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What is the default opening capability of the 2F85 and 2F140?

Adjustable opening range by rotating fingers for enhanced reach

Context

Robotiq’s 2F grippers are designed with flexible finger mounting options to adapt to various part sizes and geometries. In addition to their standard stroke, both the 2F85 and 2F140 grippers offer an alternative finger orientation that increases the total opening range—without requiring hardware changes.

This article explains the default opening capabilities for both models and how rotating the fingers 180° can extend their reach.

 

Opening Ranges

2F85 Gripper

  • Default configuration:

    • Opening range: 0–85 mm

  • Fingers rotated 180°:

    • Opening range: 40–125 mm

 

2F140 Gripper

  • Default configuration:

    • Opening range: 0–140 mm

  • Fingers rotated 180°:

    • Opening range: 40–180 mm

 

 

When to Use Finger Rotation

Rotating the fingers 180° allows for:

  • Handling larger parts without custom fingertips

  • Reducing gripper obstruction in confined spaces

  • Increasing the overall opening span while keeping the stroke length the same

Note: Rotating the fingers changes the mechanical leverage point and may affect grip force and payload behavior.

 

How to Rotate the Fingers

  1. Power off the robot or disconnect the gripper.

  2. Using a 2 mm Allen key, remove the screws holding both fingers.

  3. Rotate each finger 180° relative to the mounting axis.

  4. Reinstall the screws with Loctite 248 or appropriate threadlocker.

  5. Tighten to a torque of approximately 2–3 N·m.

  6. Power on and reinitialize the gripper from the robot interface.

  7. Test opening and closing to confirm proper movement.

 

Design and Safety Notes

  • Always power off before performing mechanical changes.

  • Finger rotation shifts the grip zone outward—ensure proper alignment and clearance.

  • Do not exceed the rated payload or torque limits.

  • After modifying finger positions, verify operation and recalibrate gripping positions in your program

Conclusion

Both the 2F85 and 2F140 grippers support alternate finger orientations that expand their opening ranges by 40 mm. This simple adjustment allows for greater flexibility without requiring new parts. Be sure to test grip performance after any mechanical change and consult specifications to stay within safe operating parameters.