Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 40mm 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
- Stroke40 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-30S
The AirTAC SAIJ125X40-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling precise end-position tuning during commissioning. Based on a 125mm bore and a 40mm nominal stroke, the external screw stopper provides a 30mm adjustment range, yielding a versatile 10-40mm usable travel window for exact product changeovers. This robust profile design delivers 6136N of thrust at 0.5 MPa.
This specific SKU ships with a SUS420J2 stainless steel rod (code A) for superior corrosion resistance and includes a magnet (-S) for electronic DMSE solid-state or CMSE reed sensors. The standard SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, intentionally omitting FB, CA, CB, and CR brackets. Fluid must be filtered to 40 um, and the extruded aluminum barrel integrates sensor grooves on both sides for flexible switch placement.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 40 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 SAIJ125AX40-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×40 | 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 SAIJ125AX40-30S Is Used
Machine Changeover
Dial in the 10-40mm travel window during product size transitions to set new end-stops without physically replacing the cylinder.
End-Position Tuning
Fine-tune the retract stroke at commissioning to absorb mechanical tolerances and achieve precise final positioning.
Heavy Assembly Press
Leverage the 6136N push force at 0.5 MPa for high-load pressing operations while adjusting the stroke to protect the workpiece.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX40-30S the Right Cylinder?
Choose this 125mm bore when your application requires substantial thrust—stepping down to an 80mm bore drops the 0.5 MPa push force to 2513N. The adjustable stroke is ideal for machine setups requiring variable end-stops without swapping hardware, but note that the rear adjuster acts only as a travel stop and does not hold the load without live air. For position-holding without pressure, select an SAIL or BSAI cylinder instead.
When replacing an ISO 15552 cylinder, match these exact attributes: 125mm bore, 40mm nominal stroke with a 30mm adjustment range, PT tapered port threads, and the -S magnet option. Because the stroke is under 300mm, side-load stress is minimal, but the 32mm rod and M27x2 rod thread still handle high axial loads efficiently within the 30-500 mm/s speed range.
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 SAIJ125AX40-30S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw allows you to trim the 40mm nominal stroke by up to 30mm, creating a usable travel window of 10-40mm. This stopper only decelerates and sets the travel end; it does not lock or hold the load without continuous air pressure.
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