Airtac SAIJ50 Adjustable Cylinder SAIJ50AX25-20
The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50AX25-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø50mm bore and 25mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ50 mm
- Stroke25 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 30 mm
About the Airtac SAIJ50 Adjustable Cylinder SAIJ50AX25-20
The AirTAC SAIJ50X25-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 5 to 25 mm, letting you dial back the nominal 25 mm stroke by up to 20 mm during commissioning. Operating at 0.5 MPa, it delivers 982 N of push force and 825 N of pull force.
This unit uses a SUS420J2 stainless steel piston rod for improved corrosion resistance and is fitted with PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, and the standard variable air cushions at both ends decelerate the load before the external stopper makes contact.
Airtac SAIJ50 Adjustable Cylinder SAIJ50AX25-20 Technical Specifications
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50AX25-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø50 mm |
| Stroke | 25 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| 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, 30 mm |
| Max stroke | Up to 1200 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ50 Adjustable Cylinder SAIJ50AX25-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×25 | 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 SAIJ50 Adjustable Cylinder SAIJ50AX25-20 Is Used
Machine Changeover
Quickly adjust the end-stop from 5 to 25 mm to accommodate different product sizes on the same line without changing hardware.
Clamp Positioning
Fine-tune the clamping travel during setup to ensure precise contact force on delicate components.
Assembly End-Stop
Dial in the exact extension distance during commissioning to guarantee repeatable placement of parts.
Is the Airtac SAIJ50 Adjustable Cylinder SAIJ50AX25-20 the Right Cylinder?
Choose this 50 mm bore when an application requires more force than a 40 mm cylinder (which provides 628 N push at 0.5 MPa) but lacks the space for a 63 mm unit. The adjustable stroke is ideal for product changeovers, allowing you to fine-tune the end position without swapping the cylinder or adding external stops.
For strokes of 25 mm, side-load risks are minimal, but the 16 mm rod and M12x1.25 thread handle standard loads well. The rear adjuster acts only as a travel stop and does not hold the load without live air; for true load-holding, consider the SAIL or BSAI series. This model uses the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets.
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 SAIJ50 Adjustable Cylinder SAIJ50AX25-20 FAQ
At an operating pressure of 0.5 MPa, the SAIJ50X25-20 cylinder provides 982 N of push force and 825 N of pull force.
The rear adjuster allows you to shorten the 25 mm nominal stroke by up to 20 mm, giving a usable travel window of 5 to 25 mm for fine-tuning the end position.
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