Industrial Robot End Effectors and Grippers Guide

Start With the Part, Not the Gripper Catalog

Industrial robot end effectors and grippers are the interface between a reprogrammable arm and a real part. The part itself — its weight, surface, geometry, tolerance, and how it presents — decides the gripper class. The International Federation of Robotics defines the industrial robot as a reprogrammable multipurpose manipulator, and the gripper is what makes that definition useful on your specific SKU.

The four common end-of-arm-tool (EOAT) classes are pneumatic parallel grippers, servo-electric adaptive grippers such as the Robotiq 2F-85, 2F-140, and 3-Finger line, vacuum systems from vendors like Piab and SMC, and magnetic grippers for ferrous parts. Welding cells add a torch package such as a Fronius or Abicor Binzel unit.

The Bot Scout rule is: describe the part in one line — material, mass, contact surfaces, orientation as presented — before opening any vendor page. Half of returned EOATs are grippers bought against a generic part description that the actual line never produced.

Bakery lines push this hardest because dough consistency shifts between batches, which is why our bakery robot picks lead on washdown rating.

Pneumatic Parallel Grippers: Cheapest per Cycle, Fussy About Air

Pneumatic parallel grippers dominate high-volume industrial cells because they are cheap, fast, and mechanically simple. SMC, Schunk, and Festo each publish full catalogs with force, stroke, mass, and repeatability figures pulled from the datasheet — always work from the datasheet, not a distributor page.

The failure mode is boring: dirty or wet compressed air shortens seal life, and a single-force setting means the gripper cannot distinguish a good part from a jammed one. If the line runs mixed SKUs or the part is fragile, the calculus shifts toward an electric adaptive gripper even though the per-unit price is higher.

Pneumatic remains the default for machine tending on stamped or machined parts where cycle time is under two seconds and the part presentation is fixed. It is the wrong default for cobot cells because it adds an air drop, a solenoid, and a valve manifold to what was supposed to be a single-cable installation.

Adaptive Electric Grippers: Robotiq, OnRobot, and Schunk

Servo-electric adaptive grippers replaced pneumatics in most cobot and mixed-SKU cells because they carry their own controller, expose force and position over a single cable, and mount as a plug-in on Universal Robots, FANUC CRX, and other cobot arms. Robotiq lists the 2F-85 at 5 kg payload and 85 mm stroke and the 2F-140 at 2.5 kg and 140 mm.

OnRobot markets the RG2 at 2 kg payload with 100 mm stroke and the RG6 at 6 kg with 160 mm, and Schunk EGK and EGH extend the same idea to heavier industrial payloads. Published prices are rare in this segment — most vendors quote through integrators, so treat online figures as list guidance rather than confirmed transaction prices.

Force control is the real reason to spend the extra money. An adaptive gripper can pick a bagged pouch and a rigid casting on the same cycle without a tool change, which is what actually collapses changeover time on a mixed line.

A newer category worth tracking above the standard 2-finger and 3-finger adaptive grippers here: multi-joint dexterous hands trained on human demonstration data, aimed at the fine-motor tasks these grippers still cannot do. See our TactaBot explainer for how that approach differs from a standard adaptive gripper, and why it is not yet a 2026 buying decision. DH-Robotics is another vendor in this space, building electric parallel and rotary grippers alongside a 5-finger dexterous hand aimed at embodied-AI manipulation.

Contact Force Sensing for Closed-Loop Gripping Accuracy

Contact and force sensors improve robotic gripping accuracy by measuring physical resistance at the workpiece boundary. Standard motor encoders only track jaw travel, and positional data alone cannot verify whether an object slipped or started to deform under clamping pressure. Integrators choose between three sensing architectures based on how much measurement detail the job needs.

A single-point pressure sensor is the simplest option. A force-sensing resistor (FSR) uses a piezoresistive conductive polymer that changes electrical resistance in a predictable way as force is applied to its surface, giving a rapid touch trigger at one specific contact point on the jaw face.

A 6-axis force/torque sensor sits between the robot arm’s tool flange and the gripper, and measures force and torque across all six axes at once. Integrators use them across robotic assembly, grinding, polishing, and product testing. Common options include the Robotiq FT 300-S (300 N capacity, 800 N overload rating), the OnRobot HEX-E QC (200 N force, 10 Nm torque), and the ATI Industrial Automation Axia80, an 82 mm-diameter monolithic transducer built on silicon strain gauges.

The Axia80's overload protection runs 5 to 20 times its rated sensing range, so a robot that slams a part into a hard stop is far less likely to destroy the sensor than a unit with a tighter margin. Its dual switchable calibrations let one sensor cover a light-touch task and a heavier clamping task without a hardware swap, and its EtherCAT or Ethernet output means it can usually join the cell's existing network instead of adding a separate signal box.

A tactile sensing array goes further and maps pressure distribution across a grid, using piezoresistive elements that convert mechanical pressure into resistance changes, or a capacitive alternative built the same way. Piezoresistive versions draw less power and hold up to repeated flexing better than some alternatives. Placed directly across the gripping pads, these arrays verify part orientation as well as contact force.

Sensor placement determines what the robot controller can actually detect during a cycle. A flange-mounted sensor measures total external load on the entire tool, but it cannot identify where along the finger pads an object made contact. Fingertip arrays identify that contact point immediately, so the robot controller can ramp down motor current and switch from position tracking to closed-loop force control.

Piezoresistive polymers drift as operating temperatures fluctuate and materials take a cyclic set. Rigid flange units like the IP65-rated Robotiq FT 300-S require no recalibration during their product life, but flexible finger pads demand regular software taring between pick cycles. Digital low-pass filters then strip out ambient mechanical vibrations before the controller calculates contact force.

What we see integrators get wrong most often is validating force thresholds on pristine test stock. Residual cutting oils, casting flash, and ambient dust alter surface friction, so a gripper tuned for clean metal drops greasy production parts during rapid moves. Reliable validation means running the dirtiest, heaviest parts at the edge of dimensional tolerance through full-speed cycle tests.

Adding force sensing brings real integration overhead. For rigid parts with uniform dimensions, a standard pneumatic clamp bottoming against mechanical stops is cheaper and more durable than an instrumented jaw. Reserve tactile arrays and 6-axis sensors for fragile materials, part insertion, and finishing tasks where unmonitored clamping would damage the workpiece.

Vacuum, Magnetic, and Welding End Effectors

Vacuum EOAT dominates palletizing, case handling, and sheet-metal loading. Piab sells the piCOBOT electric-vacuum unit as a cobot-native plug-in, Schmalz supplies the ECBPi and FXCB cobot ranges, and OnRobot VG10 and VGC10 offer configurable cup arrays. Porous cardboard, oily sheet, and irregular texture are the usual reasons a vacuum tool that worked in the demo does not work on the line.

Magnetic grippers matter only when the part is reliably ferrous. Goudsmit MagSystems and similar vendors publish holding-force curves that must be derated for surface finish, air gap, and part thickness. Residual magnetism on the part is the failure that catches new integrators.

Welding torches are their own EOAT category. Fronius Robacta, Abicor Binzel iROB, and Miller AutoAxcess packages include the torch, wire feeder interface, and anti-collision mount as a system — cable dress and tool-center-point (TCP) drift consume more integration hours than the torch selection itself.

• Test the vacuum tool on the worst carton or sheet you actually run, not a clean sample.
• Confirm the cobot controller can drive the EOAT electrically before assuming a plug-in install.
• For magnetic grippers, derate holding force for surface finish and air gap from the vendor curve.
• For welding torches, plan cable dress and anti-collision before choosing the torch model.
• Log air, power, and communication drops per tool so a tool changer can inherit them cleanly.

Industrial Robot Tool Changers: ATI and Schunk

When a cell needs more than one EOAT, an industrial robot tool changer replaces manual swap-out. ATI Industrial Automation and Schunk SWS are the reference vendors, with payload classes from a few kilograms up to hundreds of kilograms and standard modules for pneumatic, electrical, and fieldbus pass-through.

The selection question is not brand — it is payload, moment, required signals, and mating cycles. A changer sized only to the tool weight ignores the moment that a long vacuum array creates at the flange, and a changer without the right fieldbus module forces a control redesign later.

Tool changers pay for themselves when the cell runs at least two tools per shift or one tool that needs regular service off the arm. They rarely pay off in single-tool cells no matter how cheap the mechanical coupling is.