Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-10S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-10S 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 SAIJ125AX400-10S
The AirTAC SAIJ125X400-10-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and provides a usable travel window of 390-400 mm, letting you dial back the nominal 400 mm stroke by up to 10 mm. The SUS420J2 stainless steel rod offers high corrosion resistance, while the integrated magnet enables position detection.
Unlike fixed-stroke alternatives, this rear screw stopper allows precise end-position tuning during commissioning without adding external stops. The extruded aluminum barrel includes sensor grooves on both sides for flexible CMSE reed or DMSE electronic switch mounting. Remember that the adjuster acts only as a travel stop, not a load lock, so it will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-10S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-10S |
|---|---|
| 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 SAIJ125AX400-10S
| 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 SAIJ125AX400-10S Is Used
Machine Setup Changeover
Fine-tune the 390-400 mm travel window during product line changeovers to accommodate varying package sizes without swapping cylinders.
Variable End-Stop Positioning
Dial in the exact retraction point for sorting arms or diverter gates on a conveyor, ensuring precise physical stops without external hardware.
Heavy-Duty Actuation
Leverage the 6136N push force at 0.5 MPa for large press or clamping operations, using the rear adjuster to compensate for mechanical wear over time.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-10S the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927N push at 0.5 MPa) lacks sufficient thrust, but a 160 mm bore (10053N) would be excessive. The adjustable 390-400 mm travel window is ideal for machine setups requiring variable end-stops or product-size changeovers. Because the 400 mm stroke is substantial, the 32 mm rod diameter handles significant side loads, though an external guide is still recommended for heavy unsupported loads.
To replace an ISO 15552 cylinder, match the 125 mm bore, 400 mm stroke, 10 mm adjustment range, PT tapered port threads, and the -S magnet option. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2. If your application requires true position holding without live air, consider the SAIL or BSAI locking cylinders instead.
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 SAIJ125AX400-10S FAQ
The rear adjuster acts as a mechanical stop that shortens the effective stroke. For the SAIJ125X400-10-S, you can trim the 400 mm nominal stroke back by up to 10 mm, giving a usable travel window of 390-400 mm. Note that this adjuster is a stop, not a lock, and will not hold the load without continuous air pressure.
At 0.5 MPa, the 125 mm bore provides 6136N of push force and 5734N of pull force. The -S option includes a magnet compatible with AirTAC CMSE reed switches and DMSE electronic sensors, which mount directly into the dual-side sensor grooves on the extruded aluminum barrel.
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