Airtac SAIJ125 Adjustable Cylinder SAIJ125BX70-10
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX70-10 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 70mm 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
- Stroke70 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 SAIJ125BX70-10
The AirTAC SAIJ125X70-10 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the nominal 70 mm travel back by up to 10 mm. This creates a precise 60-70 mm usable travel window, enabling fine end-position tuning at commissioning without swapping out the unit or adding external stops. Delivering 6136 N of push force at 0.5 MPa, it is built for heavy-duty positioning tasks.
This variant is equipped with a SUS304 stainless steel rod (option B) for superior corrosion resistance and features a PT tapered port thread. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches. The rear adjuster acts purely as a mechanical stop to set the travel end and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX70-10 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX70-10 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 70 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 SAIJ125BX70-10
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×70 | 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 SAIJ125BX70-10 Is Used
Machine Changeover Setup
Dial in the 60-70 mm travel window during product size transitions to set new end positions rapidly without disassembling the pneumatic line.
Heavy Press Positioning
Leverage the 6136 N push force at 0.5 MPa to seat large components accurately, using the rear stopper to fine-tune the final contact point.
Variable End-Stop Actuation
Adjust the retract position on the fly for automated assembly lines where the exact end-of-stroke location must be tweaked between production runs.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX70-10 the Right Cylinder?
Choose this 125 mm bore when you need substantial thrust—6136 N at 0.5 MPa—that exceeds the 3927 N push capacity of the 100 mm bore size. The adjustable stroke is ideal for machine setups requiring variable end stops or product-size changeovers, offering more flexibility than a fixed-stroke SAI cylinder. If your application requires the load to be held mechanically without continuous air pressure, you must add an external rod lock or pilot-operated check valve, or switch to a SAIL or BSAI cylinder, as the SAIJ adjuster is not a brake.
For ISO 15552 replacement matching, verify the 125 mm bore, 70 mm nominal stroke, 10 mm adjustment range, PT port thread, and the SUS304 (B) rod material. Because the standard speed range for this 125 mm bore is 30-500 mm/s, ensure your flow controls are properly dialed in to prevent end-of-stroke impact.
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 SAIJ125BX70-10 FAQ
It features a rear adjusting screw that allows you to shorten the effective stroke by up to 10 mm. This provides a usable travel window of 60 to 70 mm, letting you fine-tune the end position without changing the cylinder itself.
At a 0.5 MPa operating pressure, this 125 mm bore cylinder generates a push force of 6136 N and a pull force of 5734 N. It can deliver up to 1251 kgf at its maximum 1.0 MPa pressure rating.
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