Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-50 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 SAIJ125X185-50
The AirTAC SAIJ125X185-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 135-185 mm, allowing you to dial back the nominal 185 mm stroke by up to 50 mm during machine commissioning. This bore size generates a substantial 6136 N push force at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches. The standard carbon steel rod features an M27x2 thread, and the unit uses PT tapered port threads (G1/2). Unlike a fixed-stroke SAI cylinder, this model lets you fine-tune the retract end-position without swapping the entire actuator.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-50 |
|---|---|
| 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 SAIJ125X185-50
| 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 SAIJ125X185-50 Is Used
Product Size Changeovers
Quickly adapt machinery to different product lengths by dialing the stroke back up to 50 mm, eliminating the need to physically swap cylinders during line changeovers.
Heavy-Duty End Tuning
Leverage the 6136 N push force at 0.5 MPa while precisely setting the retract end-position during initial machine commissioning to prevent mechanical interference.
Variable Assembly Stops
Provide adjustable physical stops for varying assembly depths on the production floor without installing separate external stopper blocks on the equipment frame.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-50 the Right Cylinder?
Choose this 125 mm bore actuator when your application requires high thrust but variable end-stop positioning. If your setup needs less force, stepping down to an 80 mm bore yields 2513 N of push force at 0.5 MPa. If you require more power, a 160 mm bore provides 10053 N. The 50 mm adjustment range is ideal for product-size changeovers on a line, letting you reposition the end-stop without adding external mechanical stops.
For ISO 15552 replacement matching, ensure you specify the 125 mm bore, 185 mm stroke, 50 mm adjustment range, PT port threads, and the required mounting accessory from the SAIJ set: Basic, FA, LB, TC, FTC, TCM1, or TCM2. Because the 185 mm stroke is relatively short for this bore, side-load stress is minimal, but an external guide is still recommended for heavy loads. Remember, the rear adjuster is a travel stop, not a lock; for load-holding without live air, consider the SAIL or BSAI series.
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 SAIJ125X185-50 FAQ
It features a rear adjuster screw that acts as a mechanical stop, allowing you to shorten the effective travel from 185 mm down to a minimum of 135 mm. This provides a 50 mm tuning window to fine-tune the retract end position without changing the cylinder.
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder generates a push force of 6136 N and a pull force of 5734 N. It can deliver up to 1251 kgf at its maximum rated pressure of 1.0 MPa.
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