Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-20S 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 SAIJ125X210-20S
The AirTAC SAIJ125X210-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 210 mm travel by up to 20 mm. This creates a usable 190-210 mm end-position window, enabling precise fine-tuning at commissioning without swapping the unit or adding external stops. It delivers substantial thrust, providing 6136 N of push force and 5734 N of pull force at 0.5 MPa.
This -S variant includes a magnet for position sensing and is built with a standard carbon steel rod with an M27x2 thread. The extruded aluminum barrel features sensor grooves on both sides, directly supporting AirTAC CMSE reed and DMSE solid-state switches. Operating at 30-500 mm/s, it uses a PT tapered port and includes adjustable air cushions at both ends to manage deceleration.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-20S |
|---|---|
| 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 SAIJ125X210-20S
| 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 SAIJ125X210-20S Is Used
Product Changeover
Dial in the 190-210 mm travel window during line changeovers to accommodate slightly different package lengths without replacing the cylinder.
End-Stop Tuning
Fine-tune the exact retracted position during machine commissioning using the rear screw, avoiding the need to bolt on custom external spacers.
High-Force Positioning
Leverage the 6136 N push force to move heavy pallets or tooling, relying on the built-in air cushion to decelerate the 32 mm rod smoothly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-20S the Right Cylinder?
Choose this 125 mm bore when an application requires high force (up to 6136 N push at 0.5 MPa) within a 190-210 mm travel range. If your setup needs less force, stepping down to a 100 mm bore yields 3927 N of push force. The rear adjuster acts purely as a mechanical stop to set the travel end and does not hold the load without live air; for true load-holding without pressure, consider an SAIL pneumatic lock or BSAI clamp-lock cylinder.
As a dimensionally interchangeable ISO 15552 profile cylinder, it matches standard mounting footprints. The SAIJ series uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets. Ensure your setup specifies the 125 mm bore, 210 mm nominal stroke, 20 mm adjustment, PT port, and -S magnet.
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 SAIJ125X210-20S FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can reach up to 8590 N push at 0.7 MPa.
The rear adjuster screw lets you shorten the 210 mm nominal stroke by up to 20 mm, creating a 190-210 mm usable travel window. The adjuster functions as a travel stop and does not lock the load without live air pressure.
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