Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X850-20S
The AirTAC Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X850-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø63mm bore and 850mm stroke, G3/8 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ63 mm
- Stroke850 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X850-20S
The AirTAC SAIJ63X850-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 2182 N of push force and 1402 N of pull force at 0.7 MPa. It features a carbon steel rod and a built-in magnet (-S) for position sensing with AirTAC CMSE reed and DMSE electronic switches. The integrated sensor grooves on both sides of the extruded aluminum barrel allow for flexible switch mounting.
With an 850 mm nominal stroke and a 20 mm adjustment range, this model provides a usable travel window of 830 to 850 mm. The rear stopper screw allows you to fine-tune the retract end position at commissioning without swapping the cylinder or adding external stops. The adjuster acts purely as a travel stop to set deceleration; it does not hold the load without live air.
Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X850-20S Technical Specifications
| Model | Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X850-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø63 mm |
| Stroke | 850 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M16×1.5 |
| 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 (Ø63mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X850-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 63 | 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 SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X850-20S Is Used
Variable End-Stop Tuning
Dial in the exact retract position within the 830-850 mm window during machine commissioning without machining new hard stops.
Product Changeover
Quickly adjust the rear stopper screw to accommodate slightly different product lengths on the same production line.
Long-Stroke Positioning
Move loads across an 850 mm span while relying on the external guide to manage side loads and maintain alignment.
Is the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X850-20S the Right Cylinder?
Choose this adjustable-stroke model when a machine setup requires variable end-stops or product changeover flexibility within an 830-850 mm travel window. If an application requires less force, stepping down to a 50 mm bore yields 1374 N of push force at 0.7 MPa. For load-holding without live air pressure, this cylinder is not a lock; you would need an external rod lock or the related AirTAC SAIL or BSAI series. Because the 850 mm stroke is long and unsupported, an external guide is recommended to prevent rod side-loading. To match this ISO 15552 cylinder, specify a 63 mm bore, 850 mm stroke, 20 mm adjustment, PT tapered port, and the -S magnet 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 SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X850-20S FAQ
The rear adjuster screw lets you shorten the effective stroke by up to 20 mm, providing a usable travel window of 830 to 850 mm. It acts as a mechanical stop to fine-tune the end position and does not lock the load without live air pressure.
At 0.7 MPa, the SAIJ63X850-20-S generates 2182 N of push force and 1402 N of pull force. At the maximum operating pressure of 1.0 MPa, it can deliver up to 318 kgf.
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