Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX185-20
The AirTAC Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX185-20 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 SAIJ63AX185-20
The AirTAC SAIJ63X185-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 165 to 185 mm, allowing you to dial back the nominal 185 mm stroke by up to 20 mm during commissioning. This bore size delivers a robust 1559 N pull force at 0.5 MPa, making it well-suited for moderate to heavy actuation tasks.
This unit is configured with a SUS420J2 stainless steel rod for enhanced corrosion resistance and uses PT tapered port threads. The rear adjuster acts purely as a mechanical stop to set the travel end and does not hold the load without live air pressure. For applications requiring position holding, consider the SAIL or BSAI series instead.
Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX185-20 Technical Specifications
| Model | Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX185-20 |
|---|---|
| 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 SAIJ63AX185-20
| 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 SAIJ63AX185-20 Is Used
Machine Changeover
Fine-tune the 165-185 mm travel window during product size transitions without physically swapping the cylinder or bolting on external stoppers.
End-Position Tuning
Dial in the exact retract position at commissioning using the rear adjuster, ensuring precise placement without reprogramming the motion controller.
Assembly Line Actuation
Leverage the 1559 N pull force at 0.5 MPa to push and pull heavy pallets or tooling along the conveyor with adjustable end-stops for flexibility.
Is the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX185-20 the Right Cylinder?
Choose this 63 mm bore when you need higher force than the 50 mm class (which provides 825 N pull at 0.5 MPa) but want to avoid the bulk of an 80 mm cylinder. The adjustable stroke is ideal for machine changeovers where the exact end-of-travel position must be fine-tuned on-site without swapping cylinders or adding external stops. To match this ISO 15552 replacement, verify the 185 mm stroke, 20 mm adjustment range, PT G3/8 port, and your required mounting bracket from the SAIJ set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because this unit lacks a magnet (-S), it will not trigger reed or electronic sensors directly.
With a 185 mm stroke, the 20 mm rod diameter handles standard axial loads well, but long unsupported strokes still require an external guide to prevent side-loading damage.
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 SAIJ63AX185-20 FAQ
At 0.5 MPa operating pressure, this 63 mm bore cylinder provides 1559 N of pull force and 2182 N of push force at 0.7 MPa. It can deliver up to 318 kgf at its maximum 1.0 MPa pressure rating.
The rear-mounted adjuster screw lets you shorten the effective stroke from the nominal 185 mm down to 165 mm. This mechanical stop only sets the travel end and decelerates the piston; it does not lock or hold the load without continuous air pressure.
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