Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX185-20S
The AirTAC Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX185-20S 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 SAIJ63AX185-20S
The AirTAC SAIJ63X185-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It features a 63mm bore and a 185mm nominal stroke that can be fine-tuned backward by up to 20mm, creating a precise usable travel window of 165-185mm. This built-in adjuster allows you to dial in the retract end-position at commissioning without swapping out the cylinder or adding external stops. Delivering 2182N of push force at 0.7MPa, it handles robust actuation tasks while utilizing self-lubricating variable air cushions at both ends to decelerate the piston smoothly.
This variant includes a piston magnet for position sensing and is compatible with AirTAC CMSE reed and DMSE electronic solid-state switches. It features a SUS420J2 stainless steel rod for enhanced corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. Mounting options include the standard SAIJ subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR brackets.
Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX185-20S Technical Specifications
| Model | Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX185-20S |
|---|---|
| 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 SAIJ63AX185-20S
| 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 SAIJ63AX185-20S Is Used
Machine Changeover
Dial in the 165-185mm travel window during product size changes without replacing the cylinder or adding external stopper blocks.
End-Stop Tuning
Fine-tune the retract end-position at commissioning to absorb mechanical tolerances and achieve precise positioning of the tooling.
Assembly Actuation
Provides 2182N of thrust at 0.7MPa for pressing or lifting tasks, with variable air cushions ensuring smooth deceleration.
Is the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX185-20S the Right Cylinder?
Choose this 63mm bore cylinder when your application requires 2182N of push force at 0.7MPa and on-the-fly end-stop tuning. If your process demands less force, stepping down to a 50mm bore yields 1374N of push force; if you need heavier thrust, an 80mm bore provides 3518N. The adjustable stroke is ideal for product changeovers or fine-tuning a machine setup without machining external stopper blocks. Remember that the rear adjuster acts only as a mechanical travel stop and does not hold the load without live air; for true fail-safe load holding, consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder. For an exact ISO 15552 replacement, match the 63mm bore, 185mm stroke, 20mm adjustment, PT ports, SUS420J2 rod, and -S magnet specifications.
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 SAIJ63AX185-20S FAQ
The rear adjuster screw allows you to shorten the 185mm nominal stroke by up to 20mm, providing a usable travel window of 165-185mm. It acts as a mechanical stop to set the end position and does not lock the load without live air pressure.
At a 0.7MPa operating pressure, the SAIJ63X185-20-S generates 2182N of push force and 1402N of pull force. The maximum thrust is 318 kgf at 1.0MPa.
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