Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-100 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 SAIJ125X185-100
The AirTAC SAIJ125X185-100 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N pull force at 0.5MPa, making it suited for heavy-duty positioning. The integrated rear stopper allows you to trim the nominal 185mm stroke back by up to 100mm, yielding a wide usable travel window of 85 to 185mm to accommodate varying material sizes without swapping hardware.
This model features a 32mm carbon steel piston rod and a PT G1/2 port. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches. It supports a reduced set of mounting interfaces—Basic, FA, LB, TC, FTC, TCM1, and TCM2—omitting the FB, CA, CB, and CR options found on some other series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-100 |
|---|---|
| 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 SAIJ125X185-100
| 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 SAIJ125X185-100 Is Used
Variable End-Stop Tuning
Dial in the exact retract distance for different product lengths, using the 85-185mm window to changeover a line without replacing the cylinder.
Heavy-Duty Positioning
Leverage the 6136N pull force at 0.5MPa to move heavy fixtures, using the rear screw to fine-tune the final resting position during machine setup.
Assembly Line Changeover
Quickly adjust the stroke end-point to accommodate new part dimensions on automated assembly machinery, reducing downtime between production runs.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-100 the Right Cylinder?
Select this 125mm bore cylinder when your application requires high thrust—stepping down to a 100mm bore yields only 3927N push force at 0.5MPa, whereas this SAIJ125X185-100 provides 6136N pull. The 100mm adjustment range is ideal for product changeovers on a line, allowing operators to fine-tune the retract end-position during commissioning rather than relying on fixed stops or swapping to a different SAI fixed-stroke unit.
When matching an ISO 15552 replacement, verify your bore, stroke, port thread (PT G1/2), and mounting accessory. Note that the rear adjuster acts strictly as a travel stop to set deceleration endpoints; it does not hold the load without live air pressure. For true load-holding, consider the SAIL or BSAI series. Operating speed for this 125mm bore is 30-500mm/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 SAIJ125X185-100 FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of pull force and 8590N at 0.7MPa. The maximum thrust is 1251 kgf at 1.0MPa.
The rear adjuster screw acts as a mechanical stop that can shorten the 185mm nominal stroke by up to 100mm, providing an adjustable travel window of 85 to 185mm. It sets the end position but does not lock the load without continuous air pressure.
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