Robot Grippers: Types, Selection, Grip Force & Cost

Compare finger, vacuum, magnetic and soft robot grippers. Learn how to calculate grip force and assess safety, integration, costs and applications. The gripper determines whether a robot merely reaches a workpiece or masters the process reliably: it establishes product contact, transfers forces and confirms that the part has been picked up safely.

This guide explains the most important types of grippers, shows reliable selection criteria and translates technical data into a practical decision. It is aimed at production managers, designers, integrators and companies that want to automate pick-and-place, machine loading, assembly, packaging, palletizing or bin picking. A current market overview for grippers shows how large the selection now is. However, product filters based on price, payload and number of fingers are not enough to make a good investment decision: workpiece, process, environment, safety concept and total costs must be considered together.

Key points at a glance

There is no universally best robot gripper.The right design depends on geometry, material, surface, variety of variants, cycle time and consequences of failure.
The robot’s load capacity is not the gripping force.Gripper weight, adapter, center of gravity, acceleration, coefficient of friction and safety factor reduce the workpiece mass that can actually be controlled.
Finger and parallel grippers are precise and versatile, but require suitable contact surfaces and correctly designed gripping jaws.
Vacuum gripper are particularly suitable for flat products, boxes, metal sheets, glass and packaging. Leakage, porosity, contamination and energy requirements must be assessed.
Magnetic gripper can handle perforated or rough ferromagnetic workpieces, but are limited to suitable materials and require a concept of residual magnetism and power failure.
Soft and adaptive grippers mechanically compensate for shape deviations and are attractive for sensitive products. For this purpose, precision, service life and cleanability must be checked on an application-specific basis.
Sensor technology is not a comfort feature.Position, force, current, pressure, vacuum and presence signals enable process monitoring and reliable error reactions.
The best selection is made through experimentation.Real workpieces, unfavorable tolerances, maximum acceleration, dirty surfaces and errors belong in the acceptance test.

What is a robot gripper?

A robot gripper is aEnd effector, which picks up, holds, moves and releases workpieces. It sits on the robot’s tool flange and forms the physical interface to the product with gripping jaws, suction cups, magnets or flexible fingers. The complete gripping system often also includes an adapter plate, tool changer, valves, vacuum generator, sensors, lines, control and software.

In everyday life, the term gripper is often only used for mechanical two-finger systems. Technically, however, it includes significantly more principles: force-fitting gripping via friction, positive gripping, vacuum, magnetic force, needle gripping, adhesion or combinations thereof. Which method makes sense does not depend on the robot make, but rather on the gripping task.

Friction, form fit and adhesion

AtForce connection Frictional forces hold the workpiece. A parallel gripper, for example, presses two jaws against a component. AtPositive fit fingers surround a contour or reach into a hole; the geometry carries part of the load. Undercohesive or surface-acting principles In practice, vacuum, magnetic force and special adhesion processes are classified, among other things. Positive locking is often more robust against fluctuating coefficients of friction, but requires a suitable workpiece geometry.

What types of robot grippers are there?

Mechanical two-finger and parallel grippers

Parallel grippers move two jaws towards or away from each other. You can grip the outside or – if you have suitable fingers – stretch an inner contour. Their strengths are defined contact points, high repeatability, interchangeable gripping jaws and a wide range from small assembly components to heavy castings. The current oneParallel gripper portfolio from SCHUNK shows that pneumatic and electrical systems are available with different strokes, gripping forces, guides and protection types.

However, the gripper alone does not determine the process quality. Long fingers increase the moment at the guide and reduce the usable gripping force at the contact point. Narrow contact surfaces increase local pressure. Smooth jaws can slip on oily parts. Good gripping jaws therefore use contours, suitable coverings, stops and lever arms that are as short as possible.

Electric parallel gripper on an industrial robot handling a precision-machined metal component in a CNC cell [Image content created with AI] — A mechanical parallel gripper in CNC machine tending: finger geometry, friction and center of gravity determine process reliability.

Angular grippers

With angle grippers, the fingers pivot around joint points. This allows the gripper to be opened wide without requiring a long linear stroke. This is helpful for large parts or narrow, disruptive contours. However, the contact geometry and the force change over the opening angle. A parallel gripper is therefore often easier to design for precise centering and insertion tasks.

Three-finger and centric grippers

Three synchronously moved fingers center round components such as shafts, sleeves, blanks or turned parts. Interior and exterior handles are possible. A current product example is theOnRobot 3FG15 with manufacturer information about 150 millimeters of stroke, 10 to 240 Newton gripping force and up to 15 kilograms of payload. Such data is useful, but does not replace testing finger length, acceleration, workpiece surface and clamping depth.

Adaptive and underactuated grippers

Adaptive grippers have fingers or joints that conform to an object contour with fewer drives. This under-actuation reduces the programming and positioning effort: small position deviations are compensated for mechanically. The gripper can create both a parallel and a comprehensive grip in one movement. TheAdaptive gripper from Robotiq show typical areas of application in varied production, assembly and machine loading.

The advantage of adaptability has a downside. The exact position of the workpiece in the gripper can vary more than with positive, rigid jaws. Centering contours, additional sensors or a subsequent alignment step therefore make sense for high-precision joining.

Vacuum grippers and area gripping systems

Vacuum grippers create a pressure difference between the vacuum cleaner and the environment. They do not require side access and can accommodate thin, flat or delicate products. Typical applications include boxes, bags, sheets, glass, plastic panels, wood materials and packaging. At therobotic container unloading Vacuum is particularly common because boxes can often only be reached from the front.

The spectrum ranges from individual suction cups to suction spiders to zoned surface grippers. Schmalz describesSurface, layer and modular vacuum grippers for different geometries and materials. TheBin picker SBPG is designed, for example, for freely formed parts and the ability to reach into the box.

Vacuum is not automatically universal. Porous surfaces, leaks, wrinkles, dust, oil, moisture and damaged packaging alter the holding power. A large vacuum cleaner is less able to seal a curved surface than several small ones. During rapid pivoting movements, lateral forces and tilting moments must be taken into account. For safety-critical loads, check valves, accumulators, vacuum switches and a controlled reaction to pressure drops are important.

Robot with a zoned vacuum gripper lifting cardboard boxes in an automated packaging and palletizing cell [Image content created with AI] — Vacuum grippers need sufficiently airtight contact surfaces and reserves for leakage, acceleration and tilting moments. [Image content created with AI]

Magnetic gripper

Magnetic grippers are suitable for ferromagnetic workpieces. They also work on perforated, dusty or slightly uneven surfaces that vacuums have difficulty on. Electropermanent magnets can maintain their holding force after a switching pulse without a permanent supply of energy. TheOnRobot MG10 According to the manufacturer, it combines adjustable magnetic force, part recognition and holding in the event of a power failure.

The limits are clear: aluminum, austenitic stainless steel, plastics, wood and many composite materials cannot be gripped magnetically. Thin sheets can accidentally be picked up twice. Coatings, air gaps and material thickness affect holding force. In addition, residual magnetism, chip adhesion and possible influences on sensitive components must be evaluated.

Soft grippers and compliant fingers

Soft grippers use elastic fingers, flexible membranes or compliant structures. They distribute contact pressure and adapt to irregular shapes. This makes them suitable for fruit, baked goods, bags, cosmetic products, sensitive plastics or unsorted consumer goods. Their mechanical flexibility is a form of body-based intelligence: not every small deviation has to be precisely calculated by the camera and controls.

Hygiene, cleaning chemicals, temperature, material fatigue and the availability of replacement fingers are important for the selection. A soft gripper can hold a product gently but be less rigid during high accelerations or precise assembly. Actual lifespan must be validated with real products and cleaning cycles.

Compliant soft gripper gently handling a ripe tomato in hygienic food processing [Image content created with AI] — Soft grippers distribute contact pressure and mechanically compensate for variations in shape. [Image content created with AI]

Needle grippers, clamping grippers and specialized principles

Needle grippers penetrate porous or textile materials with fine needles. They are used, for example, for fabrics, fiber composites, foams or insulation material. Clamp and hook grippers use defined edges or openings. Adhesion grippers based on the gecko principle can hold smooth parts with low operating energy. These principles are often superior for special applications, but their workpiece compatibility and process limits are narrower than with standard grippers.

Hybrid gripper and tool changer

Hybrid grippers, for example, combine fingers and vacuum or magnet and mechanical security. This allows different product states to be covered or loads to be kept redundant. Tool changers take a different approach: the robot switches between multiple specialized end effectors. The international standardISO 11593:2022 unifies the terms for automatic end effector changing systems.

A change concept increases flexibility, but adds mass, length, couplings and additional fault points to the flange. It is particularly worthwhile if a universal gripper would only meet the requirements with major compromises.

Gripper types in direct comparison

Gripper principle	Particularly suitable for	Strengths	Typical boundaries
Parallel/finger grippers	Defined components, machine loading, assembly	Precise, robust jaws, inside and outside handle possible	Requires contact surfaces and side accessibility
Three-finger gripper	Round parts, shafts, sleeves, turned parts	Self-centering, stable round handle	Larger installation space, less ideal for flat parts
Adaptive gripper	Varied parts, high mix/low volume	Compensates for tolerances, fewer jaw changes	Workpiece position can vary, higher complexity
Vacuum gripper	Cardboard boxes, plates, sheets, glass, packaging	Access from one side, low height possible	Leakage, porosity, contamination, compressed air requirement
Magnetic gripper	Ferromagnetic sheets and workpieces	Even perforated or rough surfaces, compact	Material dependent, double sheet metal and residual magnetism
Soft gripper	Delicate, changing and organic shapes	Gentle, adaptable, tolerance-friendly	Limited stiffness, material aging, cleaning
Needle/special gripper	Textiles, foam, composite layers, special parts	High process reliability in the right material	Narrow range of applications, possible product traces

The twelve most important selection criteria

1. Workpiece geometry and permissible contact zones

CAD model, tolerances and center of gravity are just the beginning. What matters is where the gripper can actually start. Visible surfaces, sealing edges, threads, thin walls or areas that are still warm can be taboo. Check the smallest and largest variants as well as deformed, misoriented and partially hidden parts.

2. Material, surface and coefficient of friction

Steel, aluminum, cardboard, glass, plastic, rubber and food react differently. Oil reduces friction, dust degrades seals, rough surfaces increase vacuum leakage, soft packaging deforms. The coefficient of friction should not be taken from a general table, but rather measured with real workpiece and jaw materials.

3. Mass, center of gravity and inertia

The nominal workpiece mass says little about dynamic loads. A long object creates high moments on the robot flange and the gripper guides. Offset of the center of gravity, acceleration and abrupt braking affect robots, tool changers, grippers and contact points. Therefore, check the load diagrams of the robot and the entire tool structure.

4. Gripping force and holding force

The gripping force must be derived from the specific movement. For a vertical, frictional grip with two opposing fingers, a simplified estimate can be:

F_Finger ≥ S × m × (g + a) / (2 × μ)

There isF_Fingerthe required normal force per finger,Sthe safety factor,mthe workpiece mass,gthe acceleration of gravity,athe worst case additional acceleration andμthe coefficient of friction. Attention: Manufacturers define “grip force” differently – sometimes per jaw, sometimes as a total. The reference position and finger length must match the data sheet.

5. Stroke, opening width and accessibility

The gripper must safely move around the largest part and hold the smallest with sufficient reserve. A large stroke increases variant flexibility, but can increase size, mass and cycle time. In boxes, machines or shelves it is often not the opening width that is crucial, but rather the outer disruptive contour.

6. Repeatability and workpiece position

A high finger repeat accuracy does not guarantee a precise workpiece position. Elastic coverings, adaptive joints, inaccurate raw parts and changing contact points create additional deviations. When pressing in, joining or equipping, positive jaws, centering stations or camera-assisted position correction make sense.

7. Cycle time and dynamics

Opening and closing times are only part of the cycle. Pressure build-up, vacuum evacuation, part recognition, blowing off, gripping and tool changing also count. A lightweight gripper enables higher robot accelerations. A double gripper can reduce machine change times, but increases mass and disruptive contours.

8. Environment and protection class

Coolant, chips, dust, moisture, cleaning agents, temperature, ESD or clean room requirements affect seals, guides, sensors and electronics. Protection ratings such as IP67 are only meaningful if cables, connectors and customer-specific fingers can also tolerate the environment. Suitable materials and a hygienic design are required for food contact.

9. Energy and media supply

Pneumatic grippers are compact and fast, but require compressed air, valves and hoses. Electric grippers offer programmable position, speed and force, but require appropriate communication and electrical power. Vacuum can be generated pneumatically or electrically. Evaluate not only the connection value, but also the consumption in real cycle including leakage and blow-off pulses.

10. Sensor technology and diagnosis

A binary signal “gripper closed” is rarely sufficient for varied production. Finger position, motor current, gripping force, vacuum level, pressure, workpiece presence, temperature and error codes are valuable. A force-torque sensor can also detect contact, tilting and joining forces. ModernityPhysical AI systems particularly benefit from such contact data because image data alone does not confirm a stable grip.

11. Mechanical and software integration

Check flange pattern, adapter, tool center, allowable moments, cable routing and hose routing. On the software side, this includes digital inputs/outputs, IO-Link, fieldbus, manufacturer-specific plugins, PLC blocks, ROS 2 support and diagnostic access. Plug-and-play reduces integration time, but may tie the project more closely to an ecosystem. Open interfaces are an advantage with long system life cycles.

12. Total costs instead of purchase price

The purchase price is just one item. There are also gripping jaws, adapters, tool changers, valves, vacuum generators, hoses, cables, programming, risk assessment, spare parts and commissioning. During operation, costs arise from compressed air, wear, cleaning, conversion and downtime. A more expensive gripper can be more economical if it shortens variant changes or detects errors earlier.

Size the vacuum gripper correctly

The theoretical holding force of a vacuum cleaner can be estimated simply:

F_Halten = Δp × A × η

Δpis the pressure difference,Athe effective suction surface andηan application-related efficiency for seal, surface and losses. In practice, the required holding force, including the safety factor, must be greater than weight, acceleration forces and possible tipping or shear loads.

An example: With a pressure difference of 60 kilopascals and an effective area of 20 square centimeters, the theoretical force is 120 Newtons. This ideal value must not be used directly as a permissible payload. Leakage, lateral movement, uneven load distribution and a partially occupied vacuum cleaner can significantly reduce the reserve. For porous boxes, a higher volume flow is often more important than a maximum negative pressure.

Why gripper weight and center of gravity are often underestimated

The effective payload is not simply “robot payload minus workpiece”. The tool includes grippers, fingers, adapters, changers, sensors, cables and, if necessary, valves. Additionally, the robot’s load diagram limits the permissible combination of mass and center of gravity distance.

A 2.5 kilogram gripper on a 5 kilogram cobot theoretically leaves only 2.5 kilograms for the adapter and workpiece. If the center of gravity is far in front of the flange, the dynamic permissible load can be even lower. This has a direct impact on cycle time, braking distance and service life. Lightweight construction is therefore not an end in itself, but rather creates usable load capacity and dynamics.

Sensor technology: From open control loop to monitored gripping process

A gripper without feedback executes a command. A sensor-based gripper confirms whether the result is plausible. Typical levels are:

End position sensors:report open or closed, but do not always recognize a correctly held part.
Position measurement:allows variant control and can detect duplicate parts or incorrect dimensions.
Motor current or pressure:serves as an indirect indication of strength and blockage.
Vacuum switch:monitor negative pressure and leakage.
Part recognition:confirms the presence of the workpiece regardless of finger position.
Force/torque sensors:detects contact, tilting, joining forces and collisions.
Tactile and slip sensors:can detect local pressure distribution and the beginning of slipping.

What is important is not the number of sensors, but the reaction to their signals. The control requires limit values, time monitoring and defined restart strategies. If the vacuum is unstable, the robot can, for example, put the part down in a controlled manner instead of continuing the movement.

Safety: The gripper belongs to the complete robot application

A cobot does not automatically make a sharp-edged or jammed gripper collaborative. Crushing points between fingers, workpiece and environment, protruding screws, falling loads, stored pneumatic energy and unexpected opening must be taken into account in the risk assessment.

The current oneISO 10218-1:2025 covers safety requirements for industrial robots. For the integration, commissioning, operation and maintenance of complete applicationsISO 10218-2:2025 decisive. Contains specific instructions for the safe design and integration of end effectorsISO/TR 20218-1:2018. The specific conformity assessment must be carried out by qualified experts based on the system actually used.

Practical protective measures can include:

positive or redundant load securing at dangerous fall heights,
check valves and vacuum accumulators,
self-locking or de-energized gripping mechanisms,
rounded gripper geometries and limited finger forces,
monitored speeds and safe spaces,
Workpiece presence and gripping force monitoring,
Defined safe states in the event of a power or communication failure.

Select robot gripper according to application

Application	Nearby grabbers	Check especially
Pick and place defined parts	Parallel gripper, vacuum	Cycle time, repeatability, part recognition
CNC machine loading	Parallel, three-finger or magnetic grippers	Coolant, chips, centering, double gripper
I’m picking	Narrow finger grippers, flexible vacuum grippers	Interfering contours, hidden handles, risk of collision
Packaging and palletizing	Vacuum, surface or electric palletizing grippers	Cardboard quality, leakage, zones, energy consumption
Delicate foods	Soft grippers, hygienic vacuum grippers	Contact material, cleaning, pressure points
Sheet metal handling	Magnet or vacuum	Double sheet metal, oil, perforation, residual magnetism
Precision assembly	Electric parallel gripper with sensors	Position, force, jaw play, joint compensation
High mix/low volume	Adaptive gripper or tool changer	Changeover time, software, variant coverage

This is how a professional gripper selection works

Step 1: Describe the workpiece family instead of a sample part

Record dimensions, mass, tolerances, center of gravity, material, temperature, surface condition and permitted contact zones for all variants. Pick up damaged or dirty border patterns. A single ideal pattern almost always leads to an overly optimistic selection.

Step 2: Define process movement

Document the pick-up and storage position, speed, acceleration, rotation positions, available approach directions and interference contours. Consider whether the robot only needs to transport the part or hold it during machining, joining or testing.

Step 3: Evaluate the consequences of errors

What happens if you lose your grip? A falling empty box has a different risk class than a sharp piece of metal above a workstation. The sequence of errors determines the safety factor, sensors, redundancy and permissible speed.

Step 4: Compare two to three gripping principles

Don’t commit to a technology too early. For example, compare parallel gripper, vacuum and magnet using the same criteria. A weighted decision matrix prevents a low purchase price from masking important process risks.

Step 5: Lay out the entire system

Calculate gripping force, vacuum area, moments, effective robot load and energy requirements. Lay out fingers, vacuum cleaners, adapters, sensors, valves, cables and software together. Check whether standard components are available or custom parts need to be manufactured.

Step 6: Test with boundary samples

The test should contain minimum and maximum workpieces, worst surface, highest acceleration, dirty gripping surfaces, media failure and restart. Measure missteps, cycle time, part damage and process capability over enough repetitions.

Step 7: Record acceptance criteria in writing

Define measurable goals: success rate, maximum cycle time, permissible pressure point, position deviation, leakage limit, changeover time and maintenance interval. “Grabs reliably” is not an acceptable criterion.

Costs and profitability

A reliable profitability calculation separates one-off and ongoing costs:

Investment:Grippers, fingers, adapters, changers, valves, sensors and controls.
Engineering:Design, simulation, programming, safety and commissioning.
Operation:Electricity, compressed air, filters, vacuum cleaners, coverings, lubrication and cleaning.
Variant change:Standstill, jaw change, parameterization and renewed release.
Quality:Rejects, surface damage, double handles and rework.
Availability:Spare parts time, maintenance access and diagnostic capability.

An example: An inexpensive pneumatic gripper can be optimal for a stable mass process. In varied production, a programmable electric gripper can be cheaper despite a higher purchase price if jaw changes are no longer necessary and incorrect inserts are detected via position data. Conversely, additional intelligence is uneconomical if a simple positive jaw already solves the process robustly.

Typical errors when selecting a gripper

The robot load capacity is equated with the permissible workpiece mass.
Gripping strength is evaluated without coefficient of friction, acceleration and finger length.
Only the ideal workpiece is tested.
The gripper partially fits, but not through the machine opening.
Vacuum is selected without considering leakage and energy.
A magnetic gripper does not take double sheet metal or residual magnetism into account.
Sensors provide data, but the PLC has no error strategy.
Custom fingers are designed too late.
Protection class and materials are only tested for the gripper body, not for the entire system.
The purchase price eliminates conversion, maintenance and downtime costs.

Future of robot grippers: more data, less rigid special technology

Robot grippers are developing from simple actuators into measuring and software-integrated tools. Position, force, vacuum, slip and part presence are not only monitored but stored as process data. This enables predictive maintenance, automatic parameterization and better error analysis.

At the same time, the importance of adaptable mechanics is growing. Underactuated fingers, soft grippers and additive manufacturing of customer-specific contact surfaces reduce the effort required to accurately model each workpiece. With AI-supported manipulation, the greatest benefit comes from the interaction of vision, grip planning, force control and tactile feedback. Good gripper mechanics remain indispensable: software cannot optimize away missing friction or an unsuitable contact surface.

Robot gripper FAQ

Which robot gripper is the best?

The best gripper is the one that controls the entire workpiece family in the real process with sufficient safety reserve, cycle performance and availability. A parallel gripper can be optimal for defined metal parts, a vacuum gripper for boxes and a soft gripper for sensitive foods.

How much gripping force does a robot gripper need?

The required gripping force depends on mass, acceleration, coefficient of friction, gripping direction, number of fingers and safety factor. Manufacturer information must also be checked to see whether it applies per finger or as a total force and for which finger length it is specified.

What is the difference between grip force and payload?

Gripping force is the force with which fingers or jaws act on the workpiece. Payload refers to the mass that a gripper or robot can handle under defined conditions. A high gripping force does not automatically mean a high permissible payload because moments, center of gravity, friction and dynamics limit.

Are electric grippers better than pneumatic ones?

Electric grippers often offer programmable position, speed, force and diagnostics. Pneumatic grippers are often compact, fast and robust. Which variant is more economical depends on the cycle, variants, available compressed air, controllability and maintenance.

When does a vacuum gripper make sense?

Vacuum is particularly attractive when a workpiece is only accessible from one side or has a large surface area. Surface, porosity, leakage, direction of movement and compressed air or energy requirements must be checked.

Can one gripper handle several different workpieces?

Yes. Large strokes, adaptive fingers, exchangeable jaws, zoned vacuum surfaces or tool changers increase the variant coverage. The more universal the gripper becomes, the more precisely precision, interference contours, weight and cycle time should be checked.

Is a gripper on a cobot automatically safe?

No. Security depends on the complete application. Gripper fingers, workpiece edges, pinch points, speed, force, possible drop heights and error reactions must be taken into account in the risk assessment.

Which interfaces should a modern gripper have?

What is required at least is an electrical or pneumatic connection suitable for the control and clear status signals. Position and force parameters, error diagnostics, fieldbus or IO-Link as well as well-supported robot and PLC components are valuable for flexible applications.

Conclusion: The gripper is selected based on the process

Robotic grippers should not be chosen based on the flashiest spec sheet value or the lowest price. The robust solution is created from the workpiece family, movement profile, contact physics, sensors, safety and life cycle costs. Mechanical fingers offer precision, vacuum enables one-sided access, magnetic grippers master difficult steel surfaces and soft grippers protect sensitive products. Adaptive systems and tool changers create flexibility, but increase integration and validation effort.

The most important procurement rule is therefore: first define borderline cases, then compare gripping principles, then test with real workpieces. Anyone who designs grippers, robots, sensors and processes as a system not only receives a functioning demonstrator, but also reliable automation.

Sources and further information

Bewerte den Beitrag hier!

[Total: 0 Average: 0]

Nico Nuss

Website

Author Nico Nuss has been working on mobile computing and automation software since 2001. Drawing on his experience and strong interest in future technologies, he focuses on robotics and AI.