Airtac SAIJ125 Adjustable Cylinder SAIJ125BX210-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX210-75 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 SAIJ125BX210-75
The AirTAC SAIJ125X210-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 135 to 210 mm usable travel window. Delivering 8590 N of push force at 0.7 MPa, it handles heavy payloads with a 32 mm SUS304 stainless steel rod and M27x2 rod thread. The PT tapered port threads ensure a high-pressure pneumatic seal at the G1/2 connection.
This adjustable-stroke design allows you to fine-tune the retract end position at commissioning without swapping the cylinder or adding external stops. The extruded aluminum barrel includes sensor grooves on both sides for mounting CMSE reed or DMSE electronic switches, while the rear screw acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX210-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX210-75 |
|---|---|
| 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 SAIJ125BX210-75
| 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 SAIJ125BX210-75 Is Used
Variable End-Stop Tuning
Dial in the exact retract position from 135 to 210 mm during machine commissioning to accommodate different product sizes without mechanical rework.
Heavy Payload Positioning
Leverage the 8590 N push force at 0.7 MPa to move heavy assemblies, using the rear screw to precisely set the retraction limit.
Product Line Changeover
Quickly adjust the travel window for new part runs on a conveyor line, using the 75 mm trim range to avoid repositioning the entire cylinder assembly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX210-75 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (5497 N push at 0.7 MPa) is insufficient for your load, or step down if you need less mass in motion. An adjustable stroke is ideal for product changeovers on a line, letting you dial in the exact end-stop on the fly versus a fixed-stroke SAI cylinder. For load-holding without continuous air pressure, select a SAIL or BSAI series instead, as the SAIJ adjuster is not a lock.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 210 mm nominal stroke, 75 mm adjustment range, PT port threads, and the Basic, FA, LB, TC, FTC, TCM1, or TCM2 mounting interface. Since the 210 mm stroke is under the 300 mm side-load threshold, standard mounting is adequate, though long unsupported loads should still use 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 SAIJ125BX210-75 FAQ
At 0.7 MPa operating pressure, this 125 mm bore cylinder provides 8590 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it delivers 1251 kgf of push force.
The rear adjuster screw lets you shorten the nominal 210 mm stroke by up to 75 mm, creating a usable travel window of 135 to 210 mm. This stopper only sets the end position and decelerates the travel; it does not lock or hold the load without live air pressure.
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