Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-40S 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 SAIJ125AX375-40S
The AirTAC SAIJ125X375-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers 6136N of push force and 5734N of pull force at 0.5 MPa, making it suited for heavy-duty actuation. The integrated adjuster allows you to trim the effective travel back by up to 40 mm, creating a precise 335-375 mm usable stroke window for exact end-position tuning during commissioning.
This variant includes a SUS420J2 stainless steel rod (option A) for enhanced corrosion resistance and features a built-in magnet (-S) for use with AirTAC CMSE reed and DMSE electronic solid-state sensors. The extruded aluminum barrel includes sensor grooves on both sides, and the standard PT tapered ports are paired with adjustable air cushions at both ends to manage deceleration.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-40S |
|---|---|
| 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 SAIJ125AX375-40S
| 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 SAIJ125AX375-40S Is Used
Product Changeover
Dial in the 335-375 mm travel window during line changeovers to accommodate different product lengths without replacing the actuator.
Heavy Positioning
Leverage the 6136N push force to move heavy jigs into place while fine-tuning the final end-stop at commissioning.
Sensor-Driven Stops
Use the integrated magnet with DMSE electronic sensors to confirm intermediate positions within the adjustable travel range.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX375-40S the Right Cylinder?
Choose this 125 mm bore when 0.5 MPa output around 6136N is required; step down to a 100 mm bore (3927N) for lighter loads or up to a 160 mm bore (10053N) for heavier demands. An adjustable stroke is ideal for machine setups requiring variable end-stops or product changeovers without swapping cylinders, unlike a fixed-stroke SAI model. At 375 mm stroke, the 32 mm rod diameter handles side loads well, but an external guide is still recommended for unsupported loads.
The rear adjuster acts strictly as a mechanical travel stop and deceleration aid, not a load-holding lock; the cylinder cannot hold position without live air. For drop-prevention or fail-safe holding, select an SAIL (air-released lock) or BSAI (clamp-lock) cylinder. This SAIJ model uses the reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and is dimensionally interchangeable per ISO 15552.
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 SAIJ125AX375-40S FAQ
The rear adjusting screw acts as an external stopper that lets you shorten the effective stroke by up to 40 mm, providing a usable travel window of 335 to 375 mm. It allows fine end-position tuning without adding external stops or changing the cylinder.
At an operating pressure of 0.5 MPa, the SAIJ125X375-40-S generates a push force of 6136N and a pull force of 5734N. It can achieve a maximum push force of 11045N at 0.9 MPa.
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