Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-50 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 SAIJ125AX85-50
The AirTAC SAIJ125X85-50 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a usable travel window of 35 to 85 mm, allowing you to dial back the nominal 85 mm stroke by up to 50 mm during commissioning. Delivering 6136 N of push force at 0.5 MPa, it handles heavy-duty positioning tasks with ease. The standard extruded aluminum barrel features sensor grooves on both sides, though no magnet is installed on this unit.
This model features a SUS420J2 stainless steel rod (option A) for improved corrosion resistance and uses a PT tapered port thread. The rear adjuster acts purely as a mechanical stop to fine-tune the end position without needing external blocks, but it does not hold the load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-50 |
|---|---|
| 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 SAIJ125AX85-50
| 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 SAIJ125AX85-50 Is Used
Variable End Stops
Dial in the exact retraction point between 35 and 85 mm for multi-format machining fixtures without changing hardware.
Machine Changeover
Quickly adapt heavy-duty press or clamp positions during product size transitions using the 50 mm rear adjuster.
Assembly Line Tuning
Fine-tune the final end-position of heavy 6136 N push operations during initial commissioning to prevent impact damage.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-50 the Right Cylinder?
Choose this 125 mm bore when 80 mm (2513 N at 0.5 MPa) is insufficient but stepping up to 160 mm (10053 N) would be overkill. An adjustable stroke is essential here for product changeovers, letting you shift the end-stop by up to 50 mm rather than swapping out the entire cylinder. To replace this ISO 15552 cylinder, match the 125 mm bore, 85 mm stroke, 50 mm adjustment, PT G1/2 port, and standard mounting options (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the stroke is under 300 mm, side-load risks are moderate, but the 32 mm rod and M27x2 thread provide excellent rigidity for offset loads.
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 SAIJ125AX85-50 FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. It can reach up to 11045 N push at 0.9 MPa.
The rear adjuster screw lets you mechanically shorten the 85 mm stroke down to as little as 35 mm. This provides a 35-85 mm usable travel window for fine-tuning end positions without swapping the cylinder.
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