Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 150mm 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
- Stroke150 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-20
The AirTAC SAIJ125X150-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 130-150 mm, allowing you to dial back the nominal 150 mm stroke by up to 20 mm during commissioning. This bore size delivers a robust 6136 N push force at 0.5 MPa, making it ideal for heavy-duty positioning tasks.
The extruded aluminum barrel incorporates sensor grooves on both sides for flexible switch mounting. This specific configuration features a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and PT tapered port threads. The rear adjuster acts purely as a mechanical stop to fine-tune the end position and cannot hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 150 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 SAIJ125AX150-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×150 | 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 SAIJ125AX150-20 Is Used
Machine Changeover
Dial in the 130-150 mm travel window during product size changeovers to set new end positions rapidly without mechanical hardware swaps.
Heavy Fixture Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy machining fixtures, using the rear stop for final placement tuning.
Commissioning Calibration
Fine-tune the retract end-position during initial machine setup, compensating for mechanical tolerances by trimming up to 20 mm of travel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-20 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N at 0.5 MPa) lacks the necessary thrust for your heavier fixtures. The adjustable stroke is selected over a fixed SAI model when you need variable end-stops for product changeovers without swapping the cylinder or adding external stops. For load-holding without continuous air pressure, you must use an external rod lock or pilot-operated check valve, as the SAIJ rear adjuster is a travel stop, not a brake. To replicate this ISO 15552 mounting interface, match the 125 mm bore, 150 mm stroke, 20 mm adjustment, PT G1/2 port, and your required mounting hardware.
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 SAIJ125AX150-20 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can reach up to 11045 N push force at 0.9 MPa.
The rear adjusting screw acts as a mechanical stop that lets you shorten the effective stroke from 150 mm down to a minimum of 130 mm. This creates a 130-150 mm adjustable travel window for fine-tuning the end position without replacing the cylinder.
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