Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX250-75S
The AirTAC Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX250-75S 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 SAIJ63AX250-75S
The AirTAC SAIJ63X250-75-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 175-250 mm usable travel window, allowing you to dial back the nominal 250 mm stroke by up to 75 mm during machine setup. In the 63 mm bore class, it generates 2182 N of push force and 1402 N of pull force at 0.7 MPa.
This variant uses a SUS420J2 stainless steel rod for improved corrosion resistance and includes a built-in magnet for position sensing. The dual-side sensor grooves accept AirTAC CMSE reed and DMSE electronic solid-state switches. Unlike fixed-stroke SAI units, this model lets you fine-tune end positions without swapping the barrel or adding external stops.
Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX250-75S Technical Specifications
| Model | Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX250-75S |
|---|---|
| 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 SAIJ63AX250-75S
| 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 SAIJ63AX250-75S Is Used
Variable End-Stop Calibration
Dial in the exact retract distance within the 175-250 mm window during machine commissioning to perfect positioning without mechanical spacers.
Product-Size Changeover
Quickly adapt a packaging line to different carton lengths by turning the rear adjustment screw to shift the end of stroke up to 75 mm.
Machining Fixture Setup
Fine-tune clamping travel on the fly, using the 2182 N thrust at 0.7 MPa to secure parts while accommodating varying raw material dimensions.
Is the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX250-75S the Right Cylinder?
Choose this 63 mm bore cylinder when your application requires 2182 N of thrust at 0.7 MPa but demands flexible end-position tuning. If you need less force, stepping down to a 50 mm bore yields 1374 N push at 0.7 MPa. If your machine requires higher force, an 80 mm bore provides 3518 N. The generous 75 mm adjustment range is ideal for product-size changeovers, letting you shift the end stop dynamically rather than maintaining a stock of multiple fixed-stroke cylinders.
To replace an ISO 15552 cylinder, match the 63 mm bore, 250 mm stroke, G3/8 PT ports, and the -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the total stroke is 250 mm, ensure external guides support any heavy loads to prevent rod side-load damage. Remember that the rear adjuster is a travel stop, not a lock; for load-holding without live air, use an external rod lock or select an AirTAC SAIL or BSAI series cylinder.
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 SAIJ63AX250-75S FAQ
The rear adjuster acts as an external stopper that shortens the retract stroke. For this model, you can trim the effective travel back by up to 75 mm, creating a usable stroke window of 175 to 250 mm. It only sets the travel end and does not lock the load without live air pressure.
At 0.7 MPa operating pressure, this double-acting cylinder provides 2182 N of push force and 1402 N of pull force. The standard speed range for this bore size is 30-800 mm/s, and it features variable air cushions at both ends to decelerate the piston.
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