How to choose a cobot gripper without sacrificing payload
On a cobot, the gripper competes with the part for payload. Here is how to think about gripper weight, force and flexibility so the robot spends its kilograms where they matter.
By Servo-Flex Engineering, Application Engineering
Every cobot spec sheet leads with one number: payload. What the spec sheet doesn't say is that your gripper eats into it first. Choose the wrong tool and a 10 kg cobot becomes a 4 kg cobot before it has touched a single part.
Payload is a budget, and the gripper spends first
Think of payload as a budget:
| Heavy gripper | Servo-Flex Flexi 100 | |
|---|---|---|
| Robot rated payload | 10 kg | 10 kg |
| Gripper weight | 6 kg | 2 kg |
| Usable for the part | 4 kg | 8 kg |
Same robot. Twice the usable payload. A lighter gripper isn't a nice-to-have — it's the difference between handling a part or buying a bigger robot.
Don't trade weight for force
The usual fear is that a light gripper must be a weak gripper. That isn't true of modern servo-electric designs. The Flexi 100 weighs 2 kg yet delivers up to 5 kN per jaw across three force levels — enough to handle parts many times its own weight.
Flexibility is the second hidden spec
Cobots are bought for flexibility, then often crippled by rigid tooling that needs a jaw change for every new part. A gripper that covers 6–120 mm with one configuration keeps the cobot as flexible as it was meant to be — no swaps, no re-teach between sizes.
A short checklist for cobot grippers
- Weight: every kilogram of gripper is a kilogram off the part. Aim low.
- Force and range: confirm it covers your full diameter range and weight at an acceptable force level.
- Actuation: electric avoids routing air along a collaborative arm.
- Safety on power loss: a mechanical hold means the part isn't dropped if power is cut.
- Feedback: clear visual cues (such as Servo-Flex's blue LEDs) help operators in a shared space.
The takeaway
Pick the gripper the way you'd pick a backpack for a long hike: as light as possible for the job it has to do. On a cobot, weight is payload, and payload is what you paid for.
See how much payload you'd recover with the ROI calculator, or book a demo on your own parts.