Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 185mm 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
- Stroke185 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-20S
The AirTAC SAIJ125X185-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. It features a SUS420J2 stainless steel rod (code A) and PT tapered ports. By turning the rear screw, you achieve a 165-185mm usable travel window, perfect for fine-tuning the retract end position without swapping hardware.
This adjustable-stroke design saves setup time during product changeovers. The extruded aluminum barrel includes sensor grooves on both sides for CMSE reed and DMSE electronic switches. Remember that the rear adjuster functions strictly as a travel stop, not a lock; it cannot hold loads without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 185 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 SAIJ125AX185-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×185 | 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 SAIJ125AX185-20S Is Used
Changeover Calibration
Dial in the 165-185mm travel window instantly when switching product sizes on a packaging line, avoiding mechanical rebuilds.
Heavy Clamping
Provides 6136N of clamping force at 0.5 MPa while allowing precise retraction stops for delicate workpiece dimensions.
Assembly Positioning
Sets exact end-stops for large automotive component assembly, using the integrated CMSE / DMSE sensor grooves for confirmation.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-20S the Right Cylinder?
Choose this 125mm bore when a 100mm cylinder (providing 3927N push at 0.5 MPa) lacks the necessary thrust, but a 160mm bore is physically too large. The 20mm adjustment window is ideal for applications requiring precise end-position tuning during commissioning. If you need to hold a load without continuous air pressure, select the SAIL (air-released lock) or BSAI (clamp-lock) instead of relying on this adjuster.
To match this exact ISO 15552 replacement, specify: 125mm bore, 185mm stroke, 20mm adjustment, PT ports, SUS420J2 rod, and the -S magnet. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the stroke is under 300mm, side-load risks are lower, but external guides are still recommended for heavy 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 SAIJ125AX185-20S FAQ
At 0.5 MPa, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster acts as a stopper that lets you shorten the 185mm nominal stroke by up to 20mm, creating a 165-185mm travel window. It sets the end position but does not lock the load without air pressure.
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