Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 210mm 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
- Stroke210 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-50
The AirTAC SAIJ125X210-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 160 to 210 mm, letting you dial back the nominal 210 mm stroke by up to 50 mm during commissioning. This bore size delivers a robust 6136 N push force at 0.5 MPa, making it suited for heavy-duty positioning tasks.
The extruded aluminum barrel includes sensor grooves on both sides for CMSE reed or DMSE solid-state switches if a magnet is added later. It uses a PT tapered port and a 32 mm carbon steel rod. The rear adjuster acts purely as a travel stop for end-position tuning and does not lock the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 210 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 SAIJ125X210-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×210 | 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 SAIJ125X210-50 Is Used
Variable End-Stop Setup
Fine-tune the retraction point anywhere between 160 and 210 mm during machine commissioning to achieve perfect positioning without adding external stopper blocks.
Product Changeover
Quickly adapt the stroke length on automated lines when processing different material sizes, using the 50 mm adjustment range to bypass mechanical rework.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa for moving substantial jigs or fixtures, relying on the 32 mm rod to handle inherent operational loads.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-50 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N push at 0.5 MPa) lacks sufficient thrust, but a 160 mm bore (10053 N at 0.5 MPa) would be excessive. An adjustable stroke is selected over a fixed SAI cylinder when a machine requires fine end-position tuning or frequent product-size changeovers without swapping hardware. For load-holding without continuous air, use an external rod lock or pilot-operated check valve, as the rear adjuster only sets the travel end.
To match this ISO 15552 interchangeable cylinder, specify a 125 mm bore, 210 mm stroke, 50 mm adjustment range, PT port thread, and standard carbon steel rod. Because the total stroke is 210 mm, ensure an external guide supports any heavy loads to prevent side-load wear on the rod and seals.
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 SAIJ125X210-50 FAQ
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective travel from 210 mm down to a minimum of 160 mm. This provides a 50 mm tuning window for precise end-position setup without altering the cylinder mounting.
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 reach a maximum push force of 11045 N at 0.9 MPa.
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