Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-50 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 SAIJ125AX180-50
The AirTAC SAIJ125X180-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 130 to 180 mm, allowing you to dial back the nominal 180 mm stroke by up to 50 mm during commissioning without adding external stops. Delivering 6136 N of pull force at 0.5 MPa, it is built for heavy-duty positioning tasks.
This variant uses a SUS420J2 stainless steel rod (material code A) for superior corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, and operating speeds are capped at 30-500 mm/s. The rear adjuster acts purely as a mechanical stop to set the end position and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-50 |
|---|---|
| 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 SAIJ125AX180-50
| 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 SAIJ125AX180-50 Is Used
Machine Setup & Changeover
Fine-tune the 130-180 mm travel window during line changeovers to accommodate varying product lengths without replacing the cylinder.
Variable End-Stop Tuning
Use the 50 mm rear adjuster to precisely set the retract end-position for different tooling offsets during initial commissioning.
Heavy-Duty Positioning
Leverage the 6136 N pull force to push or position heavy assemblies, relying on the rear stop to set the exact resting distance.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX180-50 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3681 N pull at 0.5 MPa) is insufficient, but an 80 mm bore is far too small. The adjustable 130-180 mm window is ideal for product changeovers or fine-tuning end positions on the fly, avoiding the need to swap out a fixed-stroke SAI cylinder. For any load-holding requirements without continuous air pressure, select the SAIL or BSAI series instead, as this cylinder lacks a mechanical lock.
When matching ISO 15552 dimensions, specify a 125 mm bore, 180 mm stroke, 50 mm adjustment range, PT G1/2 port, and your required mounting from the SAIJ set: Basic, FA, LB, TC, FTC, TCM1, or TCM2. Because the 180 mm stroke is relatively short for this large bore, side-load concerns are minimal, but an external guide is still recommended for heavy lateral loads.
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 SAIJ125AX180-50 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of pull force and 8590 N of push force. At the maximum 1.0 MPa, it delivers up to 1251 kgf.
The rear adjuster acts as a mechanical stop that shortens the effective travel from the nominal 180 mm down to as little as 130 mm. It sets the end position but does not lock or hold the load without continuous air pressure.
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