Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X850-40S
The AirTAC Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X850-40S 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 SAIJ63X850-40S
The AirTAC SAIJ63X850-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 810 to 850 mm, allowing you to dial back the 850 mm nominal stroke by up to 40 mm during machine commissioning. In the 63 mm bore class, it delivers 2182 N of push force and 1402 N of pull force at 0.7 MPa.
This unit includes a -S magnet for position sensing and is equipped with carbon steel rod material. The extruded aluminum barrel incorporates sensor grooves on both sides, directly supporting AirTAC CMSE reed and DMSE electronic solid-state switches. Unlike a fixed-stroke SAI, this rear stopper mechanism lets you fine-tune the retract end position without adding external stops.
Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X850-40S Technical Specifications
| Model | Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X850-40S |
|---|---|
| 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 SAIJ63X850-40S
| 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 SAIJ63X850-40S Is Used
Product Size Changeovers
Quickly adapt machinery for varying product lengths by adjusting the retract stop from 810 to 850 mm without swapping the cylinder.
End-Position Tuning
Fine-tune the exact end-of-stroke position during machine commissioning to perfect timing and avoid mechanical hard stops.
Long-Stroke Assembly
Drive large components over an 850 mm travel path while retaining the flexibility to shorten the stroke by up to 40 mm for setup flexibility.
Is the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X850-40S the Right Cylinder?
Choose this 63 mm bore cylinder when your application requires 2182 N push force at 0.7 MPa but needs on-the-fly end-position tuning. If you need less force, the 50 mm bore provides 1374 N push; if you need more, the 80 mm bore yields 3518 N. Because the 850 mm stroke is long, the 20 mm rod diameter and M16x1.5 rod thread will still experience leverage forces, so an external guide is recommended to prevent side-load damage.
The rear adjuster acts purely as a travel stop and cannot hold a load without live air pressure. If your application requires fail-safe load holding, select the SAIL pneumatic lock or BSAI clamp-lock cylinder instead of relying on the SAIJ adjuster or its air cushions. This PT ported model is dimensionally interchangeable per ISO 15552 and supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ63X850-40S FAQ
At 0.7 MPa operating pressure, this 63 mm bore cylinder provides 2182 N of push force and 1402 N of pull force. It can deliver up to 318 kgf at its maximum 1.0 MPa pressure rating.
The rear adjuster allows you to shorten the 850 mm nominal stroke by up to 40 mm, creating a usable travel window of 810 to 850 mm. The adjuster is a mechanical stop that sets the end position, not a lock, so the cylinder requires live air to maintain its position.
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