Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 350mm 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
- Stroke350 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-75S
The AirTAC SAIJ125X350-75-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 350 mm stroke that can be fine-tuned backward by up to 75 mm, yielding a highly flexible 275-350 mm usable travel window. Delivering 6136 N of push force at 0.5 MPa, it is built with a SUS420J2 stainless steel rod (option A) and includes a magnet for position sensing.
This model utilizes PT tapered ports and operates at speeds of 30-500 mm/s. The extruded aluminum barrel incorporates sensor grooves on both sides, allowing you to mount CMSE reed or DMSE electronic switches exactly where needed. Because the rear adjuster acts purely as a mechanical stop and does not lock the load, you must maintain live air pressure during operation or integrate an external locking device for static holding.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 350 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 SAIJ125AX350-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×350 | 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 SAIJ125AX350-75S Is Used
Variable End-Stop Machining
Dial in the exact 275-350 mm clamping depth on machining fixtures during product changeovers without swapping out the entire actuator.
Product Diversion Setup
Adjust the rear stopper to modify the push-off distance for varying package sizes on a packaging line, ensuring precise routing.
Long-Stroke Assembly Pressing
Leverage the 6136 N thrust at 0.5 MPa for pressing components, fine-tuning the final 75 mm of travel to accommodate different assembly heights.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-75S the Right Cylinder?
Selecting this 125 mm bore cylinder makes sense when your machine commissioning requires exact end-position tuning without fabricating external stopper blocks. If your application needs less force, stepping down to a 100 mm bore yields 3927 N push force at 0.5 MPa; stepping up to a 160 mm bore provides 10053 N. For a drop-in ISO 15552 replacement, match the 125 mm bore, 350 mm stroke, PT ports, and the -S magnet requirement.
With a 350 mm stroke, the 32 mm diameter rod and M27x2 rod thread provide substantial rigidity, but the extended travel length means you should use an external guide to prevent excessive side-loading. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, deliberately omitting FB, CA, CB, and CR brackets. For load-holding without continuous air pressure, consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder instead of relying on the adjuster.
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 SAIJ125AX350-75S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At its maximum 1.0 MPa pressure, it achieves a push force of 1251 kgf.
The rear adjusting screw lets you shorten the effective travel from the nominal 350 mm down to 275 mm. This creates a 275-350 mm setup window for fine-tuning the retract end position at commissioning without adding external stops.
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