Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-50 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 SAIJ125X85-50
The AirTAC SAIJ125X85-50 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa, making it suited for heavy-duty positioning tasks. By integrating an external adjusting screw at the rear, this specific SKU 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 without swapping out the unit.
This adjuster functions strictly as a mechanical stop for end-position tuning and works in tandem with the standard variable air cushions at both ends to manage deceleration. It is not a locking mechanism and requires continuous live air to hold a load. The extruded aluminum barrel features sensor grooves on both sides, and while this configuration omits a magnet, adding the -S option enables compatibility with AirTAC CMSE reed and DMSE electronic solid-state sensors.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-50 |
|---|---|
| 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 SAIJ125X85-50
| 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 SAIJ125X85-50 Is Used
Product Size Changeovers
Quickly reconfigure the stroke length by up to 50 mm on packaging lines handling varying container sizes, minimizing downtime between production runs.
Machine Setup Calibration
Fine-tune the retract end-position during commissioning to perfectly align heavy 125 mm bore clamping forces without adding external mechanical stops.
Variable End-Stop Positioning
Dial in the exact 35 to 85 mm travel window required for delicate material forming operations where over-travel could damage the workpiece.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X85-50 the Right Cylinder?
Selecting this 125 mm bore cylinder makes sense when your application requires substantial thrust—such as the 6136N push or 5734N pull at 0.5 MPa—but demands flexibility in the final end-stop position. If your setup only needs a fixed 85 mm travel without commissioning adjustments, the standard SAI fixed-stroke cylinder is a simpler alternative. Conversely, if you need to drop to a smaller footprint, an 80 mm bore provides 2513N push force at 0.5 MPa. For load-holding without live air pressure, this plain SAIJ is insufficient; you should look toward the SAIL air-released lock or BSAI clamp-lock cylinders, or employ an external pilot-operated check valve.
To match this exact ISO 15552 interchangeable footprint, confirm a 125 mm bore, 85 mm nominal stroke, 50 mm adjustment range, PT tapered port threads, and standard carbon steel rod material. Mounting choices are restricted to the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets. Because the stroke is under 300 mm, side-load concerns are minimal, but the robust 32 mm rod and M27x2 thread handle substantial off-center loads better than smaller bores.
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 SAIJ125X85-50 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136N of push force and 5734N of pull force. If you increase the pressure to 0.7 MPa, the push force rises to 8590N.
The rear adjusting screw acts as a mechanical stopper that lets you trim the effective stroke back from the 85 mm nominal length by up to 50 mm, creating a usable travel window of 35 to 85 mm. It only sets the end position and does not lock the load without live air.
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