Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-100 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 SAIJ125AX375-100
The AirTAC SAIJ125X375-100 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear mechanical stroke adjuster. With a 375 mm nominal stroke and a 100 mm adjustment range, it provides a highly flexible 275-375 mm usable travel window. This allows you to dial in the exact retract end position at commissioning without swapping the cylinder or adding external stops. It delivers robust thrust, pushing 6136 N and pulling 5734 N at 0.5 MPa.
Built with a SUS420J2 stainless steel piston rod (material code A), this 125 mm bore unit handles demanding environments while resisting corrosion. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE solid-state switches, though this specific SKU is configured without a magnet. The rear adjuster acts purely as a travel stop to fine-tune deceleration, not as a load-holding lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-100 |
|---|---|
| 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 SAIJ125AX375-100
| 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 SAIJ125AX375-100 Is Used
Variable End-Stop Machining
Dial in the exact 275-375 mm retract position for machining operations that require frequent adjustments to accommodate different raw material lengths without changing tooling.
Product Changeover Diverter
Rapidly reconfigure a conveyor sorting diverter during product size changeovers by turning the rear adjuster, saving downtime compared to physically remounting a fixed cylinder.
Assembly Press Calibration
Fine-tune the end-of-stroke position on a heavy assembly press during commissioning, ensuring precise contact force without relying on external mechanical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-100 the Right Cylinder?
Choose this 125 mm bore cylinder when an application requires substantial force—6136 N push at 0.5 MPa—combined with variable end-position tuning. If your setup only needs 4523 N of push force, stepping down to the 80 mm bore reduces air consumption and physical footprint. Conversely, if you need over 10053 N, the 160 mm bore is the next step up. The 100 mm adjustment range here is ideal for machinery that processes varying product sizes, letting operators change the retract stop on the fly instead of installing a fixed-stroke SAI cylinder.
Because the 375 mm stroke is relatively long, ensure adequate side-load support by using an external guide rail to prevent rod binding. Remember that the rear adjuster and air cushions only set the travel end; they do not hold the load without live air pressure. For true fail-safe load holding, select the SAIL air-released lock, the BSAI clamp-lock, or an external rod lock. This PT-threaded model is dimensionally interchangeable per ISO 15552 and supports the SAIJ mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125AX375-100 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 375 mm nominal stroke by up to 100 mm, creating a 275-375 mm usable travel window. It fine-tunes the end position and deceleration, but it is not a lock and will not hold the load without continuous air pressure.
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