Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-20 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 SAIJ125X185-20
The AirTAC SAIJ125X185-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering a robust 6136N push force at 0.5 MPa. By turning the external rear stopper, you can fine-tune the effective travel window down to 165 mm from the 185 mm nominal stroke without adding external stops. The extruded aluminum barrel features sensor grooves on both sides for flexible mounting of CMSE or DMSE switches.
This 125 mm bore variant uses a PT tapered port thread and a 32 mm carbon steel rod with an M27x2 male thread. The generous rod diameter handles higher side loads, though long unsupported strokes still require an external guide. SAIJ supports a reduced mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-20 |
|---|---|
| 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 SAIJ125X185-20
| 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 SAIJ125X185-20 Is Used
End-Position Tuning
Dial in the exact retract stop within the 165-185 mm window during machine commissioning without swapping cylinders.
Product Changeover
Quickly adjust the stroke length on a packaging line when handling a new carton size or varying material heights.
Heavy Forming Stops
Set a precise mechanical stop for high-force pressing or clamping tasks requiring 6136N of thrust at 0.5 MPa.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-20 the Right Cylinder?
Choose this 125 mm bore when your application requires the 6136N thrust at 0.5 MPa, stepping up from a 100 mm bore that provides 3927N. An adjustable stroke is selected over a fixed SAI when you need precise end-position tuning at commissioning or during product changeovers. The rear adjuster acts purely as a travel stop and does not hold the load without live air; for true load-holding, select the SAIL or BSAI series.
When replacing an ISO 15552 cylinder, verify the 125 mm bore, 185 mm stroke, 20 mm adjustment range, PT port thread, and the specific mounting bracket. Because the stroke is under 300 mm, side-load concerns are moderate, but the heavy 32 mm rod still benefits from external guiding on high-offset 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 SAIJ125X185-20 FAQ
The external rear screw stopper lets you shorten the effective stroke by up to 20 mm, providing a usable travel window of 165-185 mm. It acts as a mechanical stop to set the end position and is not a lock that holds the load without air pressure.
At 0.5 MPa it provides 6136N of push force and 5734N of pull force. At 0.7 MPa the push force increases to 8590N.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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