Airtac SAIJ125 Adjustable Cylinder SAIJ125X30-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X30-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 30mm 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
- Stroke30 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X30-20
The AirTAC SAIJ125X30-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers a robust 6136N push force at 0.5MPa, making it suited for heavy-duty positioning. The integrated adjustment screw allows you to trim the 30mm nominal stroke back by up to 20mm, yielding a highly precise 10-30mm usable travel window for exact end-position tuning during commissioning.
This extruded aluminum profile cylinder includes sensor grooves on both sides for flexible switch placement. It uses a PT tapered port thread and a 32mm carbon steel rod with an M27x2 thread, providing high rigidity against side loads. The variable air cushions at both ends manage deceleration, while the rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X30-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X30-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 30 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 SAIJ125X30-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×30 | 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 SAIJ125X30-20 Is Used
Heavy Clamping Positioning
Dial in the exact 10-30mm clamping depth on heavy fixtures during machine setup, compensating for material thickness variations without external stop blocks.
Product Changeover
Quickly adjust the retract end-stop on a packaging line when switching to a different product size, using the rear screw to fine-tune the stroke on the fly.
Short-Stroke Pressing
Execute high-force pressing or forming tasks where the 6136N output is required, but the final bottoming position needs micro-adjustments at commissioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X30-20 the Right Cylinder?
Selecting this 125mm bore cylinder is ideal when an application requires substantial force—such as the 6136N push or 5734N pull at 0.5MPa—combined with micro-travel adjustability. If your process requires slightly less force, stepping down to an 80mm bore yields 2513N push force. The SAIJ125X30-20 is chosen over a fixed-stroke SAI when product changeovers demand a variable end-stop without swapping the cylinder or adding external stops. For load-holding without live air pressure, this cylinder is insufficient; you should specify an SAIL (air-released lock) or BSAI (clamp-lock) instead.
To match this exact ISO 15552 replacement, confirm a 125mm bore, 30mm stroke, 20mm adjustment range, PT G3/8 port, and a carbon steel rod. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2. Since the standard stroke is only 30mm, external side-load guides are less critical than on long-stroke units, but the heavy rod thread still handles lateral forces well.
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 SAIJ125X30-20 FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the 30mm nominal stroke by up to 20mm. This creates a 10-30mm usable travel window for fine-tuning the end position without replacing the cylinder.
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