Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-50 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 SAIJ125AX210-50
The AirTAC SAIJ125X210-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 6136N of push force at 0.5 MPa and provides a usable travel window of 160 to 210mm, letting you trim up to 50mm of the nominal stroke during machine setup.
This 125mm bore actuator uses a PT G1/2 port and a SUS420J2 stainless steel rod. The rear stopper sets the retract end position without needing external stops, but it is a travel stop rather than a load lock. For position holding without live air, consider SAIL or BSAI models.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-50 |
|---|---|
| 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 SAIJ125AX210-50
| 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 SAIJ125AX210-50 Is Used
Product Changeover
Dial in the 160-210mm travel window on the fly when switching product sizes on a packaging line, eliminating the need to swap physical cylinders.
Machine Setup
Fine-tune the retract end-position during commissioning to dial in exact stopping points without machining external hard stops.
Variable End Stops
Adjust the stroke dynamically for processes requiring slight positional variations within the 50mm adjustment range.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX210-50 the Right Cylinder?
Choose this adjustable-stroke model when your application requires variable end-stops or frequent product changeovers, avoiding the need to physically swap out a fixed-stroke SAI cylinder. If your force requirements are lower, stepping down to a 100mm bore yields 3927N of push force at 0.5 MPa.
To replace an ISO 15552 cylinder, match the 125mm bore, 210mm stroke, 50mm adjustment, PT G1/2 port, and the Basic, FA, LB, TC, FTC, TCM1, or TCM2 mounting set. At 210mm of travel, the 32mm rod handles side loads well, but long unsupported strokes still require an external guide.
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 SAIJ125AX210-50 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster acts as a stopper that lets you shorten the effective stroke by up to 50mm, creating a 160-210mm usable travel window. It only sets the travel end and does not hold the load without live air pressure.
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