Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX250-20
The AirTAC Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX250-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø63mm bore and 250mm 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
- Stroke250 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX250-20
The AirTAC SAIJ63X250-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 230 to 250 mm, allowing you to dial back the nominal 250 mm stroke by up to 20 mm during commissioning. Delivering 2182 N of push force at 0.7 MPa, it fits medium-force applications perfectly.
This model 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, ready for AirTAC CMSE reed or DMSE electronic sensors if a magnet is added later. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX250-20 Technical Specifications
| Model | Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX250-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø63 mm |
| Stroke | 250 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 SAIJ63AX250-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 63 | Bore size in mm. |
| ×250 | 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 SAIJ63AX250-20 Is Used
Machine Setup Fine-Tuning
Dial in the exact 230 to 250 mm end-of-stroke position during machine commissioning without machining new spacers.
Product Size Changeover
Quickly adjust the retract stop by up to 20 mm to accommodate slightly shorter product lengths on a packaging line.
Variable End Stops
Use the rear stopper screw to set precise lower mechanical limits for press operations within the 63 mm force class.
Is the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX250-20 the Right Cylinder?
Choose this 63 mm bore when you need 2182 N push force at 0.7 MPa, bridging the gap between the 50 mm bore (1374 N) and the 80 mm bore (3518 N). The adjustable stroke is selected over a fixed SAI when you need fine end-position tuning or product changeover flexibility without swapping the cylinder or adding external stops. To match this ISO 15552 replacement exactly, specify the 63 mm bore, 250 mm stroke, 20 mm adjustment, PT G3/8 port, and the desired mounting from the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, TCM2).
Because the stroke is 250 mm, the M16x1.5 rod should be guided externally if heavy side loads are present. Remember that the rear adjuster is a stop, not a lock; for fail-safe load holding without live air, use an SAIL or BSAI cylinder instead.
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 SAIJ63AX250-20 FAQ
At 0.7 MPa operating pressure, this 63 mm bore cylinder provides 2182 N of push force and 1402 N of pull force. The maximum allowable operating pressure is 1.0 MPa.
The rear adjuster screw lets you shorten the 250 mm nominal stroke by up to 20 mm, creating a usable travel window of 230 to 250 mm. It acts as a mechanical stop to fine-tune the end position and does not lock or hold the load without continuous air pressure.
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