Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-75 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 SAIJ125AX85-75
The AirTAC SAIJ125X85-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to dial back the nominal 85 mm travel by up to 75 mm. This creates a highly flexible usable travel window of 10 to 85 mm, letting you fine-tune the retract end position at commissioning without swapping out the barrel or adding external stops. It delivers a robust 6136 N push force (and 5734 N pull) at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
This variant is configured with a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of switches. The rear adjuster acts purely as a mechanical stop to set the travel end and deceleration alongside the variable air cushions; it does not hold the load without live air pressure, so a SAIL or BSAI lock is needed for drop prevention.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-75 |
|---|---|
| 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 SAIJ125AX85-75
| 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 SAIJ125AX85-75 Is Used
Adjustable Machine Stops
Dial in the exact retract position from 10 to 85 mm during setup or product changeover without changing the cylinder.
Heavy-Duty Positioning
Leverage 6136 N of thrust at 0.5 MPa to move and position heavy fixtures securely during manufacturing cycles.
Variable End-Stop Tuning
Use the rear screw stopper to fine-tune the travel end and deceleration alongside the air cushions for delicate operations.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-75 the Right Cylinder?
Choose this 125 mm bore when your application requires the 6136 N thrust at 0.5 MPa that smaller bores cannot provide, but you need on-the-fly end-position tuning for product changeovers. If your process requires less force, stepping down to an 80 mm bore yields 2513 N at 0.5 MPa. The adjustable stroke is ideal for variable end stops, but remember the adjuster is a stop, not a lock. For load-holding without live air pressure, consider an external rod lock or a SAIL pneumatic lock cylinder.
To match this ISO 15552 cylinder for a direct replacement, verify the 125 mm bore, 85 mm nominal stroke, 75 mm adjustment range, PT G1/2 port, and the SUS420J2 rod material. Because the nominal stroke is under 300 mm, side-load stress is minimal, but long unsupported loads should still use an external guide. The mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 accessories.
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 SAIJ125AX85-75 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 delivers up to 1251 kgf.
The rear adjuster screw lets you mechanically shorten the 85 mm nominal stroke by up to 75 mm, providing an adjustable travel window of 10 to 85 mm. The adjuster acts as a travel stop to set the end position and does not lock the load without live air pressure.
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