the rear stop screw adjusts the stroke to meet varying process requirements.
Is the Airtac SAIJ100 Adjustable Cylinder SAIJ100BX850-20 the Right Cylinder?
Choose this 100mm bore when an 80mm bore (3518N at 0.5 MPa) lacks thrust or a 125mm bore (6136N at 0.5 MPa) is too bulky. The 20mm adjustment window is ideal for setting precise retract limits on long-stroke tooling. Since the 850mm stroke is long, the 25mm rod and M20x1.5 thread handle side loads well, but you must use an external guide to prevent rod binding. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
For a drop-in ISO 15552 replacement, match the 100mm bore, 850mm stroke, 20mm adjust, PT G1/2 port, SUS304 (B) rod, and no magnet. If you need load-holding without live pressure, use a SAIL lock or BSAI clamp-lock cylinder instead of relying on the adjuster.
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 SAIJ100 Adjustable Cylinder SAIJ100BX850-20 FAQ
At 0.7 MPa operating pressure, this 100mm bore cylinder generates a push force of 5497N and a pull force of 3681N. It can reach a maximum push force of 7068N at 0.9 MPa.
The rear adjuster screw lets you shorten the 850mm nominal stroke by up to 20mm, providing an 830 to 850mm usable travel window. The screw acts as a mechanical stop to fine-tune the end position and does not lock the load without live air pressure.
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