Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX185-40
The AirTAC Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX185-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø63mm bore and 185mm 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
- Stroke185 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX185-40
The AirTAC SAIJ63X185-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 145-185 mm, allowing you to trim the nominal 185 mm stroke by up to 40 mm during commissioning. Delivering a push force of 2182 N at 0.7 MPa, it fits perfectly into medium-force pneumatic setups.
This variant uses an SUS420J2 stainless steel rod (option A) for enhanced corrosion resistance compared to standard carbon steel. The extruded aluminum barrel includes sensor grooves on both sides, and fluid connections use PT tapered threads sized at G3/8. The rear adjuster acts purely as a mechanical stop to fine-tune the retract position, meaning it will not hold a load without continuous live air pressure.
Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX185-40 Technical Specifications
| Model | Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX185-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø63 mm |
| Stroke | 185 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 SAIJ63AX185-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 63 | Bore size in mm. |
| ×185 | 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 SAIJ63AX185-40 Is Used
Changeover Calibration
Dial in the exact 145-185 mm retract distance during product size changeovers without machining new hard stops.
End-Stop Tuning
Fine-tune the final end position during machine commissioning to prevent mechanical crashes and optimize clamping force.
Variable Positioning
Provide adjustable retraction limits on automated assembly lines where multiple product variants run on the same conveyor.
Is the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX185-40 the Right Cylinder?
Select this 63 mm bore cylinder when an application requires precise end-position tuning without swapping components; it delivers 2182 N of push force at 0.7 MPa, bridging the gap between the 50 mm bore (1374 N) and the 80 mm bore (3518 N). Choose the SAIJ adjustable design over a fixed SAI cylinder when you anticipate product changeovers or need to dial in a precise 145-185 mm travel distance on the machine.
For a direct ISO 15552 replacement match, ensure you specify the 63 mm bore, 185 mm nominal stroke, 40 mm adjustment range, PT G3/8 port thread, and the SUS420J2 rod material. Since the stroke is under 300 mm, side-load stress is manageable, but external guides are still recommended for heavy lateral loads. If your process requires true load-holding without air pressure, consider the SAIL or BSAI locking cylinders instead of relying on this rear stopper.
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 SAIJ63AX185-40 FAQ
At a standard operating pressure of 0.7 MPa, this 63 mm bore cylinder generates 2182 N of push force and 1402 N of pull force. It can reach a maximum push force of 2805 N at 0.9 MPa.
The rear mechanical stopper allows you to shorten the effective stroke by up to 40 mm, creating a usable travel window of 145 to 185 mm. This stopper only sets the travel end point and does not function as a lock to hold the load without air pressure.
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