Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 800mm 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
- Stroke800 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-40S
The AirTAC SAIJ125X800-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel window down to 760-800 mm without swapping out the unit. Delivering 6136 N of push force at 0.5 MPa, it is built for heavy-duty positioning tasks. The rod is crafted from SUS420J2 stainless steel (option A) for high durability against lateral stress, and the integrated magnet (-S) enables direct tracking via CMSE reed or DMSE solid-state sensors housed in the dual-side barrel grooves.
This model uses a PT tapered G1/2 port and relies on variable air cushions at both ends to manage deceleration over the long 800 mm stroke. The rear adjuster functions strictly as a mechanical stop to set the end position and is not a locking mechanism; it will not hold a load without continuous live air pressure. For true fail-safe load holding, an external rod lock or the related BSAI clamp-lock series should be specified.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 800 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 SAIJ125AX800-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×800 | 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 SAIJ125AX800-40S Is Used
Variable End-Stop Positioning
Dial in the 760-800 mm travel window on a heavy-duty conveyor diverter to accommodate varying package lengths without physically repositioning the cylinder mounts.
Machine Changeover
Use the 40 mm rear screw adjustment to quickly reset the end-of-stroke datum when switching a packaging line between different product sizes, drastically reducing setup downtime.
Heavy-Duty Press Tuning
Leverage the 6136 N push force and fine-tune the bottoming position during automated assembly press operations, ensuring precise contact force without mechanical alterations.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-40S the Right Cylinder?
Choose this 125 mm bore when your application requires more thrust than the 80 mm class (which provides 2513 N at 0.5 MPa) but does not demand the massive 10053 N output of the 160 mm variant. The 40 mm adjustment range is highly advantageous during machine commissioning or product changeover, allowing you to dial in the exact end-of-stroke position without adding external stopper blocks. To match this exact configuration, specify a 125 mm bore, 800 mm stroke, 40 mm adjustment, PT port thread, SUS420J2 rod material, and the -S magnet option for sensor readiness.
Because the nominal stroke is 800 mm, the long unsupported piston rod is susceptible to side-loading and sagging; an external guide rail must be used to prevent premature seal wear and binding. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, deliberately omitting the FB, CA, CB, and CR foot and pivot brackets to keep the footprint streamlined for adjustable setups. Operating speed is capped at 30-500 mm/s, specific to the larger bore sizes.
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 SAIJ125AX800-40S FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. It can deliver up to 11045 N of push force at 0.9 MPa.
The rear adjuster acts as a mechanical stop that allows you to shorten the effective travel from the nominal 800 mm down to 760 mm. This creates a 760-800 mm usable window for fine-tuning end positions during setup, though it does not lock the load without live air pressure.
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