Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-50S 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 SAIJ125X185-50S
The AirTAC SAIJ125X185-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 135 to 185 mm. Driven by a 125 mm bore, it delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa. The integrated magnet supports position sensing via AirTAC CMSE reed or DMSE electronic switches.
This adjustable-stroke design allows precise end-position tuning during commissioning without swapping hardware. The extruded aluminum barrel features sensor grooves on both sides, and the carbon steel rod with an M27x2 thread handles high side loads. The rear screw acts purely as a travel stop for deceleration, not a lock, meaning live air is required to maintain position.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-50S |
|---|---|
| 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 SAIJ125X185-50S
| 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 SAIJ125X185-50S Is Used
Variable End-Stop Positioning
Dial in the exact retraction point within the 135-185 mm window during machine setup, avoiding the need to physically swap out cylinders for different product lengths.
Heavy Clamping Force
Leverage 6136 N of push force at 0.5 MPa to secure heavy workpieces during machining, using the rear stopper to fine-tune the clamp depth precisely.
Product Changeover
Quickly adjust the stroke by up to 50 mm on packaging conveyors to handle varying carton sizes without altering the fixed mounting infrastructure.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-50S the Right Cylinder?
Choose this 125 mm bore when an application requires substantial thrust—stepping down to an 80 mm bore reduces push force to 2513 N at 0.5 MPa, while a 160 mm bore increases it to 10053 N. The 50 mm adjustment range is ideal for product changeovers on packaging lines, allowing operators to dial in the exact 135-185 mm travel distance. For applications needing dead-stop positioning without continuous air pressure, a standard SAIJ is insufficient; consider an AirTAC SAIL or BSAI locking cylinder instead.
Because the 185 mm stroke is below the 300 mm threshold, side-load stress is moderate, though the robust M27x2 rod thread still provides excellent mounting rigidity. To replace an ISO 15552 cylinder, match the 125 mm bore, 185 mm stroke, PT tapered port threads, and the desired mounting kit (Basic, FA, LB, TC, FTC, TCM1, or TCM2). The operating speed ranges from 30 to 500 mm/s.
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 SAIJ125X185-50S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw allows you to shorten the nominal 185 mm stroke by up to 50 mm, creating a usable travel window of 135 to 185 mm. This stopper only sets the travel end and does not lock the load without live air pressure.
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