Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 210mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke210 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-30S
The AirTAC SAIJ125X210-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 180-210mm. Delivering 6136N of push force at 0.5MPa, it integrates a SUS420J2 stainless steel rod for enhanced corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel features sensor grooves on both sides, and the integrated magnet (-S) supports electronic DMSE solid-state and CMSE reed switches for precise position feedback.
This adjustable-stroke design allows you to fine-tune the retract end position during commissioning or product changeovers without swapping the cylinder or adding external stops. The rear adjuster acts strictly as a travel stop, working alongside the 40mm variable air cushions at both ends to decelerate the load. It does not hold the load without live air pressure; for true load-holding without continuous pressure, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 210 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 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 (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×210 | 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 SAIJ125 Adjustable Cylinder SAIJ125AX210-30S Is Used
Machine Setup Changeover
Dial in the exact retract position within the 180-210mm window during product size changes without replacing hardware.
Variable End-Stop Tuning
Fine-tune the travel limit at commissioning using the rear screw, avoiding the need to bolt on external stops.
Heavy-Duty Positioning
Leverage 6136N of push force to move heavy fixtures while relying on DMSE sensors for end-position confirmation.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-30S the Right Cylinder?
Choose this 125mm bore when your application requires substantial thrust, stepping up from the 80mm bore which yields 2513N push force at 0.5MPa. The 30mm adjustment range is ideal for machinery requiring variable end-stops or exact positioning during setup. If you need a fixed travel distance without commissioning adjustments, the standard SAI series is a simpler alternative. For drop-in replacements, match the 125mm bore, 210mm stroke, 30mm adjustment, PT ports, and the -S magnet.
With a 210mm stroke, the 32mm diameter rod and M27x2 thread provide robust load support, but long unsupported strokes still require an external guide to prevent side-loading damage. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR. Operating speed for this bore is 30-500mm/s.
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 SAIJ125 Adjustable Cylinder SAIJ125AX210-30S FAQ
At 0.5MPa, it provides 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The rear adjuster lets you shorten the 210mm nominal stroke by up to 30mm, creating a 180-210mm usable travel window. It acts as a stop to set the end position, not as a lock to hold the load.
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