Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-30 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 SAIJ125AX210-30
The AirTAC SAIJ125X210-30 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 210 mm nominal stroke that can be dialed back by up to 30 mm, yielding a highly versatile 180-210 mm usable travel window for precise end-position tuning during commissioning. Equipped with a SUS420J2 stainless steel rod and PT tapered ports, it delivers a robust 6136 N pull force at 0.5 MPa, making it suitable for heavy-duty operations.
This adjustable-stop design eliminates the need to physically swap cylinders or bolt on external stoppers when accommodating minor product size changes on a line. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of CMSE reed or DMSE electronic sensors. It supports a speed range of 30-500 mm/s and uses the SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting FB, CA, CB, and CR brackets.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-30 |
|---|---|
| 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 SAIJ125AX210-30
| 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 SAIJ125AX210-30 Is Used
Product Changeover
Dial in the 180-210 mm travel window on the fly to accommodate varying package sizes on a packaging line without swapping out the entire actuator.
Commissioning Fine-Tune
Trim up to 30 mm of the retract stroke during machine setup to perfectly time the end-of-stroke position against a hard mechanical stop.
Heavy Forming End-Stop
Leverage the 6136 N pull force at 0.5 MPa for heavy pressing or forming tasks, using the rear screw to set the exact bottoming-out depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-30 the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (offering 3681 N pull at 0.5 MPa) lacks the necessary thrust, but a 160 mm bore (9425 N pull) would be physical overkill. The adjustable stroke is selected over a fixed SAI model when a process requires variable end-stops or fine-tuning at machine setup without mechanical rework.
For an exact ISO 15552 replacement match, verify the 125 mm bore, 210 mm stroke, 30 mm adjustment range, PT port thread, and the required mounting bracket. Note that the rear adjuster acts strictly as a travel stop and does not hold the load without live air; for true load-holding without pressure, consider the SAIL or BSAI series. Because the stroke exceeds 300 mm threshold checks is bypassed here, the 32 mm rod thread handles side loads well, though long unsupported strokes still need an external guide.
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 SAIJ125AX210-30 FAQ
At 0.5 MPa operating pressure, it provides 6136 N of pull force and 8590 N of push force. At the maximum 1.0 MPa pressure, the push force reaches 11045 N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke by up to 30 mm, creating a 180-210 mm usable travel window. It is a travel stop, not a lock, and requires live air to maintain position.
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