Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 180mm 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
- Stroke180 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-20
The AirTAC SAIJ125X180-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 180 mm stroke that can be dialed back by up to 20 mm, giving you a precise 160-180 mm usable travel window for fine-tuning end positions at commissioning. In the 125 mm bore class, it delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa.
This model is configured with a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and features PT tapered port threads. It uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits the FB, CA, CB, and CR footprints. The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU is supplied without a magnet for position sensing.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 180 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 SAIJ125AX180-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×180 | 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 SAIJ125AX180-20 Is Used
Machine Changeover
Dial in the 160-180 mm travel window during product size changeovers to set new end positions without replacing the cylinder.
End-Position Tuning
Fine-tune the retract stop during commissioning to perfect the mechanical alignment of heavy 125 mm bore tooling.
Assembly Press Setup
Adjust the stroke on the fly for varying material thicknesses in heavy assembly presses without bolting on external stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-20 the Right Cylinder?
Choose this adjustable-stroke model when your machine setup requires variable end stops or product-size changeovers without swapping the entire cylinder or adding external stops. If you need less force, stepping down to an 80 mm bore yields 2513 N at 0.5 MPa; if your application demands more power, a 160 mm bore provides 10053 N. Because the 180 mm stroke is relatively short for this large bore, side-loading is less of a concern than with longer travels, but the robust 32 mm rod and M27x2 thread still handle substantial side loads.
When specifying a replacement, ensure you match the 125 mm bore, 180 mm stroke, 20 mm adjustment range, PT G1/2 port, and the desired mounting style. Remember that a plain SAIJ does not hold its load without live air pressure—the rear adjuster is a travel stop, not a lock. For true load-holding without continuous air, consider the 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 SAIJ125 Adjustable Cylinder SAIJ125AX180-20 FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum operating pressure of 1.0 MPa, it delivers up to 1251 kgf.
A rear stopper screw lets you mechanically shorten the 180 mm nominal stroke by up to 20 mm, creating a 160-180 mm usable travel window. This allows you to fine-tune the end position during setup without changing the cylinder itself.
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