Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX250-20S
The AirTAC Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX250-20S 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 SAIJ63AX250-20S
The AirTAC SAIJ63X250-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 230 to 250 mm for precise end-position tuning. Driven by a 20 mm carbon steel rod with an M16x1.5 thread, it delivers 1559 N of push force and 1402 N of pull force at 0.5 MPa. The integrated -S magnet enables position detection, functioning seamlessly with AirTAC CMSE reed and DMSE electronic solid-state sensors mounted in the dual-side barrel grooves.
This variant features a SUS420J2 stainless steel rod (material code A) for improved corrosion resistance and uses PT tapered port threads. The rear adjustment screw acts purely as a mechanical stop to trim the retract distance during commissioning; it does not lock the load. For applications requiring true load-holding without live air pressure, consider the SAIL or BSAI series instead.
Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX250-20S Technical Specifications
| Model | Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX250-20S |
|---|---|
| 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 SAIJ63AX250-20S
| 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 SAIJ63AX250-20S Is Used
Changeover Calibration
Dial in the 230-250 mm retract stop during product size changeovers without physically swapping the cylinder or adding external shims.
End-Position Truing
Fine-tune the final retract position at machine commissioning to achieve precise mechanical alignment using the rear stopper screw.
Assembly Line Actuation
Drive clamping or lifting actions with 1559 N push force at 0.5 MPa while tracking position via CMSE or DMSE sensors.
Is the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX250-20S the Right Cylinder?
Select this 63 mm bore when a 50 mm bore (offering 982 N push at 0.5 MPa) lacks the necessary thrust, but an 80 mm bore (providing 2513 N) would be physically oversized. The 20 mm adjustment window is ideal for product changeovers on a line, allowing you to dial in the exact end-stop without swapping cylinders or adding external stops. Because the nominal stroke is 250 mm, an external guide is recommended to prevent excessive side-loading on the rod.
To match this exact configuration for an ISO 15552 replacement, specify: 63 mm bore, 250 mm stroke, 20 mm adjustment, PT port threads, SUS420J2 rod material, the -S magnet, and a mounting choice from the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that FB, CA, CB, and CR mounts are omitted from this adjustable series.
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 SAIJ63AX250-20S FAQ
The rear adjuster screw lets you shorten the effective stroke by up to 20 mm, creating a usable travel window of 230 to 250 mm. It acts as a mechanical stop for end-position tuning and does not lock the load without live air.
At 0.5 MPa operating pressure, it provides 1559 N of push force and 1402 N of pull force. At 0.7 MPa, the push force increases to 2182 N.
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