Airtac SAIJ125 Adjustable Cylinder SAIJ125BX650-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX650-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 650mm 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
- Stroke650 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 SAIJ125BX650-20
The AirTAC SAIJ125X650-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. It features a SUS304 stainless steel rod and PT tapered ports. By turning the rear screw, you achieve a usable travel window of 630 to 650 mm, allowing precise end-position tuning without swapping out the entire actuator.
This model utilizes an extruded aluminum barrel with sensor grooves on both sides, maintaining a true profile design rather than a tie-rod construction. The rear stopper mechanism acts solely as a travel limit and works in tandem with the standard variable air cushions to decelerate the load; it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX650-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX650-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 650 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 SAIJ125BX650-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×650 | 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 SAIJ125BX650-20 Is Used
Product Size Changeovers
Dial in the 630-650mm retraction stop during packaging line format changes to accommodate different carton lengths without changing the cylinder.
End-Position Calibration
Fine-tune the exact end-of-stroke position during machine commissioning to prevent crushing delicate workpieces with the 6136N thrust.
Adjustable Material Stops
Serve as an adjustable mechanical stop in heavy material handling, using the rear screw to set the precise 20mm travel window variance.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX650-20 the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (providing 3927N push at 0.5 MPa) lacks the necessary thrust, but a 160 mm bore (10053N) would be excessive. The 20 mm adjustment range is ideal for fine-tuning the retraction point during machine setup or product changeovers, avoiding the need to bolt on external stops. Because the nominal stroke is 650 mm, an external guide is recommended to manage side-load forces on the extended rod.
For an exact ISO 15552 replacement match, verify a 125 mm bore, 650 mm stroke, 20 mm adjustment range, PT port thread, and the desired mounting style. The SAIJ series supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR options. Remember that this cylinder requires continuous air pressure to hold a load; for pilot-operated locking needs, consider the SAIL or BSAI series.
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 SAIJ125BX650-20 FAQ
At 0.5 MPa operating pressure, this 125 mm 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 screw allows you to shorten the 650mm nominal stroke by up to 20mm, creating a 630-650mm usable travel window. It functions as a mechanical stop for position tuning and is not a locking device.
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