Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 375mm 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
- Stroke375 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-75S
The AirTAC SAIJ125X375-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 300 to 375 mm. Delivering 6136 N of push force at 0.5 MPa, it handles heavy-duty positioning with precision. The integrated -S magnet enables position feedback via CMSE reed or DMSE electronic solid-state sensors mounted in the dual-side barrel grooves.
This unit features a SUS420J2 stainless steel rod for superior corrosion resistance and carries PT tapered port threads. The rear mechanical stopper lets you fine-tune the retract end-position at commissioning without adding external stops, while the robust 32 mm rod and M27x2 thread handle high side loads. Remember that the adjuster acts only as a travel stop, not a lock, so live air is required to maintain position.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 375 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 SAIJ125AX375-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×375 | 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 SAIJ125AX375-75S Is Used
Product Changeover Lines
Dial in the 300-375 mm travel window during format changeovers to accommodate different product sizes without physically replacing the cylinder.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or fixtures, using the rear stopper to fine-tune the final resting position.
Commissioning Calibration
Adjust the end-stop during initial machine setup to perfect the stroke length mechanically, avoiding the need for reprogramming complex motion controllers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-75S the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder (providing 2513 N push at 0.5 MPa) lacks the thrust for your application, but a 160 mm bore (10053 N) would be excessive. The 75 mm adjustment range is ideal for product-size changeovers on a line, allowing you to dial in the exact end-stop mechanically rather than swapping out a fixed-stroke SAI cylinder. Because the nominal stroke is 375 mm, ensure adequate external guiding to prevent excessive side-loading on the rod.
For a direct ISO 15552 replacement match, verify a 125 mm bore, 375 mm nominal stroke, 75 mm adjustment range, PT ports, and the -S magnet option. If your application requires the load to be held mechanically without live air pressure, select a SAIL pneumatic lock or BSAI clamp-lock cylinder instead, as the SAIJ rear adjuster cannot hold a load.
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 SAIJ125AX375-75S FAQ
The rear adjuster acts as a mechanical stop that lets you trim the effective stroke by up to 75 mm. This creates a usable travel window of 300 to 375 mm, allowing you to set the exact retract position without changing the cylinder.
At 0.5 MPa it provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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