Airtac SAIJ125 Adjustable Cylinder SAIJ125BX210-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX210-40S 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
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX210-40S
The AirTAC SAIJ125X210-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that permits a 170-210 mm usable travel window. It delivers 6136 N of pull force at 0.5 MPa and reaches a maximum of 1251 kgf at 1.0 MPa. The extruded aluminum barrel includes sensor grooves on both sides for straightforward position detection.
This variant is equipped with a SUS304 stainless steel rod for superior corrosion resistance and a PT tapered port thread. It supports speeds of 30-500 mm/s and uses adjustable air cushions at both ends to manage impact. The rear stopper mechanism allows precise end-position tuning during commissioning without adding external physical stops.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX210-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX210-40S |
|---|---|
| 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 SAIJ125BX210-40S
| 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 SAIJ125BX210-40S Is Used
Machining Clamp Positioning
Dial in the exact 170-210 mm clamping distance on machining fixtures to accommodate varying part tolerances without machining new stop blocks.
Product Diversion Changeover
Adjust the retract stopper on a packaging line diverter to handle different carton sizes rapidly during product changeover.
Heavy Assembly Press
Leverage the 1251 kgf maximum thrust for pressing operations while fine-tuning the end-of-stroke contact point to prevent tool damage.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX210-40S the Right Cylinder?
Select this 125 mm bore actuator when an application requires heavy thrust but exact final positioning needs field calibration. If 6136 N of pull at 0.5 MPa is excessive, stepping down to a 100 mm bore yields 3681 N; conversely, a 160 mm bore provides 9425 N. The adjustable 170-210 mm window is ideal for product changeovers on a line.
Remember that the rear adjuster functions strictly as a travel stop and does not hold the load without live air pressure. For fail-safe load-holding, consider an AirTAC SAIL or BSAI cylinder. To match this ISO 15552 footprint, specify a 125 mm bore, 210 mm nominal stroke, 40 mm adjustment, PT G1/2 port, Basic/FA/LB/TC/FTC/TCM1/TCM2 mounts, and the -S magnet for CMSE/DMSE sensors.
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 SAIJ125BX210-40S FAQ
At 0.5 MPa it provides 6136 N of pull force and 8590 N of push force. At the maximum operating pressure of 1.0 MPa, it reaches 1251 kgf.
The rear adjuster screw lets you shorten the 210 mm nominal stroke by up to 40 mm, creating a 170-210 mm travel window. This allows precise end-position tuning at commissioning without swapping the cylinder.
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