Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-50S 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 SAIJ125X210-50S
The AirTAC SAIJ125X210-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 160-210mm usable travel window, allowing you to dial back the 210mm nominal stroke by up to 50mm during commissioning. With a 125mm bore, it generates 6136N of push force at 0.5 MPa and 8590N at 0.7 MPa, making it suited for heavy-duty positioning tasks.
This unit includes a standard carbon steel rod and a PT tapered port thread (G1/2). The integrated magnet (-S) supports position sensing via CMSE reed or DMSE electronic switches fitted into the dual-side sensor grooves. The rear stopper functions strictly as an end-position stop, not a load lock, so live air pressure is required to maintain position.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-50S |
|---|---|
| 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 SAIJ125X210-50S
| 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 SAIJ125X210-50S Is Used
Machine Changeover
Dial in the exact 160-210mm end-stop during product size transitions on automated assembly lines without swapping hardware.
Variable End-Stop Tuning
Fine-tune the retract position at commissioning to perfect timing and mechanical alignment without machining external stops.
Heavy Load Positioning
Leverage the 6136N push force at 0.5 MPa to shift heavy pallets or fixtures, relying on the rear screw for final position trimming.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-50S the Right Cylinder?
Select this 125mm bore model when your application requires substantial thrust—such as 6136N at 0.5 MPa—combined with on-the-fly end-position tuning without swapping cylinders or adding external stops. If your process requires less force, stepping down to a 100mm bore yields 3927N at 0.5 MPa, whereas moving up to a 160mm bore provides 10053N. The 50mm adjustment window is ideal for accommodating product size changeovers on a production line.
For ISO 15552 replacement matching, ensure you specify the 125mm bore, 210mm stroke, 50mm adjustment range, PT port thread, and the -S magnet option. Note that SAIJ utilizes a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting FB, CA, CB, and CR brackets. Because the 210mm stroke is relatively long, an external guide rail is recommended to prevent excessive side-loading on the 32mm rod.
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 SAIJ125X210-50S FAQ
At 0.5 MPa, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. If operating pressure is increased to 0.7 MPa, the push force rises to 8590N.
The rear adjuster screw allows you to trim the effective travel back by up to 50mm from the 210mm nominal stroke, creating a 160-210mm usable window. The adjuster acts as a travel stop and does not lock the load without live air pressure.
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