Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 85mm 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
- Stroke85 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-40
The AirTAC SAIJ125X85-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136 N push force at 0.5 MPa. It features a 125 mm bore, a PT G1/2 port, and an 85 mm nominal stroke that can be fine-tuned down by up to 40 mm, creating a precise 45-85 mm usable travel window. This adjustability allows you to dial in the retract end position during commissioning without swapping hardware.
This variant uses a SUS420J2 stainless steel rod (material code A) for superior corrosion resistance and carries a 32 mm rod diameter with an M27x2 thread to handle high side loads. It supports speeds of 30-500 mm/s and includes adjustable air cushions at both ends to decelerate heavy loads smoothly.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 85 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 SAIJ125AX85-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×85 | 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 SAIJ125AX85-40 Is Used
Machine Changeover
Rapidly adapt end-stops when switching product sizes on a packaging line, utilizing the 45-85 mm travel window to avoid mechanical rebuilds.
Position Tuning
Fine-tune the retract position during initial commissioning to achieve exact alignment without fabricating custom external stopper blocks.
Heavy Forming
Leverage the 6136 N push force at 0.5 MPa for pressing or holding tasks where the exact end-position needs slight in-field calibration.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-40 the Right Cylinder?
Choose this 125 mm bore cylinder when an 80 mm bore (providing 2513 N push at 0.5 MPa) lacks the thrust for your application, but you need on-the-fly end-position tuning. The -40 adjustment code is ideal for product changeovers, letting you shorten the stroke by up to 40 mm via the rear stopper instead of adding external shims. Because the nominal stroke is under 300 mm, external side-load guides are less critical than on longer strokes, though the robust 32 mm rod still provides excellent rigidity.
To match this ISO 15552 dimensionally interchangeable cylinder, confirm the 125 mm bore, 85 mm stroke, PT G1/2 port, and your mounting choice from the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that the rear adjuster acts only as a travel stop and does not hold the load without live air; for true load-holding without pressure, consider the SAIL or BSAI series.
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 SAIJ125AX85-40 FAQ
It features a rear adjusting screw that acts as a mechanical stopper, allowing you to shorten the effective stroke by up to 40 mm. This creates a usable travel window of 45-85 mm, enabling fine-tuning of the end position without changing the cylinder.
At a 0.5 MPa operating pressure, the SAIJ125X85-40 provides 6136 N of push force and 5734 N of pull force. It can reach a maximum push force of 11045 N at 0.9 MPa.
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