Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 400mm 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
- Stroke400 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-75S
The AirTAC SAIJ125X400-75-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 6136N push force at 0.5MPa and provides a usable travel window of 325-400mm, letting you trim the nominal 400mm stroke by up to 75mm during commissioning. The SUS420J2 stainless steel rod (code A) offers high corrosion resistance, and the built-in magnet supports CMSE reed and DMSE electronic sensors.
This 125mm bore unit uses PT tapered G1/2 ports and includes adjustable air cushions at both ends to manage kinetic energy. The rear stopper acts solely as a travel end-position setter, not a load lock, so live air is always required to hold a load. It uses the standard SAIJ mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 400 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 SAIJ125AX400-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×400 | 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 SAIJ125AX400-75S Is Used
Variable End-Stop Positioning
Dial in the exact retraction point within the 325-400mm window during machine setup, perfect for accommodating different material thicknesses without mechanical rebuilds.
Product Changeover Diverter
Quickly alter the stroke on a sorting line to handle varying package sizes, using the rear adjuster to set new reject distances on the fly.
Heavy Assembly Press
Leverage the 6136N thrust at 0.5MPa to seat heavy components, fine-tuning the final press depth by up to 75mm to ensure perfect assembly tolerances.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-75S the Right Cylinder?
Choose this 125mm bore cylinder when an 80mm bore (2513N push at 0.5MPa) lacks thrust, but a 160mm bore (10053N) is physically oversized. The 75mm adjustment range is ideal for product changeovers on packaging lines, allowing variable end-stops without swapping the cylinder or adding external stops. For fixed-position tasks without tuning needs, a standard SAI cylinder suffices.
Because the 400mm stroke is substantial, the 32mm rod diameter requires external guiding to prevent excessive side-loading on the seals. If your application requires holding a load without continuous air pressure, use an external pilot-operated check valve or select an AirTAC SAIL or BSAI locking cylinder. This -S variant is dimensionally interchangeable per ISO 15552 and uses PT ports.
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 SAIJ125AX400-75S FAQ
At 0.5MPa, it provides 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The rear adjuster screw lets you shorten the effective travel from the nominal 400mm down to 325mm. This mechanical stopper sets the end position but does not lock the load without live air pressure.
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