Airtac SAIJ80 Adjustable Cylinder SAIJ80AX425-20S
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80AX425-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø80mm bore and 425mm 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.
- BoreØ80 mm
- Stroke425 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ80 Adjustable Cylinder SAIJ80AX425-20S
The AirTAC SAIJ80X425-20-S is a double-acting ISO 15552 profile cylinder with a rear stroke adjuster, delivering 4523N of push force at 0.9 MPa. It features a 25mm SUS420J2 stainless steel rod and a PT G3/8 port. The built-in rear stopper provides a usable travel window of 405-425mm, allowing you to dial back the nominal 425mm stroke by up to 20mm during commissioning. This eliminates the need to swap the cylinder or add external stops when tuning end positions.
Because this is a long-stroke application, the 25mm rod diameter provides rigidity, but an external guide is still recommended to prevent excessive side loading. The extruded aluminum barrel includes sensor grooves on both sides, and the -S magnet option works seamlessly with AirTAC CMSE reed and DMSE electronic solid-state switches. The rear adjuster acts only as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ80 Adjustable Cylinder SAIJ80AX425-20S Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80AX425-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø80 mm |
| Stroke | 425 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M20×1.5 |
| 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 (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ80 Adjustable Cylinder SAIJ80AX425-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 80 | Bore size in mm. |
| ×425 | 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 SAIJ80 Adjustable Cylinder SAIJ80AX425-20S Is Used
Variable End-Stop Tuning
Dial in the exact 405-425mm travel distance during machine commissioning without physically swapping out the entire cylinder for a shorter stroke unit.
Product Size Changeovers
Quickly adjust the rear stopper by up to 20mm to accommodate varying product lengths on a packaging line, ensuring precise positioning without external stops.
Long-Stroke Clamping
Utilize the 4523N of push force at 0.9 MPa to secure large workpieces, fine-tuning the clamping position to account for material thickness variations.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80AX425-20S the Right Cylinder?
Choose this 80mm bore cylinder when your machine requires high thrust (4523N at 0.9 MPa) and precise end-position tuning over a long travel distance. If your application needs less force, stepping down to a 63mm bore provides 2805N of push force at 0.9 MPa. The adjustable stroke is ideal for product changeovers where the exact end-stop varies by up to 20mm.
For an ISO 15552 replacement match, verify the 80mm bore, 425mm stroke, 20mm adjustment range, PT G3/8 port, and the -S magnet. Mounting options are limited to the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). If your machine needs to hold a load without live air pressure, this cylinder's adjuster will not function as a lock; consider the AirTAC SAIL or BSAI series 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 SAIJ80 Adjustable Cylinder SAIJ80AX425-20S FAQ
This 80mm bore cylinder generates 2513N of push force at 0.5 MPa and 4523N at 0.9 MPa. The standard speed range for this bore size is 30-800 mm/s.
The rear adjusting screw acts as a mechanical stop, allowing you to shorten the effective travel from 425mm down to 405mm. It fine-tunes the retract end position but does not lock or hold the load without continuous air pressure.
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